CompareInfo.LastIndexOf CompareInfo.LastIndexOf CompareInfo.LastIndexOf CompareInfo.LastIndexOf Method

Definizione

Restituisce l'indice in base zero dell'ultima occorrenza di un valore all'interno di una stringa o di una parte di essa.Returns the zero-based index of the last occurrence of a value within a string or within a portion of it.

Overload

LastIndexOf(String, Char, Int32, Int32, CompareOptions) LastIndexOf(String, Char, Int32, Int32, CompareOptions) LastIndexOf(String, Char, Int32, Int32, CompareOptions) LastIndexOf(String, Char, Int32, Int32, CompareOptions)

Cerca il carattere specificato e restituisce l'indice in base zero dell'ultima occorrenza all'interno della sezione della stringa di origine che contiene il numero specificato di elementi e termina in corrispondenza dell'indice specificato, usando il valore CompareOptions specificato.Searches for the specified character and returns the zero-based index of the last occurrence within the section of the source string that contains the specified number of elements and ends at the specified index using the specified CompareOptions value.

LastIndexOf(String, String, Int32, Int32) LastIndexOf(String, String, Int32, Int32) LastIndexOf(String, String, Int32, Int32) LastIndexOf(String, String, Int32, Int32)

Cerca la sottostringa specificata e restituisce l'indice in base zero dell'ultima occorrenza all'interno della sezione della stringa di origine che contiene il numero specificato di elementi e termina in corrispondenza dell'indice specificato.Searches for the specified substring and returns the zero-based index of the last occurrence within the section of the source string that contains the specified number of elements and ends at the specified index.

LastIndexOf(String, String, Int32, Int32, CompareOptions) LastIndexOf(String, String, Int32, Int32, CompareOptions) LastIndexOf(String, String, Int32, Int32, CompareOptions) LastIndexOf(String, String, Int32, Int32, CompareOptions)

Cerca la sottostringa specificata e restituisce l'indice in base zero dell'ultima occorrenza all'interno della sezione della stringa di origine che contiene il numero specificato di elementi e termina in corrispondenza dell'indice specificato, usando il valore CompareOptions specificato.Searches for the specified substring and returns the zero-based index of the last occurrence within the section of the source string that contains the specified number of elements and ends at the specified index using the specified CompareOptions value.

LastIndexOf(String, String, Int32, CompareOptions) LastIndexOf(String, String, Int32, CompareOptions) LastIndexOf(String, String, Int32, CompareOptions) LastIndexOf(String, String, Int32, CompareOptions)

Cerca la sottostringa specificata e restituisce l'indice in base zero dell'ultima occorrenza nella sezione della stringa di origine compresa tra l'inizio della stringa e l'indice specificato, usando il valore CompareOptions specificato.Searches for the specified substring and returns the zero-based index of the last occurrence within the section of the source string that extends from the beginning of the string to the specified index using the specified CompareOptions value.

LastIndexOf(String, Char, Int32, Int32) LastIndexOf(String, Char, Int32, Int32) LastIndexOf(String, Char, Int32, Int32) LastIndexOf(String, Char, Int32, Int32)

Cerca il carattere specificato e restituisce l'indice in base zero dell'ultima occorrenza all'interno della sezione della stringa di origine che contiene il numero specificato di elementi e termina in corrispondenza dell'indice specificato.Searches for the specified character and returns the zero-based index of the last occurrence within the section of the source string that contains the specified number of elements and ends at the specified index.

LastIndexOf(String, Char, Int32, CompareOptions) LastIndexOf(String, Char, Int32, CompareOptions) LastIndexOf(String, Char, Int32, CompareOptions) LastIndexOf(String, Char, Int32, CompareOptions)

Cerca il carattere specificato e restituisce l'indice in base zero dell'ultima occorrenza all'interno della sezione della stringa di origine compresa tra l'inizio della stringa e l'indice specificato, usando il valore CompareOptions specificato.Searches for the specified character and returns the zero-based index of the last occurrence within the section of the source string that extends from the beginning of the string to the specified index using the specified CompareOptions value.

LastIndexOf(String, Char, CompareOptions) LastIndexOf(String, Char, CompareOptions) LastIndexOf(String, Char, CompareOptions) LastIndexOf(String, Char, CompareOptions)

Cerca il carattere specificato e restituisce l'indice in base zero dell'ultima occorrenza all'interno dell'intera stringa di origine usando il valore CompareOptions specificato.Searches for the specified character and returns the zero-based index of the last occurrence within the entire source string using the specified CompareOptions value.

LastIndexOf(String, String, CompareOptions) LastIndexOf(String, String, CompareOptions) LastIndexOf(String, String, CompareOptions) LastIndexOf(String, String, CompareOptions)

Cerca la sottostringa specificata e restituisce l'indice in base zero dell'ultima occorrenza all'interno dell'intera stringa di origine usando il valore CompareOptions specificato.Searches for the specified substring and returns the zero-based index of the last occurrence within the entire source string using the specified CompareOptions value.

LastIndexOf(String, Char, Int32) LastIndexOf(String, Char, Int32) LastIndexOf(String, Char, Int32) LastIndexOf(String, Char, Int32)

Cerca il carattere specificato e restituisce l'indice in base zero dell'ultima occorrenza all'interno della sezione della stringa di origine compresa tra l'inizio della stringa e l'indice specificato.Searches for the specified character and returns the zero-based index of the last occurrence within the section of the source string that extends from the beginning of the string to the specified index.

LastIndexOf(String, String) LastIndexOf(String, String) LastIndexOf(String, String) LastIndexOf(String, String)

Cerca la sottostringa specificata e restituisce l'indice in base zero dell'ultima occorrenza all'interno dell'intera stringa di origine.Searches for the specified substring and returns the zero-based index of the last occurrence within the entire source string.

LastIndexOf(String, Char) LastIndexOf(String, Char) LastIndexOf(String, Char) LastIndexOf(String, Char)

Cerca il carattere specificato e restituisce l'indice in base zero dell'ultima occorrenza all'interno dell'intera stringa di origine.Searches for the specified character and returns the zero-based index of the last occurrence within the entire source string.

LastIndexOf(String, String, Int32) LastIndexOf(String, String, Int32) LastIndexOf(String, String, Int32) LastIndexOf(String, String, Int32)

Cerca la sottostringa specificata e restituisce l'indice in base zero dell'ultima occorrenza all'interno della sezione della stringa di origine compresa tra l'inizio della stringa e l'indice specificato.Searches for the specified substring and returns the zero-based index of the last occurrence within the section of the source string that extends from the beginning of the string to the specified index.

LastIndexOf(String, Char, Int32, Int32, CompareOptions) LastIndexOf(String, Char, Int32, Int32, CompareOptions) LastIndexOf(String, Char, Int32, Int32, CompareOptions) LastIndexOf(String, Char, Int32, Int32, CompareOptions)

Cerca il carattere specificato e restituisce l'indice in base zero dell'ultima occorrenza all'interno della sezione della stringa di origine che contiene il numero specificato di elementi e termina in corrispondenza dell'indice specificato, usando il valore CompareOptions specificato.Searches for the specified character and returns the zero-based index of the last occurrence within the section of the source string that contains the specified number of elements and ends at the specified index using the specified CompareOptions value.

public:
 virtual int LastIndexOf(System::String ^ source, char value, int startIndex, int count, System::Globalization::CompareOptions options);
public virtual int LastIndexOf (string source, char value, int startIndex, int count, System.Globalization.CompareOptions options);
abstract member LastIndexOf : string * char * int * int * System.Globalization.CompareOptions -> int
override this.LastIndexOf : string * char * int * int * System.Globalization.CompareOptions -> int
Public Overridable Function LastIndexOf (source As String, value As Char, startIndex As Integer, count As Integer, options As CompareOptions) As Integer

Parametri

source
String String String String

Stringa in cui effettuare la ricerca.The string to search.

value
Char Char Char Char

Carattere da individuare all'interno di source.The character to locate within source.

startIndex
Int32 Int32 Int32 Int32

Indice iniziale in base zero della ricerca all'indietro.The zero-based starting index of the backward search.

count
Int32 Int32 Int32 Int32

Numero di elementi nella sezione in cui eseguire la ricerca.The number of elements in the section to search.

options
CompareOptions CompareOptions CompareOptions CompareOptions

Valore che definisce la modalità di confronto di source e value.A value that defines how source and value should be compared. options è il valore di enumerazione Ordinal o la combinazione bit per bit di uno o più dei seguenti valori: IgnoreCase, IgnoreSymbols, IgnoreNonSpace, IgnoreWidth e IgnoreKanaType.options is either the enumeration value Ordinal, or a bitwise combination of one or more of the following values: IgnoreCase, IgnoreSymbols, IgnoreNonSpace, IgnoreWidth, and IgnoreKanaType.

Restituisce

Indice in base zero dell'ultima occorrenza di value, se presente, all'interno della sezione di source che contiene il numero di elementi specificato da count e termina in corrispondenza di startIndex, usando le opzioni di confronto specificate; in caso contrario, -1.The zero-based index of the last occurrence of value, if found, within the section of source that contains the number of elements specified by count and that ends at startIndex, using the specified comparison options; otherwise, -1. Restituisce startIndex se value è un carattere che è possibile ignorare.Returns startIndex if value is an ignorable character.

Eccezioni

startIndex non è compreso nell'intervallo di indici validi per source.startIndex is outside the range of valid indexes for source.

-oppure--or-

count è minore di zero.count is less than zero.

-oppure--or-

startIndex e count non specificano una sezione valida in source.startIndex and count do not specify a valid section in source.

options contiene un valore di CompareOptions non valido.options contains an invalid CompareOptions value.

Esempi

Nell'esempio seguente vengono determinati gli indici della prima e dell'ultima occorrenza di un carattere o di una sottostringa all'interno di una parte di una stringa.The following example determines the indexes of the first and last occurrences of a character or a substring within a portion of a string.

using namespace System;
using namespace System::Globalization;
void PrintMarker( String^ Prefix, int First, int Last )
{
   
   // Determines the size of the array to create.
   int mySize;
   if ( Last > First )
      mySize = Last;
   else
      mySize = First;

   if ( mySize > -1 )
   {
      
      // Creates an array of Char to hold the markers.
      array<Char>^myCharArr = gcnew array<Char>(mySize + 1);
      
      // Inserts the appropriate markers.
      if ( First > -1 )
            myCharArr[ First ] = 'f';
      if ( Last > -1 )
            myCharArr[ Last ] = 'l';
      if ( First == Last )
            myCharArr[ First ] = 'b';
      
      // Displays the array of Char as a String.
      Console::WriteLine( "{0}{1}", Prefix, gcnew String( myCharArr ) );
   }
   else
      Console::WriteLine( Prefix );
}

int main()
{
   
   // Creates CompareInfo for the InvariantCulture.
   CompareInfo^ myComp = CultureInfo::InvariantCulture->CompareInfo;
   
   // iS is the starting index of the substring.
   int iS = 8;
   
   // iL is the length of the substring.
   int iL = 18;
   
   // myT1 and myT2 are the strings used for padding.
   String^ myT1 = gcnew String( '-',iS );
   String^ myT2;
   
   // Searches for the ligature Æ.
   String^ myStr = "Is AE or ae the same as Æ or æ?";
   myT2 = gcnew String( '-',myStr->Length - iS - iL );
   Console::WriteLine();
   Console::WriteLine( "Original      : {0}", myStr );
   Console::WriteLine( "No options    : {0}{1}{2}", myT1, myStr->Substring( iS, iL ), myT2 );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", iS, iL ), myComp->LastIndexOf( myStr, "AE", iS + iL - 1, iL ) );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", iS, iL ), myComp->LastIndexOf( myStr, "ae", iS + iL - 1, iL ) );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', iS, iL ), myComp->LastIndexOf( myStr, L'Æ', iS + iL - 1, iL ) );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', iS, iL ), myComp->LastIndexOf( myStr, L'æ', iS + iL - 1, iL ) );
   Console::WriteLine( "Ordinal       : {0}{1}{2}", myT1, myStr->Substring( iS, iL ), myT2 );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "AE", iS + iL - 1, iL, CompareOptions::Ordinal ) );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "ae", iS + iL - 1, iL, CompareOptions::Ordinal ) );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'Æ', iS + iL - 1, iL, CompareOptions::Ordinal ) );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'æ', iS + iL - 1, iL, CompareOptions::Ordinal ) );
   Console::WriteLine( "IgnoreCase    : {0}{1}{2}", myT1, myStr->Substring( iS, iL ), myT2 );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "AE", iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "ae", iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'Æ', iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'æ', iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   
   // Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
   myStr = "Is U\u0308 or u\u0308 the same as \u00DC or \u00FC?";
   myT2 = gcnew String( '-',myStr->Length - iS - iL );
   Console::WriteLine();
   Console::WriteLine( "Original      : {0}", myStr );
   Console::WriteLine( "No options    : {0}{1}{2}", myT1, myStr->Substring( iS, iL ), myT2 );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", iS, iL ), myComp->LastIndexOf( myStr, "U\u0308", iS + iL - 1, iL ) );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", iS, iL ), myComp->LastIndexOf( myStr, "u\u0308", iS + iL - 1, iL ) );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', iS, iL ), myComp->LastIndexOf( myStr, L'Ü', iS + iL - 1, iL ) );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', iS, iL ), myComp->LastIndexOf( myStr, L'ü', iS + iL - 1, iL ) );
   Console::WriteLine( "Ordinal       : {0}{1}{2}", myT1, myStr->Substring( iS, iL ), myT2 );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "U\u0308", iS + iL - 1, iL, CompareOptions::Ordinal ) );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "u\u0308", iS + iL - 1, iL, CompareOptions::Ordinal ) );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'Ü', iS + iL - 1, iL, CompareOptions::Ordinal ) );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'ü', iS + iL - 1, iL, CompareOptions::Ordinal ) );
   Console::WriteLine( "IgnoreCase    : {0}{1}{2}", myT1, myStr->Substring( iS, iL ), myT2 );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "U\u0308", iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "u\u0308", iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'Ü', iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'ü', iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
}

/*
This code produces the following output.

Original      : Is AE or ae the same as Æ or æ?
No options    : -------- ae the same as Æ -----
           AE :                         b
           ae :          b
            Æ :                         b
            æ :          b
Ordinal       : -------- ae the same as Æ -----
           AE :
           ae :          b
            Æ :                         b
            æ :
IgnoreCase    : -------- ae the same as Æ -----
           AE :          f              l
           ae :          f              l
            Æ :          f              l
            æ :          f              l

Original      : Is U" or u" the same as Ü or ü?
No options    : -------- u" the same as Ü -----
           U" :                         b
           u" :          b
            Ü :                         b
            ü :          b
Ordinal       : -------- u" the same as Ü -----
           U" :
           u" :          b
            Ü :                         b
            ü :
IgnoreCase    : -------- u" the same as Ü -----
           U" :          f              l
           u" :          f              l
            Ü :          f              l
            ü :          f              l

*/
using System;
using System.Globalization;

public class SamplesCompareInfo  {

   public static void Main()  {

      // Creates CompareInfo for the InvariantCulture.
      CompareInfo myComp = CultureInfo.InvariantCulture.CompareInfo;

      // iS is the starting index of the substring.
      int iS = 8;
      // iL is the length of the substring.
      int iL = 18;
      // myT1 and myT2 are the strings used for padding.
      String myT1 = new String( '-', iS );
      String myT2;

      // Searches for the ligature Æ.
      String myStr = "Is AE or ae the same as Æ or æ?";
      myT2 = new String( '-', myStr.Length - iS - iL );
      Console.WriteLine();
      Console.WriteLine( "Original      : {0}", myStr );
      Console.WriteLine( "No options    : {0}{1}{2}", myT1, myStr.Substring( iS, iL ), myT2 );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", iS, iL ), myComp.LastIndexOf( myStr, "AE", iS + iL - 1, iL ) );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", iS, iL ), myComp.LastIndexOf( myStr, "ae", iS + iL - 1, iL ) );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', iS, iL ), myComp.LastIndexOf( myStr, 'Æ', iS + iL - 1, iL ) );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', iS, iL ), myComp.LastIndexOf( myStr, 'æ', iS + iL - 1, iL ) );
      Console.WriteLine( "Ordinal       : {0}{1}{2}", myT1, myStr.Substring( iS, iL ), myT2 );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "AE", iS + iL - 1, iL, CompareOptions.Ordinal ) );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "ae", iS + iL - 1, iL, CompareOptions.Ordinal ) );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'Æ', iS + iL - 1, iL, CompareOptions.Ordinal ) );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'æ', iS + iL - 1, iL, CompareOptions.Ordinal ) );
      Console.WriteLine( "IgnoreCase    : {0}{1}{2}", myT1, myStr.Substring( iS, iL ), myT2 );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "AE", iS + iL - 1, iL, CompareOptions.IgnoreCase ) );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "ae", iS + iL - 1, iL, CompareOptions.IgnoreCase ) );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'Æ', iS + iL - 1, iL, CompareOptions.IgnoreCase ) );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'æ', iS + iL - 1, iL, CompareOptions.IgnoreCase ) );

      // Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
      myStr = "Is \u0055\u0308 or \u0075\u0308 the same as \u00DC or \u00FC?";
      myT2 = new String( '-', myStr.Length - iS - iL );
      Console.WriteLine();
      Console.WriteLine( "Original      : {0}", myStr );
      Console.WriteLine( "No options    : {0}{1}{2}", myT1, myStr.Substring( iS, iL ), myT2 );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", iS, iL ), myComp.LastIndexOf( myStr, "U\u0308", iS + iL - 1, iL ) );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", iS, iL ), myComp.LastIndexOf( myStr, "u\u0308", iS + iL - 1, iL ) );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', iS, iL ), myComp.LastIndexOf( myStr, 'Ü', iS + iL - 1, iL ) );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', iS, iL ), myComp.LastIndexOf( myStr, 'ü', iS + iL - 1, iL ) );
      Console.WriteLine( "Ordinal       : {0}{1}{2}", myT1, myStr.Substring( iS, iL ), myT2 );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "U\u0308", iS + iL - 1, iL, CompareOptions.Ordinal ) );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "u\u0308", iS + iL - 1, iL, CompareOptions.Ordinal ) );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'Ü', iS + iL - 1, iL, CompareOptions.Ordinal ) );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'ü', iS + iL - 1, iL, CompareOptions.Ordinal ) );
      Console.WriteLine( "IgnoreCase    : {0}{1}{2}", myT1, myStr.Substring( iS, iL ), myT2 );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "U\u0308", iS + iL - 1, iL, CompareOptions.IgnoreCase ) );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "u\u0308", iS + iL - 1, iL, CompareOptions.IgnoreCase ) );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'Ü', iS + iL - 1, iL, CompareOptions.IgnoreCase ) );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'ü', iS + iL - 1, iL, CompareOptions.IgnoreCase ) );

   }

   public static void PrintMarker( String Prefix, int First, int Last )  {

      // Determines the size of the array to create.
      int mySize;
      if ( Last > First )
         mySize = Last;
      else
         mySize = First;

      if ( mySize > -1 )  {

         // Creates an array of Char to hold the markers.
         Char[] myCharArr = new Char[mySize+1];

         // Inserts the appropriate markers.
         if ( First > -1 )
         myCharArr[First] = 'f';
         if ( Last > -1 )
            myCharArr[Last] = 'l';
         if ( First == Last )
         myCharArr[First] = 'b';

         // Displays the array of Char as a String.
         Console.WriteLine( "{0}{1}", Prefix, new String( myCharArr ) );

      }
      else
         Console.WriteLine( Prefix );

   }

}


/*
This code produces the following output.

Original      : Is AE or ae the same as Æ or æ?
No options    : -------- ae the same as Æ -----
           AE :                         b
           ae :          b
            Æ :                         b
            æ :          b
Ordinal       : -------- ae the same as Æ -----
           AE :
           ae :          b
            Æ :                         b
            æ :
IgnoreCase    : -------- ae the same as Æ -----
           AE :          f              l
           ae :          f              l
            Æ :          f              l
            æ :          f              l

Original      : Is U" or u" the same as Ü or ü?
No options    : -------- u" the same as Ü -----
           U" :                         b
           u" :          b
            Ü :                         b
            ü :          b
Ordinal       : -------- u" the same as Ü -----
           U" :
           u" :          b
            Ü :                         b
            ü :
IgnoreCase    : -------- u" the same as Ü -----
           U" :          f              l
           u" :          f              l
            Ü :          f              l
            ü :          f              l

*/
Imports System
Imports System.Globalization
Imports Microsoft.VisualBasic

Public Class SamplesCompareInfo

   Public Shared Sub Main()

      ' Creates CompareInfo for the InvariantCulture.
      Dim myComp As CompareInfo = CultureInfo.InvariantCulture.CompareInfo

      ' iS is the starting index of the substring.
      Dim [iS] As Integer = 8
      ' iL is the length of the substring.
      Dim iL As Integer = 18
      ' myT1 and myT2 are the strings used for padding.
      Dim myT1 As New [String]("-"c, [iS])
      Dim myT2 As [String]

      ' Searches for the ligature Æ.
      Dim myStr As [String] = "Is AE or ae the same as Æ or æ?"
      myT2 = New [String]("-"c, myStr.Length - [iS] - iL)
      Console.WriteLine()
      Console.WriteLine("Original      : {0}", myStr)
      Console.WriteLine("No options    : {0}{1}{2}", myT1, myStr.Substring([iS], iL), myT2)
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", [iS], iL), myComp.LastIndexOf(myStr, "AE", [iS] + iL - 1, iL))
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", [iS], iL), myComp.LastIndexOf(myStr, "ae", [iS] + iL - 1, iL))
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, [iS], iL), myComp.LastIndexOf(myStr, "Æ"c, [iS] + iL - 1, iL))
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, [iS], iL), myComp.LastIndexOf(myStr, "æ"c, [iS] + iL - 1, iL))
      Console.WriteLine("Ordinal       : {0}{1}{2}", myT1, myStr.Substring([iS], iL), myT2)
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "AE", [iS] + iL - 1, iL, CompareOptions.Ordinal))
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "ae", [iS] + iL - 1, iL, CompareOptions.Ordinal))
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "Æ"c, [iS] + iL - 1, iL, CompareOptions.Ordinal))
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "æ"c, [iS] + iL - 1, iL, CompareOptions.Ordinal))
      Console.WriteLine("IgnoreCase    : {0}{1}{2}", myT1, myStr.Substring([iS], iL), myT2)
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "AE", [iS] + iL - 1, iL, CompareOptions.IgnoreCase))
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "ae", [iS] + iL - 1, iL, CompareOptions.IgnoreCase))
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "Æ"c, [iS] + iL - 1, iL, CompareOptions.IgnoreCase))
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "æ"c, [iS] + iL - 1, iL, CompareOptions.IgnoreCase))

      ' Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
      myStr = "Is " & ChrW(&H0055) & ChrW(&H0308) & " or " & ChrW(&H0075) & ChrW(&H0308) & " the same as " & ChrW(&H00DC) & " or " & ChrW(&H00FC) & "?"
      myT2 = New [String]("-"c, myStr.Length - [iS] - iL)
      Console.WriteLine()
      Console.WriteLine("Original      : {0}", myStr)
      Console.WriteLine("No options    : {0}{1}{2}", myT1, myStr.Substring([iS], iL), myT2)
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), [iS], iL), myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), [iS] + iL - 1, iL))
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), [iS], iL), myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), [iS] + iL - 1, iL))
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, [iS], iL), myComp.LastIndexOf(myStr, "Ü"c, [iS] + iL - 1, iL))
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, [iS], iL), myComp.LastIndexOf(myStr, "ü"c, [iS] + iL - 1, iL))
      Console.WriteLine("Ordinal       : {0}{1}{2}", myT1, myStr.Substring([iS], iL), myT2)
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), [iS] + iL - 1, iL, CompareOptions.Ordinal))
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), [iS] + iL - 1, iL, CompareOptions.Ordinal))
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "Ü"c, [iS] + iL - 1, iL, CompareOptions.Ordinal))
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "ü"c, [iS] + iL - 1, iL, CompareOptions.Ordinal))
      Console.WriteLine("IgnoreCase    : {0}{1}{2}", myT1, myStr.Substring([iS], iL), myT2)
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), [iS] + iL - 1, iL, CompareOptions.IgnoreCase))
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), [iS] + iL - 1, iL, CompareOptions.IgnoreCase))
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "Ü"c, [iS] + iL - 1, iL, CompareOptions.IgnoreCase))
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "ü"c, [iS] + iL - 1, iL, CompareOptions.IgnoreCase))

   End Sub 'Main

   Public Shared Sub PrintMarker(Prefix As [String], First As Integer, Last As Integer)

      ' Determines the size of the array to create.
      Dim mySize As Integer
      If Last > First Then
         mySize = Last
      Else
         mySize = First
      End If 

      If mySize > - 1 Then

         ' Creates an array of Char to hold the markers.
         Dim myCharArr(mySize + 1) As [Char]

         ' Inserts the appropriate markers.
         If First > - 1 Then
            myCharArr(First) = "f"c
         End If
         If Last > - 1 Then
            myCharArr(Last) = "l"c
         End If
         If First = Last Then
            myCharArr(First) = "b"c
         End If 

         ' Displays the array of Char as a String.
         Console.WriteLine("{0}{1}", Prefix, New [String](myCharArr))

      Else
         Console.WriteLine(Prefix)

      End If 

   End Sub 'PrintMarker

End Class 'SamplesCompareInfo 


'This code produces the following output.
'
'Original      : Is AE or ae the same as Æ or æ?
'No options    : -------- ae the same as Æ -----
'           AE :                         b
'           ae :          b
'            Æ :                         b
'            æ :          b
'Ordinal       : -------- ae the same as Æ -----
'           AE :
'           ae :          b
'            Æ :                         b
'            æ :
'IgnoreCase    : -------- ae the same as Æ -----
'           AE :          f              l
'           ae :          f              l
'            Æ :          f              l
'            æ :          f              l
'
'Original      : Is U" or u" the same as Ü or ü?
'No options    : -------- u" the same as Ü -----
'           U" :                         b
'           u" :          b
'            Ü :                         b
'            ü :          b
'Ordinal       : -------- u" the same as Ü -----
'           U" :
'           u" :          b
'            Ü :                         b
'            ü :
'IgnoreCase    : -------- u" the same as Ü -----
'           U" :          f              l
'           u" :          f              l
'            Ü :          f              l
'            ü :          f              l

Commenti

La stringa di origine viene cercata all' startIndex indietro a partire startIndex da e termina con - count + 1.The source string is searched backward starting at startIndex and ending at startIndex - count + 1.

Il CompareOptions.StringSort valore non è valido per questo metodo.The CompareOptions.StringSort value is not valid for this method.

Se options non include il Ordinal valore, questo overload esegue una ricerca con distinzione delle impostazioni cultura.If options does not include the Ordinal value, this overload performs a culture-sensitive search. Se il carattere è un valore Unicode che rappresenta un carattere precomposto, ad esempio la legatura "Æ" (U + 00C6), può essere considerato equivalente a qualsiasi occorrenza dei componenti nella sequenza corretta, ad esempio "AE" (U + 0041, U + 0045), a seconda delle impostazioni cultura.If the character is a Unicode value representing a precomposed character, such as the ligature "Æ" (U+00C6), it might be considered equivalent to any occurrence of its components in the correct sequence, such as "AE" (U+0041, U+0045), depending on the culture. Se options include il Ordinal valore, questo overload esegue una ricerca ordinale (indipendente dalle impostazioni cultura).If options includes the Ordinal value, this overload performs an ordinal (culture-insensitive) search. Un carattere viene considerato equivalente a un altro carattere solo se i valori Unicode sono uguali.A character is considered equivalent to another character only if the Unicode values are the same. Gli overload di String.LastIndexOf che cercano un carattere eseguono una ricerca ordinale, mentre quelli che cercano una stringa eseguono una ricerca con distinzione delle impostazioni cultura.Overloads of String.LastIndexOf that search for a character perform an ordinal search, whereas those that search for a string perform a culture-sensitive search.

Nota

Quando possibile, è necessario chiamare i metodi di confronto tra stringhe con un parametro CompareOptions di tipo per specificare il tipo di confronto previsto.When possible, you should call string comparison methods that have a parameter of type CompareOptions to specify the kind of comparison expected. Come regola generale, usare le opzioni linguistiche (usando le impostazioni cultura correnti) per confrontare le stringhe visualizzate nell'interfaccia utente CompareOptions.Ordinal e CompareOptions.OrdinalIgnoreCase specificare o per i confronti di sicurezza.As a general rule, use linguistic options (using the current culture) for comparing strings displayed in the user interface and specify CompareOptions.Ordinal or CompareOptions.OrdinalIgnoreCase for security comparisons.

Note per i chiamanti

I set di caratteri includono caratteri ignorabili, ovvero caratteri che non vengono considerati quando si esegue un ordinamento linguistico o con distinzione delle impostazioni cultura.Character sets include ignorable characters, which are characters that are not considered when performing a linguistic or culture-sensitive sort. In una ricerca dipendente dalle impostazioni cultura, value se è un carattere ignorabile, il risultato è equivalente alla ricerca con il carattere rimosso.In a culture-sensitive search, if value is an ignorable character, the result is equivalent to searching with that character removed. In questo caso, il LastIndexOf(String, Char, Int32, Int32, CompareOptions) metodo restituisce startIndexsempre, ovvero la posizione del carattere in cui inizia la ricerca.In this case, the LastIndexOf(String, Char, Int32, Int32, CompareOptions) method always returns startIndex, which is the character position at which the search begins. Nell'esempio seguente viene usato il LastIndexOf(String, Char, Int32, Int32, CompareOptions) metodo per trovare un segno meno (U + 00AD) che precede la "m" finale in due stringhe.In the following example, the LastIndexOf(String, Char, Int32, Int32, CompareOptions) method is used to find a soft hyphen (U+00AD) that precedes the final "m" in two strings. Solo una delle stringhe contiene un segno meno facoltativo.Only one of the strings contains a soft hyphen. In entrambi i casi, poiché il trattino Soft è un carattere ignorabile, una ricerca con distinzione delle impostazioni cultura restituisce la posizione di indice della "m", che startIndexè il valore di.In both cases, because the soft hyphen is an ignorable character, a culture-sensitive search returns the index position of the "m", which is the value of startIndex. Una ricerca ordinale, tuttavia, trova correttamente il trattino morbido in una stringa e segnala che è assente dalla seconda stringa.An ordinal search, however, successfully finds the soft hyphen in one string and reports that it is absent from the second string.

[!code-csharpSystem.Globalization.CompareInfo.LastIndexOf#12] [!code-vbSystem.Globalization.CompareInfo.LastIndexOf#12][!code-csharpSystem.Globalization.CompareInfo.LastIndexOf#12] [!code-vbSystem.Globalization.CompareInfo.LastIndexOf#12]

Vedi anche

LastIndexOf(String, String, Int32, Int32) LastIndexOf(String, String, Int32, Int32) LastIndexOf(String, String, Int32, Int32) LastIndexOf(String, String, Int32, Int32)

Cerca la sottostringa specificata e restituisce l'indice in base zero dell'ultima occorrenza all'interno della sezione della stringa di origine che contiene il numero specificato di elementi e termina in corrispondenza dell'indice specificato.Searches for the specified substring and returns the zero-based index of the last occurrence within the section of the source string that contains the specified number of elements and ends at the specified index.

public:
 virtual int LastIndexOf(System::String ^ source, System::String ^ value, int startIndex, int count);
public virtual int LastIndexOf (string source, string value, int startIndex, int count);
abstract member LastIndexOf : string * string * int * int -> int
override this.LastIndexOf : string * string * int * int -> int
Public Overridable Function LastIndexOf (source As String, value As String, startIndex As Integer, count As Integer) As Integer

Parametri

source
String String String String

Stringa in cui effettuare la ricerca.The string to search.

value
String String String String

Stringa da individuare all'interno di source.The string to locate within source.

startIndex
Int32 Int32 Int32 Int32

Indice iniziale in base zero della ricerca all'indietro.The zero-based starting index of the backward search.

count
Int32 Int32 Int32 Int32

Numero di elementi nella sezione in cui eseguire la ricerca.The number of elements in the section to search.

Restituisce

Indice in base zero dell'ultima occorrenza di value, se presente, all'interno della sezione di source che contiene il numero di elementi specificato da count e che termina in corrispondenza di startIndex; in caso contrario, -1.The zero-based index of the last occurrence of value, if found, within the section of source that contains the number of elements specified by count and that ends at startIndex; otherwise, -1. Restituisce startIndex se value è un carattere che è possibile ignorare.Returns startIndex if value is an ignorable character.

Eccezioni

source è null.source is null.

-oppure--or-

value è null.value is null.

startIndex non è compreso nell'intervallo di indici validi per source.startIndex is outside the range of valid indexes for source.

In alternativa-or-

count è minore di zero.count is less than zero.

-oppure--or-

startIndex e count non specificano una sezione valida in source.startIndex and count do not specify a valid section in source.

Esempi

Nell'esempio seguente vengono determinati gli indici della prima e dell'ultima occorrenza di un carattere o di una sottostringa all'interno di una parte di una stringa.The following example determines the indexes of the first and last occurrences of a character or a substring within a portion of a string.

using namespace System;
using namespace System::Globalization;
void PrintMarker( String^ Prefix, int First, int Last )
{
   
   // Determines the size of the array to create.
   int mySize;
   if ( Last > First )
      mySize = Last;
   else
      mySize = First;

   if ( mySize > -1 )
   {
      
      // Creates an array of Char to hold the markers.
      array<Char>^myCharArr = gcnew array<Char>(mySize + 1);
      
      // Inserts the appropriate markers.
      if ( First > -1 )
            myCharArr[ First ] = 'f';
      if ( Last > -1 )
            myCharArr[ Last ] = 'l';
      if ( First == Last )
            myCharArr[ First ] = 'b';
      
      // Displays the array of Char as a String.
      Console::WriteLine( "{0}{1}", Prefix, gcnew String( myCharArr ) );
   }
   else
      Console::WriteLine( Prefix );
}

int main()
{
   
   // Creates CompareInfo for the InvariantCulture.
   CompareInfo^ myComp = CultureInfo::InvariantCulture->CompareInfo;
   
   // iS is the starting index of the substring.
   int iS = 8;
   
   // iL is the length of the substring.
   int iL = 18;
   
   // myT1 and myT2 are the strings used for padding.
   String^ myT1 = gcnew String( '-',iS );
   String^ myT2;
   
   // Searches for the ligature Æ.
   String^ myStr = "Is AE or ae the same as Æ or æ?";
   myT2 = gcnew String( '-',myStr->Length - iS - iL );
   Console::WriteLine();
   Console::WriteLine( "Original      : {0}", myStr );
   Console::WriteLine( "No options    : {0}{1}{2}", myT1, myStr->Substring( iS, iL ), myT2 );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", iS, iL ), myComp->LastIndexOf( myStr, "AE", iS + iL - 1, iL ) );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", iS, iL ), myComp->LastIndexOf( myStr, "ae", iS + iL - 1, iL ) );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', iS, iL ), myComp->LastIndexOf( myStr, L'Æ', iS + iL - 1, iL ) );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', iS, iL ), myComp->LastIndexOf( myStr, L'æ', iS + iL - 1, iL ) );
   Console::WriteLine( "Ordinal       : {0}{1}{2}", myT1, myStr->Substring( iS, iL ), myT2 );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "AE", iS + iL - 1, iL, CompareOptions::Ordinal ) );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "ae", iS + iL - 1, iL, CompareOptions::Ordinal ) );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'Æ', iS + iL - 1, iL, CompareOptions::Ordinal ) );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'æ', iS + iL - 1, iL, CompareOptions::Ordinal ) );
   Console::WriteLine( "IgnoreCase    : {0}{1}{2}", myT1, myStr->Substring( iS, iL ), myT2 );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "AE", iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "ae", iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'Æ', iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'æ', iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   
   // Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
   myStr = "Is U\u0308 or u\u0308 the same as \u00DC or \u00FC?";
   myT2 = gcnew String( '-',myStr->Length - iS - iL );
   Console::WriteLine();
   Console::WriteLine( "Original      : {0}", myStr );
   Console::WriteLine( "No options    : {0}{1}{2}", myT1, myStr->Substring( iS, iL ), myT2 );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", iS, iL ), myComp->LastIndexOf( myStr, "U\u0308", iS + iL - 1, iL ) );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", iS, iL ), myComp->LastIndexOf( myStr, "u\u0308", iS + iL - 1, iL ) );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', iS, iL ), myComp->LastIndexOf( myStr, L'Ü', iS + iL - 1, iL ) );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', iS, iL ), myComp->LastIndexOf( myStr, L'ü', iS + iL - 1, iL ) );
   Console::WriteLine( "Ordinal       : {0}{1}{2}", myT1, myStr->Substring( iS, iL ), myT2 );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "U\u0308", iS + iL - 1, iL, CompareOptions::Ordinal ) );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "u\u0308", iS + iL - 1, iL, CompareOptions::Ordinal ) );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'Ü', iS + iL - 1, iL, CompareOptions::Ordinal ) );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'ü', iS + iL - 1, iL, CompareOptions::Ordinal ) );
   Console::WriteLine( "IgnoreCase    : {0}{1}{2}", myT1, myStr->Substring( iS, iL ), myT2 );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "U\u0308", iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "u\u0308", iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'Ü', iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'ü', iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
}

/*
This code produces the following output.

Original      : Is AE or ae the same as Æ or æ?
No options    : -------- ae the same as Æ -----
           AE :                         b
           ae :          b
            Æ :                         b
            æ :          b
Ordinal       : -------- ae the same as Æ -----
           AE :
           ae :          b
            Æ :                         b
            æ :
IgnoreCase    : -------- ae the same as Æ -----
           AE :          f              l
           ae :          f              l
            Æ :          f              l
            æ :          f              l

Original      : Is U" or u" the same as Ü or ü?
No options    : -------- u" the same as Ü -----
           U" :                         b
           u" :          b
            Ü :                         b
            ü :          b
Ordinal       : -------- u" the same as Ü -----
           U" :
           u" :          b
            Ü :                         b
            ü :
IgnoreCase    : -------- u" the same as Ü -----
           U" :          f              l
           u" :          f              l
            Ü :          f              l
            ü :          f              l

*/
using System;
using System.Globalization;

public class SamplesCompareInfo  {

   public static void Main()  {

      // Creates CompareInfo for the InvariantCulture.
      CompareInfo myComp = CultureInfo.InvariantCulture.CompareInfo;

      // iS is the starting index of the substring.
      int iS = 8;
      // iL is the length of the substring.
      int iL = 18;
      // myT1 and myT2 are the strings used for padding.
      String myT1 = new String( '-', iS );
      String myT2;

      // Searches for the ligature Æ.
      String myStr = "Is AE or ae the same as Æ or æ?";
      myT2 = new String( '-', myStr.Length - iS - iL );
      Console.WriteLine();
      Console.WriteLine( "Original      : {0}", myStr );
      Console.WriteLine( "No options    : {0}{1}{2}", myT1, myStr.Substring( iS, iL ), myT2 );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", iS, iL ), myComp.LastIndexOf( myStr, "AE", iS + iL - 1, iL ) );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", iS, iL ), myComp.LastIndexOf( myStr, "ae", iS + iL - 1, iL ) );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', iS, iL ), myComp.LastIndexOf( myStr, 'Æ', iS + iL - 1, iL ) );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', iS, iL ), myComp.LastIndexOf( myStr, 'æ', iS + iL - 1, iL ) );
      Console.WriteLine( "Ordinal       : {0}{1}{2}", myT1, myStr.Substring( iS, iL ), myT2 );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "AE", iS + iL - 1, iL, CompareOptions.Ordinal ) );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "ae", iS + iL - 1, iL, CompareOptions.Ordinal ) );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'Æ', iS + iL - 1, iL, CompareOptions.Ordinal ) );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'æ', iS + iL - 1, iL, CompareOptions.Ordinal ) );
      Console.WriteLine( "IgnoreCase    : {0}{1}{2}", myT1, myStr.Substring( iS, iL ), myT2 );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "AE", iS + iL - 1, iL, CompareOptions.IgnoreCase ) );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "ae", iS + iL - 1, iL, CompareOptions.IgnoreCase ) );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'Æ', iS + iL - 1, iL, CompareOptions.IgnoreCase ) );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'æ', iS + iL - 1, iL, CompareOptions.IgnoreCase ) );

      // Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
      myStr = "Is \u0055\u0308 or \u0075\u0308 the same as \u00DC or \u00FC?";
      myT2 = new String( '-', myStr.Length - iS - iL );
      Console.WriteLine();
      Console.WriteLine( "Original      : {0}", myStr );
      Console.WriteLine( "No options    : {0}{1}{2}", myT1, myStr.Substring( iS, iL ), myT2 );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", iS, iL ), myComp.LastIndexOf( myStr, "U\u0308", iS + iL - 1, iL ) );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", iS, iL ), myComp.LastIndexOf( myStr, "u\u0308", iS + iL - 1, iL ) );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', iS, iL ), myComp.LastIndexOf( myStr, 'Ü', iS + iL - 1, iL ) );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', iS, iL ), myComp.LastIndexOf( myStr, 'ü', iS + iL - 1, iL ) );
      Console.WriteLine( "Ordinal       : {0}{1}{2}", myT1, myStr.Substring( iS, iL ), myT2 );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "U\u0308", iS + iL - 1, iL, CompareOptions.Ordinal ) );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "u\u0308", iS + iL - 1, iL, CompareOptions.Ordinal ) );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'Ü', iS + iL - 1, iL, CompareOptions.Ordinal ) );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'ü', iS + iL - 1, iL, CompareOptions.Ordinal ) );
      Console.WriteLine( "IgnoreCase    : {0}{1}{2}", myT1, myStr.Substring( iS, iL ), myT2 );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "U\u0308", iS + iL - 1, iL, CompareOptions.IgnoreCase ) );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "u\u0308", iS + iL - 1, iL, CompareOptions.IgnoreCase ) );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'Ü', iS + iL - 1, iL, CompareOptions.IgnoreCase ) );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'ü', iS + iL - 1, iL, CompareOptions.IgnoreCase ) );

   }

   public static void PrintMarker( String Prefix, int First, int Last )  {

      // Determines the size of the array to create.
      int mySize;
      if ( Last > First )
         mySize = Last;
      else
         mySize = First;

      if ( mySize > -1 )  {

         // Creates an array of Char to hold the markers.
         Char[] myCharArr = new Char[mySize+1];

         // Inserts the appropriate markers.
         if ( First > -1 )
         myCharArr[First] = 'f';
         if ( Last > -1 )
            myCharArr[Last] = 'l';
         if ( First == Last )
         myCharArr[First] = 'b';

         // Displays the array of Char as a String.
         Console.WriteLine( "{0}{1}", Prefix, new String( myCharArr ) );

      }
      else
         Console.WriteLine( Prefix );

   }

}


/*
This code produces the following output.

Original      : Is AE or ae the same as Æ or æ?
No options    : -------- ae the same as Æ -----
           AE :                         b
           ae :          b
            Æ :                         b
            æ :          b
Ordinal       : -------- ae the same as Æ -----
           AE :
           ae :          b
            Æ :                         b
            æ :
IgnoreCase    : -------- ae the same as Æ -----
           AE :          f              l
           ae :          f              l
            Æ :          f              l
            æ :          f              l

Original      : Is U" or u" the same as Ü or ü?
No options    : -------- u" the same as Ü -----
           U" :                         b
           u" :          b
            Ü :                         b
            ü :          b
Ordinal       : -------- u" the same as Ü -----
           U" :
           u" :          b
            Ü :                         b
            ü :
IgnoreCase    : -------- u" the same as Ü -----
           U" :          f              l
           u" :          f              l
            Ü :          f              l
            ü :          f              l

*/
Imports System
Imports System.Globalization
Imports Microsoft.VisualBasic

Public Class SamplesCompareInfo

   Public Shared Sub Main()

      ' Creates CompareInfo for the InvariantCulture.
      Dim myComp As CompareInfo = CultureInfo.InvariantCulture.CompareInfo

      ' iS is the starting index of the substring.
      Dim [iS] As Integer = 8
      ' iL is the length of the substring.
      Dim iL As Integer = 18
      ' myT1 and myT2 are the strings used for padding.
      Dim myT1 As New [String]("-"c, [iS])
      Dim myT2 As [String]

      ' Searches for the ligature Æ.
      Dim myStr As [String] = "Is AE or ae the same as Æ or æ?"
      myT2 = New [String]("-"c, myStr.Length - [iS] - iL)
      Console.WriteLine()
      Console.WriteLine("Original      : {0}", myStr)
      Console.WriteLine("No options    : {0}{1}{2}", myT1, myStr.Substring([iS], iL), myT2)
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", [iS], iL), myComp.LastIndexOf(myStr, "AE", [iS] + iL - 1, iL))
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", [iS], iL), myComp.LastIndexOf(myStr, "ae", [iS] + iL - 1, iL))
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, [iS], iL), myComp.LastIndexOf(myStr, "Æ"c, [iS] + iL - 1, iL))
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, [iS], iL), myComp.LastIndexOf(myStr, "æ"c, [iS] + iL - 1, iL))
      Console.WriteLine("Ordinal       : {0}{1}{2}", myT1, myStr.Substring([iS], iL), myT2)
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "AE", [iS] + iL - 1, iL, CompareOptions.Ordinal))
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "ae", [iS] + iL - 1, iL, CompareOptions.Ordinal))
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "Æ"c, [iS] + iL - 1, iL, CompareOptions.Ordinal))
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "æ"c, [iS] + iL - 1, iL, CompareOptions.Ordinal))
      Console.WriteLine("IgnoreCase    : {0}{1}{2}", myT1, myStr.Substring([iS], iL), myT2)
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "AE", [iS] + iL - 1, iL, CompareOptions.IgnoreCase))
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "ae", [iS] + iL - 1, iL, CompareOptions.IgnoreCase))
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "Æ"c, [iS] + iL - 1, iL, CompareOptions.IgnoreCase))
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "æ"c, [iS] + iL - 1, iL, CompareOptions.IgnoreCase))

      ' Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
      myStr = "Is " & ChrW(&H0055) & ChrW(&H0308) & " or " & ChrW(&H0075) & ChrW(&H0308) & " the same as " & ChrW(&H00DC) & " or " & ChrW(&H00FC) & "?"
      myT2 = New [String]("-"c, myStr.Length - [iS] - iL)
      Console.WriteLine()
      Console.WriteLine("Original      : {0}", myStr)
      Console.WriteLine("No options    : {0}{1}{2}", myT1, myStr.Substring([iS], iL), myT2)
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), [iS], iL), myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), [iS] + iL - 1, iL))
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), [iS], iL), myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), [iS] + iL - 1, iL))
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, [iS], iL), myComp.LastIndexOf(myStr, "Ü"c, [iS] + iL - 1, iL))
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, [iS], iL), myComp.LastIndexOf(myStr, "ü"c, [iS] + iL - 1, iL))
      Console.WriteLine("Ordinal       : {0}{1}{2}", myT1, myStr.Substring([iS], iL), myT2)
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), [iS] + iL - 1, iL, CompareOptions.Ordinal))
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), [iS] + iL - 1, iL, CompareOptions.Ordinal))
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "Ü"c, [iS] + iL - 1, iL, CompareOptions.Ordinal))
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "ü"c, [iS] + iL - 1, iL, CompareOptions.Ordinal))
      Console.WriteLine("IgnoreCase    : {0}{1}{2}", myT1, myStr.Substring([iS], iL), myT2)
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), [iS] + iL - 1, iL, CompareOptions.IgnoreCase))
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), [iS] + iL - 1, iL, CompareOptions.IgnoreCase))
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "Ü"c, [iS] + iL - 1, iL, CompareOptions.IgnoreCase))
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "ü"c, [iS] + iL - 1, iL, CompareOptions.IgnoreCase))

   End Sub 'Main

   Public Shared Sub PrintMarker(Prefix As [String], First As Integer, Last As Integer)

      ' Determines the size of the array to create.
      Dim mySize As Integer
      If Last > First Then
         mySize = Last
      Else
         mySize = First
      End If 

      If mySize > - 1 Then

         ' Creates an array of Char to hold the markers.
         Dim myCharArr(mySize + 1) As [Char]

         ' Inserts the appropriate markers.
         If First > - 1 Then
            myCharArr(First) = "f"c
         End If
         If Last > - 1 Then
            myCharArr(Last) = "l"c
         End If
         If First = Last Then
            myCharArr(First) = "b"c
         End If 

         ' Displays the array of Char as a String.
         Console.WriteLine("{0}{1}", Prefix, New [String](myCharArr))

      Else
         Console.WriteLine(Prefix)

      End If 

   End Sub 'PrintMarker

End Class 'SamplesCompareInfo 


'This code produces the following output.
'
'Original      : Is AE or ae the same as Æ or æ?
'No options    : -------- ae the same as Æ -----
'           AE :                         b
'           ae :          b
'            Æ :                         b
'            æ :          b
'Ordinal       : -------- ae the same as Æ -----
'           AE :
'           ae :          b
'            Æ :                         b
'            æ :
'IgnoreCase    : -------- ae the same as Æ -----
'           AE :          f              l
'           ae :          f              l
'            Æ :          f              l
'            æ :          f              l
'
'Original      : Is U" or u" the same as Ü or ü?
'No options    : -------- u" the same as Ü -----
'           U" :                         b
'           u" :          b
'            Ü :                         b
'            ü :          b
'Ordinal       : -------- u" the same as Ü -----
'           U" :
'           u" :          b
'            Ü :                         b
'            ü :
'IgnoreCase    : -------- u" the same as Ü -----
'           U" :          f              l
'           u" :          f              l
'            Ü :          f              l
'            ü :          f              l

Commenti

La stringa di origine viene cercata all' startIndex indietro a partire startIndex da e termina con - count + 1.The source string is searched backward starting at startIndex and ending at startIndex - count + 1.

Questo overload esegue una ricerca con distinzione delle impostazioni cultura.This overload performs a culture-sensitive search. Un valore Unicode che rappresenta un carattere precomposto, ad esempio la legatura "Æ" (U + 00C6), può essere considerato equivalente a qualsiasi occorrenza dei componenti del carattere nella sequenza corretta, ad esempio "AE" (U + 0041, U + 0045), a seconda delle impostazioni cultura.A Unicode value representing a precomposed character, such as the ligature "Æ" (U+00C6), might be considered equivalent to any occurrence of the character's components in the correct sequence, such as "AE" (U+0041, U+0045), depending on the culture. Per eseguire una ricerca ordinale (indipendente dalle impostazioni cultura), in cui vengono confrontati i valori Unicode, è necessario chiamare uno degli overload con un parametro di tipo CompareOptions e usare il Ordinal valore.To perform an ordinal (culture-insensitive) search, where the Unicode values are compared, you should call one of the overloads that has a parameter of type CompareOptions and use the Ordinal value.

Nota

Quando possibile, è necessario chiamare i metodi di confronto tra stringhe con un parametro CompareOptions di tipo per specificare il tipo di confronto previsto.When possible, you should call string comparison methods that have a parameter of type CompareOptions to specify the kind of comparison expected. Come regola generale, usare le opzioni linguistiche (usando le impostazioni cultura correnti) per confrontare le stringhe visualizzate nell'interfaccia utente CompareOptions.Ordinal e CompareOptions.OrdinalIgnoreCase specificare o per i confronti di sicurezza.As a general rule, use linguistic options (using the current culture) for comparing strings displayed in the user interface and specify CompareOptions.Ordinal or CompareOptions.OrdinalIgnoreCase for security comparisons .

Note per i chiamanti

I set di caratteri includono caratteri ignorabili, ovvero caratteri che non vengono considerati quando si esegue un ordinamento linguistico o con distinzione delle impostazioni cultura.Character sets include ignorable characters, which are characters that are not considered when performing a linguistic or culture-sensitive sort. In una ricerca dipendente dalle impostazioni cultura, se value contiene un carattere ignorabile, il risultato è equivalente alla ricerca con il carattere rimosso.In a culture-sensitive search, if value contains an ignorable character, the result is equivalent to searching with that character removed. Se value è costituito solo da uno o più caratteri ignorabili LastIndexOf(String, String, Int32, Int32) , il metodo startIndexrestituisce sempre, ovvero la posizione del carattere in corrispondenza della quale ha inizio la ricerca.If value consists only of one or more ignorable characters, the LastIndexOf(String, String, Int32, Int32) method always returns startIndex, which is the character position at which the search begins.

Nell'esempio seguente viene usato il LastIndexOf(String, String, Int32, Int32) metodo per trovare la posizione di un trattino (U + 00AD) seguito da una "m" nei tre caratteri che precede la "m" finale di due stringhe.In the following example, the LastIndexOf(String, String, Int32, Int32) method is used to find the position of a soft hyphen (U+00AD) followed by an "m" in the three characters that precede the final "m" of two strings. Solo una delle stringhe contiene la sottostringa richiesta.Only one of the strings contains the required substring. In entrambi i casi, poiché il segno meno facoltativo è un carattere ignorabile, il metodo restituisce l'indice di "m" nella stringa quando viene eseguito un confronto dipendente dalle impostazioni cultura.In both cases, because the soft hyphen is an ignorable character, the method returns the index of "m" in the string when it performs a culture-sensitive comparison. Si noti che nel caso della prima stringa, che include il segno meno facoltativo seguito da una "m", il metodo non restituisce l'indice del segno meno facoltativo, ma l'indice di "m".Note that in the case of the first string, which includes the soft hyphen followed by an "m", the method fails to return the index of the soft hyphen but instead returns the index of the "m".

[!code-csharpSystem.Globalization.CompareInfo.LastIndexOf#17] [!code-vbSystem.Globalization.CompareInfo.LastIndexOf#17][!code-csharpSystem.Globalization.CompareInfo.LastIndexOf#17] [!code-vbSystem.Globalization.CompareInfo.LastIndexOf#17]

Vedi anche

LastIndexOf(String, String, Int32, Int32, CompareOptions) LastIndexOf(String, String, Int32, Int32, CompareOptions) LastIndexOf(String, String, Int32, Int32, CompareOptions) LastIndexOf(String, String, Int32, Int32, CompareOptions)

Cerca la sottostringa specificata e restituisce l'indice in base zero dell'ultima occorrenza all'interno della sezione della stringa di origine che contiene il numero specificato di elementi e termina in corrispondenza dell'indice specificato, usando il valore CompareOptions specificato.Searches for the specified substring and returns the zero-based index of the last occurrence within the section of the source string that contains the specified number of elements and ends at the specified index using the specified CompareOptions value.

public:
 virtual int LastIndexOf(System::String ^ source, System::String ^ value, int startIndex, int count, System::Globalization::CompareOptions options);
public virtual int LastIndexOf (string source, string value, int startIndex, int count, System.Globalization.CompareOptions options);
abstract member LastIndexOf : string * string * int * int * System.Globalization.CompareOptions -> int
override this.LastIndexOf : string * string * int * int * System.Globalization.CompareOptions -> int
Public Overridable Function LastIndexOf (source As String, value As String, startIndex As Integer, count As Integer, options As CompareOptions) As Integer

Parametri

source
String String String String

Stringa in cui effettuare la ricerca.The string to search.

value
String String String String

Stringa da individuare all'interno di source.The string to locate within source.

startIndex
Int32 Int32 Int32 Int32

Indice iniziale in base zero della ricerca all'indietro.The zero-based starting index of the backward search.

count
Int32 Int32 Int32 Int32

Numero di elementi nella sezione in cui eseguire la ricerca.The number of elements in the section to search.

options
CompareOptions CompareOptions CompareOptions CompareOptions

Valore che definisce la modalità di confronto di source e value.A value that defines how source and value should be compared. options è il valore di enumerazione Ordinal o la combinazione bit per bit di uno o più dei seguenti valori: IgnoreCase, IgnoreSymbols, IgnoreNonSpace, IgnoreWidth e IgnoreKanaType.options is either the enumeration value Ordinal, or a bitwise combination of one or more of the following values: IgnoreCase, IgnoreSymbols, IgnoreNonSpace, IgnoreWidth, and IgnoreKanaType.

Restituisce

Indice in base zero dell'ultima occorrenza di value, se presente, all'interno della sezione di source che contiene il numero di elementi specificato da count e termina in corrispondenza di startIndex, usando le opzioni di confronto specificate; in caso contrario, -1.The zero-based index of the last occurrence of value, if found, within the section of source that contains the number of elements specified by count and that ends at startIndex, using the specified comparison options; otherwise, -1. Restituisce startIndex se value è un carattere che è possibile ignorare.Returns startIndex if value is an ignorable character.

Eccezioni

source è null.source is null.

-oppure--or-

value è null.value is null.

startIndex non è compreso nell'intervallo di indici validi per source.startIndex is outside the range of valid indexes for source.

-oppure--or-

count è minore di zero.count is less than zero.

-oppure--or-

startIndex e count non specificano una sezione valida in source.startIndex and count do not specify a valid section in source.

options contiene un valore di CompareOptions non valido.options contains an invalid CompareOptions value.

Esempi

Nell'esempio seguente vengono determinati gli indici della prima e dell'ultima occorrenza di un carattere o di una sottostringa all'interno di una parte di una stringa.The following example determines the indexes of the first and last occurrences of a character or a substring within a portion of a string.

using namespace System;
using namespace System::Globalization;
void PrintMarker( String^ Prefix, int First, int Last )
{
   
   // Determines the size of the array to create.
   int mySize;
   if ( Last > First )
      mySize = Last;
   else
      mySize = First;

   if ( mySize > -1 )
   {
      
      // Creates an array of Char to hold the markers.
      array<Char>^myCharArr = gcnew array<Char>(mySize + 1);
      
      // Inserts the appropriate markers.
      if ( First > -1 )
            myCharArr[ First ] = 'f';
      if ( Last > -1 )
            myCharArr[ Last ] = 'l';
      if ( First == Last )
            myCharArr[ First ] = 'b';
      
      // Displays the array of Char as a String.
      Console::WriteLine( "{0}{1}", Prefix, gcnew String( myCharArr ) );
   }
   else
      Console::WriteLine( Prefix );
}

int main()
{
   
   // Creates CompareInfo for the InvariantCulture.
   CompareInfo^ myComp = CultureInfo::InvariantCulture->CompareInfo;
   
   // iS is the starting index of the substring.
   int iS = 8;
   
   // iL is the length of the substring.
   int iL = 18;
   
   // myT1 and myT2 are the strings used for padding.
   String^ myT1 = gcnew String( '-',iS );
   String^ myT2;
   
   // Searches for the ligature Æ.
   String^ myStr = "Is AE or ae the same as Æ or æ?";
   myT2 = gcnew String( '-',myStr->Length - iS - iL );
   Console::WriteLine();
   Console::WriteLine( "Original      : {0}", myStr );
   Console::WriteLine( "No options    : {0}{1}{2}", myT1, myStr->Substring( iS, iL ), myT2 );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", iS, iL ), myComp->LastIndexOf( myStr, "AE", iS + iL - 1, iL ) );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", iS, iL ), myComp->LastIndexOf( myStr, "ae", iS + iL - 1, iL ) );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', iS, iL ), myComp->LastIndexOf( myStr, L'Æ', iS + iL - 1, iL ) );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', iS, iL ), myComp->LastIndexOf( myStr, L'æ', iS + iL - 1, iL ) );
   Console::WriteLine( "Ordinal       : {0}{1}{2}", myT1, myStr->Substring( iS, iL ), myT2 );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "AE", iS + iL - 1, iL, CompareOptions::Ordinal ) );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "ae", iS + iL - 1, iL, CompareOptions::Ordinal ) );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'Æ', iS + iL - 1, iL, CompareOptions::Ordinal ) );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'æ', iS + iL - 1, iL, CompareOptions::Ordinal ) );
   Console::WriteLine( "IgnoreCase    : {0}{1}{2}", myT1, myStr->Substring( iS, iL ), myT2 );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "AE", iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "ae", iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'Æ', iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'æ', iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   
   // Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
   myStr = "Is U\u0308 or u\u0308 the same as \u00DC or \u00FC?";
   myT2 = gcnew String( '-',myStr->Length - iS - iL );
   Console::WriteLine();
   Console::WriteLine( "Original      : {0}", myStr );
   Console::WriteLine( "No options    : {0}{1}{2}", myT1, myStr->Substring( iS, iL ), myT2 );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", iS, iL ), myComp->LastIndexOf( myStr, "U\u0308", iS + iL - 1, iL ) );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", iS, iL ), myComp->LastIndexOf( myStr, "u\u0308", iS + iL - 1, iL ) );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', iS, iL ), myComp->LastIndexOf( myStr, L'Ü', iS + iL - 1, iL ) );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', iS, iL ), myComp->LastIndexOf( myStr, L'ü', iS + iL - 1, iL ) );
   Console::WriteLine( "Ordinal       : {0}{1}{2}", myT1, myStr->Substring( iS, iL ), myT2 );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "U\u0308", iS + iL - 1, iL, CompareOptions::Ordinal ) );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "u\u0308", iS + iL - 1, iL, CompareOptions::Ordinal ) );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'Ü', iS + iL - 1, iL, CompareOptions::Ordinal ) );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'ü', iS + iL - 1, iL, CompareOptions::Ordinal ) );
   Console::WriteLine( "IgnoreCase    : {0}{1}{2}", myT1, myStr->Substring( iS, iL ), myT2 );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "U\u0308", iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "u\u0308", iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'Ü', iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'ü', iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
}

/*
This code produces the following output.

Original      : Is AE or ae the same as Æ or æ?
No options    : -------- ae the same as Æ -----
           AE :                         b
           ae :          b
            Æ :                         b
            æ :          b
Ordinal       : -------- ae the same as Æ -----
           AE :
           ae :          b
            Æ :                         b
            æ :
IgnoreCase    : -------- ae the same as Æ -----
           AE :          f              l
           ae :          f              l
            Æ :          f              l
            æ :          f              l

Original      : Is U" or u" the same as Ü or ü?
No options    : -------- u" the same as Ü -----
           U" :                         b
           u" :          b
            Ü :                         b
            ü :          b
Ordinal       : -------- u" the same as Ü -----
           U" :
           u" :          b
            Ü :                         b
            ü :
IgnoreCase    : -------- u" the same as Ü -----
           U" :          f              l
           u" :          f              l
            Ü :          f              l
            ü :          f              l

*/
using System;
using System.Globalization;

public class SamplesCompareInfo  {

   public static void Main()  {

      // Creates CompareInfo for the InvariantCulture.
      CompareInfo myComp = CultureInfo.InvariantCulture.CompareInfo;

      // iS is the starting index of the substring.
      int iS = 8;
      // iL is the length of the substring.
      int iL = 18;
      // myT1 and myT2 are the strings used for padding.
      String myT1 = new String( '-', iS );
      String myT2;

      // Searches for the ligature Æ.
      String myStr = "Is AE or ae the same as Æ or æ?";
      myT2 = new String( '-', myStr.Length - iS - iL );
      Console.WriteLine();
      Console.WriteLine( "Original      : {0}", myStr );
      Console.WriteLine( "No options    : {0}{1}{2}", myT1, myStr.Substring( iS, iL ), myT2 );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", iS, iL ), myComp.LastIndexOf( myStr, "AE", iS + iL - 1, iL ) );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", iS, iL ), myComp.LastIndexOf( myStr, "ae", iS + iL - 1, iL ) );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', iS, iL ), myComp.LastIndexOf( myStr, 'Æ', iS + iL - 1, iL ) );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', iS, iL ), myComp.LastIndexOf( myStr, 'æ', iS + iL - 1, iL ) );
      Console.WriteLine( "Ordinal       : {0}{1}{2}", myT1, myStr.Substring( iS, iL ), myT2 );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "AE", iS + iL - 1, iL, CompareOptions.Ordinal ) );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "ae", iS + iL - 1, iL, CompareOptions.Ordinal ) );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'Æ', iS + iL - 1, iL, CompareOptions.Ordinal ) );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'æ', iS + iL - 1, iL, CompareOptions.Ordinal ) );
      Console.WriteLine( "IgnoreCase    : {0}{1}{2}", myT1, myStr.Substring( iS, iL ), myT2 );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "AE", iS + iL - 1, iL, CompareOptions.IgnoreCase ) );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "ae", iS + iL - 1, iL, CompareOptions.IgnoreCase ) );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'Æ', iS + iL - 1, iL, CompareOptions.IgnoreCase ) );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'æ', iS + iL - 1, iL, CompareOptions.IgnoreCase ) );

      // Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
      myStr = "Is \u0055\u0308 or \u0075\u0308 the same as \u00DC or \u00FC?";
      myT2 = new String( '-', myStr.Length - iS - iL );
      Console.WriteLine();
      Console.WriteLine( "Original      : {0}", myStr );
      Console.WriteLine( "No options    : {0}{1}{2}", myT1, myStr.Substring( iS, iL ), myT2 );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", iS, iL ), myComp.LastIndexOf( myStr, "U\u0308", iS + iL - 1, iL ) );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", iS, iL ), myComp.LastIndexOf( myStr, "u\u0308", iS + iL - 1, iL ) );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', iS, iL ), myComp.LastIndexOf( myStr, 'Ü', iS + iL - 1, iL ) );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', iS, iL ), myComp.LastIndexOf( myStr, 'ü', iS + iL - 1, iL ) );
      Console.WriteLine( "Ordinal       : {0}{1}{2}", myT1, myStr.Substring( iS, iL ), myT2 );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "U\u0308", iS + iL - 1, iL, CompareOptions.Ordinal ) );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "u\u0308", iS + iL - 1, iL, CompareOptions.Ordinal ) );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'Ü', iS + iL - 1, iL, CompareOptions.Ordinal ) );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'ü', iS + iL - 1, iL, CompareOptions.Ordinal ) );
      Console.WriteLine( "IgnoreCase    : {0}{1}{2}", myT1, myStr.Substring( iS, iL ), myT2 );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "U\u0308", iS + iL - 1, iL, CompareOptions.IgnoreCase ) );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "u\u0308", iS + iL - 1, iL, CompareOptions.IgnoreCase ) );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'Ü', iS + iL - 1, iL, CompareOptions.IgnoreCase ) );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'ü', iS + iL - 1, iL, CompareOptions.IgnoreCase ) );

   }

   public static void PrintMarker( String Prefix, int First, int Last )  {

      // Determines the size of the array to create.
      int mySize;
      if ( Last > First )
         mySize = Last;
      else
         mySize = First;

      if ( mySize > -1 )  {

         // Creates an array of Char to hold the markers.
         Char[] myCharArr = new Char[mySize+1];

         // Inserts the appropriate markers.
         if ( First > -1 )
         myCharArr[First] = 'f';
         if ( Last > -1 )
            myCharArr[Last] = 'l';
         if ( First == Last )
         myCharArr[First] = 'b';

         // Displays the array of Char as a String.
         Console.WriteLine( "{0}{1}", Prefix, new String( myCharArr ) );

      }
      else
         Console.WriteLine( Prefix );

   }

}


/*
This code produces the following output.

Original      : Is AE or ae the same as Æ or æ?
No options    : -------- ae the same as Æ -----
           AE :                         b
           ae :          b
            Æ :                         b
            æ :          b
Ordinal       : -------- ae the same as Æ -----
           AE :
           ae :          b
            Æ :                         b
            æ :
IgnoreCase    : -------- ae the same as Æ -----
           AE :          f              l
           ae :          f              l
            Æ :          f              l
            æ :          f              l

Original      : Is U" or u" the same as Ü or ü?
No options    : -------- u" the same as Ü -----
           U" :                         b
           u" :          b
            Ü :                         b
            ü :          b
Ordinal       : -------- u" the same as Ü -----
           U" :
           u" :          b
            Ü :                         b
            ü :
IgnoreCase    : -------- u" the same as Ü -----
           U" :          f              l
           u" :          f              l
            Ü :          f              l
            ü :          f              l

*/
Imports System
Imports System.Globalization
Imports Microsoft.VisualBasic

Public Class SamplesCompareInfo

   Public Shared Sub Main()

      ' Creates CompareInfo for the InvariantCulture.
      Dim myComp As CompareInfo = CultureInfo.InvariantCulture.CompareInfo

      ' iS is the starting index of the substring.
      Dim [iS] As Integer = 8
      ' iL is the length of the substring.
      Dim iL As Integer = 18
      ' myT1 and myT2 are the strings used for padding.
      Dim myT1 As New [String]("-"c, [iS])
      Dim myT2 As [String]

      ' Searches for the ligature Æ.
      Dim myStr As [String] = "Is AE or ae the same as Æ or æ?"
      myT2 = New [String]("-"c, myStr.Length - [iS] - iL)
      Console.WriteLine()
      Console.WriteLine("Original      : {0}", myStr)
      Console.WriteLine("No options    : {0}{1}{2}", myT1, myStr.Substring([iS], iL), myT2)
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", [iS], iL), myComp.LastIndexOf(myStr, "AE", [iS] + iL - 1, iL))
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", [iS], iL), myComp.LastIndexOf(myStr, "ae", [iS] + iL - 1, iL))
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, [iS], iL), myComp.LastIndexOf(myStr, "Æ"c, [iS] + iL - 1, iL))
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, [iS], iL), myComp.LastIndexOf(myStr, "æ"c, [iS] + iL - 1, iL))
      Console.WriteLine("Ordinal       : {0}{1}{2}", myT1, myStr.Substring([iS], iL), myT2)
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "AE", [iS] + iL - 1, iL, CompareOptions.Ordinal))
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "ae", [iS] + iL - 1, iL, CompareOptions.Ordinal))
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "Æ"c, [iS] + iL - 1, iL, CompareOptions.Ordinal))
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "æ"c, [iS] + iL - 1, iL, CompareOptions.Ordinal))
      Console.WriteLine("IgnoreCase    : {0}{1}{2}", myT1, myStr.Substring([iS], iL), myT2)
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "AE", [iS] + iL - 1, iL, CompareOptions.IgnoreCase))
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "ae", [iS] + iL - 1, iL, CompareOptions.IgnoreCase))
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "Æ"c, [iS] + iL - 1, iL, CompareOptions.IgnoreCase))
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "æ"c, [iS] + iL - 1, iL, CompareOptions.IgnoreCase))

      ' Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
      myStr = "Is " & ChrW(&H0055) & ChrW(&H0308) & " or " & ChrW(&H0075) & ChrW(&H0308) & " the same as " & ChrW(&H00DC) & " or " & ChrW(&H00FC) & "?"
      myT2 = New [String]("-"c, myStr.Length - [iS] - iL)
      Console.WriteLine()
      Console.WriteLine("Original      : {0}", myStr)
      Console.WriteLine("No options    : {0}{1}{2}", myT1, myStr.Substring([iS], iL), myT2)
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), [iS], iL), myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), [iS] + iL - 1, iL))
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), [iS], iL), myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), [iS] + iL - 1, iL))
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, [iS], iL), myComp.LastIndexOf(myStr, "Ü"c, [iS] + iL - 1, iL))
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, [iS], iL), myComp.LastIndexOf(myStr, "ü"c, [iS] + iL - 1, iL))
      Console.WriteLine("Ordinal       : {0}{1}{2}", myT1, myStr.Substring([iS], iL), myT2)
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), [iS] + iL - 1, iL, CompareOptions.Ordinal))
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), [iS] + iL - 1, iL, CompareOptions.Ordinal))
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "Ü"c, [iS] + iL - 1, iL, CompareOptions.Ordinal))
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "ü"c, [iS] + iL - 1, iL, CompareOptions.Ordinal))
      Console.WriteLine("IgnoreCase    : {0}{1}{2}", myT1, myStr.Substring([iS], iL), myT2)
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), [iS] + iL - 1, iL, CompareOptions.IgnoreCase))
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), [iS] + iL - 1, iL, CompareOptions.IgnoreCase))
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "Ü"c, [iS] + iL - 1, iL, CompareOptions.IgnoreCase))
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "ü"c, [iS] + iL - 1, iL, CompareOptions.IgnoreCase))

   End Sub 'Main

   Public Shared Sub PrintMarker(Prefix As [String], First As Integer, Last As Integer)

      ' Determines the size of the array to create.
      Dim mySize As Integer
      If Last > First Then
         mySize = Last
      Else
         mySize = First
      End If 

      If mySize > - 1 Then

         ' Creates an array of Char to hold the markers.
         Dim myCharArr(mySize + 1) As [Char]

         ' Inserts the appropriate markers.
         If First > - 1 Then
            myCharArr(First) = "f"c
         End If
         If Last > - 1 Then
            myCharArr(Last) = "l"c
         End If
         If First = Last Then
            myCharArr(First) = "b"c
         End If 

         ' Displays the array of Char as a String.
         Console.WriteLine("{0}{1}", Prefix, New [String](myCharArr))

      Else
         Console.WriteLine(Prefix)

      End If 

   End Sub 'PrintMarker

End Class 'SamplesCompareInfo 


'This code produces the following output.
'
'Original      : Is AE or ae the same as Æ or æ?
'No options    : -------- ae the same as Æ -----
'           AE :                         b
'           ae :          b
'            Æ :                         b
'            æ :          b
'Ordinal       : -------- ae the same as Æ -----
'           AE :
'           ae :          b
'            Æ :                         b
'            æ :
'IgnoreCase    : -------- ae the same as Æ -----
'           AE :          f              l
'           ae :          f              l
'            Æ :          f              l
'            æ :          f              l
'
'Original      : Is U" or u" the same as Ü or ü?
'No options    : -------- u" the same as Ü -----
'           U" :                         b
'           u" :          b
'            Ü :                         b
'            ü :          b
'Ordinal       : -------- u" the same as Ü -----
'           U" :
'           u" :          b
'            Ü :                         b
'            ü :
'IgnoreCase    : -------- u" the same as Ü -----
'           U" :          f              l
'           u" :          f              l
'            Ü :          f              l
'            ü :          f              l

Commenti

La stringa di origine viene cercata all' startIndex indietro a partire startIndex da e termina con - count + 1.The source string is searched backward starting at startIndex and ending at startIndex - count + 1.

Il CompareOptions.StringSort valore non è valido per questo metodo.The CompareOptions.StringSort value is not valid for this method.

Se options non include il Ordinal valore, questo overload esegue una ricerca con distinzione delle impostazioni cultura.If options does not include the Ordinal value, this overload performs a culture-sensitive search. Un valore Unicode che rappresenta un carattere precomposto, ad esempio la legatura "Æ" (U + 00C6), può essere considerato equivalente a qualsiasi occorrenza dei componenti del carattere nella sequenza corretta, ad esempio "AE" (U + 0041, U + 0045), a seconda delle impostazioni cultura.A Unicode value representing a precomposed character, such as the ligature "Æ" (U+00C6), might be considered equivalent to any occurrence of the character's components in the correct sequence, such as "AE" (U+0041, U+0045), depending on the culture. Se options include il Ordinal valore, questo overload esegue una ricerca ordinale (indipendente dalle impostazioni cultura), in cui vengono confrontati i valori Unicode.If options includes the Ordinal value, this overload performs an ordinal (culture-insensitive) search, where the Unicode values are compared.

Nota

Quando possibile, è necessario chiamare i metodi di confronto tra stringhe con un parametro CompareOptions di tipo per specificare il tipo di confronto previsto.When possible, you should call string comparison methods that have a parameter of type CompareOptions to specify the kind of comparison expected. Come regola generale, usare le opzioni linguistiche (usando le impostazioni cultura correnti) per confrontare le stringhe visualizzate nell'interfaccia utente CompareOptions.Ordinal e CompareOptions.OrdinalIgnoreCase specificare o per i confronti di sicurezza.As a general rule, use linguistic options (using the current culture) for comparing strings displayed in the user interface and specify CompareOptions.Ordinal or CompareOptions.OrdinalIgnoreCase for security comparisons.

Note per i chiamanti

I set di caratteri includono caratteri ignorabili, ovvero caratteri che non vengono considerati quando si esegue un ordinamento linguistico o con distinzione delle impostazioni cultura.Character sets include ignorable characters, which are characters that are not considered when performing a linguistic or culture-sensitive sort. In una ricerca dipendente dalle impostazioni cultura (ovvero se options non è Ordinal o OrdinalIgnoreCase), se value contiene un carattere ignorable, il risultato è equivalente alla ricerca con il carattere rimosso.In a culture-sensitive search (that is, if options is not Ordinal or OrdinalIgnoreCase), if value contains an ignorable character, the result is equivalent to searching with that character removed. Se value è costituito solo da uno o più caratteri ignorabili LastIndexOf(String, String, Int32, Int32, CompareOptions) , il metodo startIndexrestituisce sempre, ovvero la posizione del carattere in corrispondenza della quale ha inizio la ricerca.If value consists only of one or more ignorable characters, the LastIndexOf(String, String, Int32, Int32, CompareOptions) method always returns startIndex, which is the character position at which the search begins.

Nell'esempio seguente viene usato il LastIndexOf(String, String, Int32, Int32, CompareOptions) metodo per trovare la posizione di un trattino (U + 00AD) seguito da un carattere "m" in tutte le posizioni, ma prima della "m" finale in due stringhe.In the following example, the LastIndexOf(String, String, Int32, Int32, CompareOptions) method is used to find the position of a soft hyphen (U+00AD) followed by an "m" in all but the first character position before the final "m" in two strings. Solo una delle stringhe contiene la sottostringa richiesta.Only one of the strings contains the required substring. In entrambi i casi, poiché il segno meno facoltativo è un carattere ignorabile, il metodo restituisce l'indice di "m" nella stringa quando viene eseguito un confronto dipendente dalle impostazioni cultura.In both cases, because the soft hyphen is an ignorable character, the method returns the index of "m" in the string when it performs a culture-sensitive comparison. Quando esegue un confronto ordinale, tuttavia, trova la sottostringa solo nella prima stringa.When it performs an ordinal comparison, however, it finds the substring only in the first string. Si noti che nel caso della prima stringa, che include il trattino morbido seguito da un "m", il metodo non restituisce l'indice del segno meno flessibile ma restituisce invece l'indice di "m" quando esegue un confronto con distinzione delle impostazioni cultura.Note that in the case of the first string, which includes the soft hyphen followed by an "m", the method fails to return the index of the soft hyphen but instead returns the index of the "m" when it performs a culture-sensitive comparison. Il metodo restituisce l'indice del segno meno facoltativo nella prima stringa solo quando esegue un confronto ordinale.The method returns the index of the soft hyphen in the first string only when it performs an ordinal comparison.

[!code-vbSystem.Globalization.CompareInfo.LastIndexOf#16][!code-vbSystem.Globalization.CompareInfo.LastIndexOf#16]

Vedi anche

LastIndexOf(String, String, Int32, CompareOptions) LastIndexOf(String, String, Int32, CompareOptions) LastIndexOf(String, String, Int32, CompareOptions) LastIndexOf(String, String, Int32, CompareOptions)

Cerca la sottostringa specificata e restituisce l'indice in base zero dell'ultima occorrenza nella sezione della stringa di origine compresa tra l'inizio della stringa e l'indice specificato, usando il valore CompareOptions specificato.Searches for the specified substring and returns the zero-based index of the last occurrence within the section of the source string that extends from the beginning of the string to the specified index using the specified CompareOptions value.

public:
 virtual int LastIndexOf(System::String ^ source, System::String ^ value, int startIndex, System::Globalization::CompareOptions options);
public virtual int LastIndexOf (string source, string value, int startIndex, System.Globalization.CompareOptions options);
abstract member LastIndexOf : string * string * int * System.Globalization.CompareOptions -> int
override this.LastIndexOf : string * string * int * System.Globalization.CompareOptions -> int
Public Overridable Function LastIndexOf (source As String, value As String, startIndex As Integer, options As CompareOptions) As Integer

Parametri

source
String String String String

Stringa in cui effettuare la ricerca.The string to search.

value
String String String String

Stringa da individuare all'interno di source.The string to locate within source.

startIndex
Int32 Int32 Int32 Int32

Indice iniziale in base zero della ricerca all'indietro.The zero-based starting index of the backward search.

options
CompareOptions CompareOptions CompareOptions CompareOptions

Valore che definisce la modalità di confronto di source e value.A value that defines how source and value should be compared. options è il valore di enumerazione Ordinal o la combinazione bit per bit di uno o più dei seguenti valori: IgnoreCase, IgnoreSymbols, IgnoreNonSpace, IgnoreWidth e IgnoreKanaType.options is either the enumeration value Ordinal, or a bitwise combination of one or more of the following values: IgnoreCase, IgnoreSymbols, IgnoreNonSpace, IgnoreWidth, and IgnoreKanaType.

Restituisce

Indice in base zero dell'ultima occorrenza di value, se presente, all'interno della sezione di source compresa tra l'inizio di source e startIndex, usando le opzioni di confronto specificate; in caso contrario, -1.The zero-based index of the last occurrence of value, if found, within the section of source that extends from the beginning of source to startIndex, using the specified comparison options; otherwise, -1. Restituisce startIndex se value è un carattere che è possibile ignorare.Returns startIndex if value is an ignorable character.

Eccezioni

source è null.source is null.

In alternativa-or-

value è null.value is null.

startIndex non è compreso nell'intervallo di indici validi per source.startIndex is outside the range of valid indexes for source.

options contiene un valore di CompareOptions non valido.options contains an invalid CompareOptions value.

Esempi

Nell'esempio seguente vengono determinati gli indici della prima e dell'ultima occorrenza di un carattere o di una sottostringa all'interno di una parte di una stringa.The following example determines the indexes of the first and last occurrences of a character or a substring within a portion of a string. Si noti IndexOf che LastIndexOf e eseguono la ricerca in parti diverse della stringa, anche con lo startIndex stesso parametro.Note that IndexOf and LastIndexOf are searching in different portions of the string, even with the same startIndex parameter.

using namespace System;
using namespace System::Globalization;
void PrintMarker( String^ Prefix, int First, int Last )
{
   
   // Determines the size of the array to create.
   int mySize;
   if ( Last > First )
      mySize = Last;
   else
      mySize = First;

   if ( mySize > -1 )
   {
      
      // Creates an array of Char to hold the markers.
      array<Char>^myCharArr = gcnew array<Char>(mySize + 1);
      
      // Inserts the appropriate markers.
      if ( First > -1 )
            myCharArr[ First ] = 'f';
      if ( Last > -1 )
            myCharArr[ Last ] = 'l';
      if ( First == Last )
            myCharArr[ First ] = 'b';
      
      // Displays the array of Char as a String.
      Console::WriteLine( "{0}{1}", Prefix, gcnew String( myCharArr ) );
   }
   else
      Console::WriteLine( Prefix );
}

int main()
{
   
   // Creates CompareInfo for the InvariantCulture.
   CompareInfo^ myComp = CultureInfo::InvariantCulture->CompareInfo;
   
   // iS is the starting index of the substring.
   int iS = 20;
   
   // myT1 is the string used for padding.
   String^ myT1;
   
   // Searches for the ligature Æ.
   String^ myStr = "Is AE or ae the same as Æ or æ?";
   Console::WriteLine();
   myT1 = gcnew String( '-',iS );
   Console::WriteLine( "IndexOf( String, *, {0}, * )", iS );
   Console::WriteLine( "Original      : {0}", myStr );
   Console::WriteLine( "No options    : {0}{1}", myT1, myStr->Substring( iS ) );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", iS ), -1 );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", iS ), -1 );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', iS ), -1 );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', iS ), -1 );
   Console::WriteLine( "Ordinal       : {0}{1}", myT1, myStr->Substring( iS ) );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", iS, CompareOptions::Ordinal ), -1 );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", iS, CompareOptions::Ordinal ), -1 );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', iS, CompareOptions::Ordinal ), -1 );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', iS, CompareOptions::Ordinal ), -1 );
   Console::WriteLine( "IgnoreCase    : {0}{1}", myT1, myStr->Substring( iS ) );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", iS, CompareOptions::IgnoreCase ), -1 );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", iS, CompareOptions::IgnoreCase ), -1 );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', iS, CompareOptions::IgnoreCase ), -1 );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', iS, CompareOptions::IgnoreCase ), -1 );
   myT1 = gcnew String( '-',myStr->Length - iS - 1 );
   Console::WriteLine( "LastIndexOf( String, *, {0}, * )", iS );
   Console::WriteLine( "Original      : {0}", myStr );
   Console::WriteLine( "No options    : {0}{1}", myStr->Substring( 0, iS + 1 ), myT1 );
   PrintMarker( "           AE : ", -1, myComp->LastIndexOf( myStr, "AE", iS ) );
   PrintMarker( "           ae : ", -1, myComp->LastIndexOf( myStr, "ae", iS ) );
   PrintMarker( "            Æ : ", -1, myComp->LastIndexOf( myStr, L'Æ', iS ) );
   PrintMarker( "            æ : ", -1, myComp->LastIndexOf( myStr, L'æ', iS ) );
   Console::WriteLine( "Ordinal       : {0}{1}", myStr->Substring( 0, iS + 1 ), myT1 );
   PrintMarker( "           AE : ", -1, myComp->LastIndexOf( myStr, "AE", iS, CompareOptions::Ordinal ) );
   PrintMarker( "           ae : ", -1, myComp->LastIndexOf( myStr, "ae", iS, CompareOptions::Ordinal ) );
   PrintMarker( "            Æ : ", -1, myComp->LastIndexOf( myStr, L'Æ', iS, CompareOptions::Ordinal ) );
   PrintMarker( "            æ : ", -1, myComp->LastIndexOf( myStr, L'æ', iS, CompareOptions::Ordinal ) );
   Console::WriteLine( "IgnoreCase    : {0}{1}", myStr->Substring( 0, iS + 1 ), myT1 );
   PrintMarker( "           AE : ", -1, myComp->LastIndexOf( myStr, "AE", iS, CompareOptions::IgnoreCase ) );
   PrintMarker( "           ae : ", -1, myComp->LastIndexOf( myStr, "ae", iS, CompareOptions::IgnoreCase ) );
   PrintMarker( "            Æ : ", -1, myComp->LastIndexOf( myStr, L'Æ', iS, CompareOptions::IgnoreCase ) );
   PrintMarker( "            æ : ", -1, myComp->LastIndexOf( myStr, L'æ', iS, CompareOptions::IgnoreCase ) );
   
   // Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
   myStr = "Is U\u0308 or u\u0308 the same as \u00DC or \u00FC?";
   Console::WriteLine();
   myT1 = gcnew String( '-',iS );
   Console::WriteLine( "IndexOf( String, *, {0}, * )", iS );
   Console::WriteLine( "Original      : {0}", myStr );
   Console::WriteLine( "No options    : {0}{1}", myT1, myStr->Substring( iS ) );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", iS ), -1 );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", iS ), -1 );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', iS ), -1 );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', iS ), -1 );
   Console::WriteLine( "Ordinal       : {0}{1}", myT1, myStr->Substring( iS ) );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", iS, CompareOptions::Ordinal ), -1 );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", iS, CompareOptions::Ordinal ), -1 );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', iS, CompareOptions::Ordinal ), -1 );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', iS, CompareOptions::Ordinal ), -1 );
   Console::WriteLine( "IgnoreCase    : {0}{1}", myT1, myStr->Substring( iS ) );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", iS, CompareOptions::IgnoreCase ), -1 );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", iS, CompareOptions::IgnoreCase ), -1 );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', iS, CompareOptions::IgnoreCase ), -1 );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', iS, CompareOptions::IgnoreCase ), -1 );
   myT1 = gcnew String( '-',myStr->Length - iS - 1 );
   Console::WriteLine( "LastIndexOf( String, *, {0}, * )", iS );
   Console::WriteLine( "Original      : {0}", myStr );
   Console::WriteLine( "No options    : {0}{1}", myStr->Substring( 0, iS + 1 ), myT1 );
   PrintMarker( "           U\u0308 : ", -1, myComp->LastIndexOf( myStr, "U\u0308", iS ) );
   PrintMarker( "           u\u0308 : ", -1, myComp->LastIndexOf( myStr, "u\u0308", iS ) );
   PrintMarker( "            Ü : ", -1, myComp->LastIndexOf( myStr, L'Ü', iS ) );
   PrintMarker( "            ü : ", -1, myComp->LastIndexOf( myStr, L'ü', iS ) );
   Console::WriteLine( "Ordinal       : {0}{1}", myStr->Substring( 0, iS + 1 ), myT1 );
   PrintMarker( "           U\u0308 : ", -1, myComp->LastIndexOf( myStr, "U\u0308", iS, CompareOptions::Ordinal ) );
   PrintMarker( "           u\u0308 : ", -1, myComp->LastIndexOf( myStr, "u\u0308", iS, CompareOptions::Ordinal ) );
   PrintMarker( "            Ü : ", -1, myComp->LastIndexOf( myStr, L'Ü', iS, CompareOptions::Ordinal ) );
   PrintMarker( "            ü : ", -1, myComp->LastIndexOf( myStr, L'ü', iS, CompareOptions::Ordinal ) );
   Console::WriteLine( "IgnoreCase    : {0}{1}", myStr->Substring( 0, iS + 1 ), myT1 );
   PrintMarker( "           U\u0308 : ", -1, myComp->LastIndexOf( myStr, "U\u0308", iS, CompareOptions::IgnoreCase ) );
   PrintMarker( "           u\u0308 : ", -1, myComp->LastIndexOf( myStr, "u\u0308", iS, CompareOptions::IgnoreCase ) );
   PrintMarker( "            Ü : ", -1, myComp->LastIndexOf( myStr, L'Ü', iS, CompareOptions::IgnoreCase ) );
   PrintMarker( "            ü : ", -1, myComp->LastIndexOf( myStr, L'ü', iS, CompareOptions::IgnoreCase ) );
}

/*
This code produces the following output.

IndexOf( String, *, 20, * )
Original      : Is AE or ae the same as Æ or æ?
No options    : -------------------- as Æ or æ?
           AE :                         f
           ae :                              f
            Æ :                         f
            æ :                              f
Ordinal       : -------------------- as Æ or æ?
           AE :
           ae :
            Æ :                         f
            æ :                              f
IgnoreCase    : -------------------- as Æ or æ?
           AE :                         f
           ae :                         f
            Æ :                         f
            æ :                         f
LastIndexOf( String, *, 20, * )
Original      : Is AE or ae the same as Æ or æ?
No options    : Is AE or ae the same ----------
           AE :    l
           ae :          l
            Æ :    l
            æ :          l
Ordinal       : Is AE or ae the same ----------
           AE :    l
           ae :          l
            Æ :
            æ :
IgnoreCase    : Is AE or ae the same ----------
           AE :          l
           ae :          l
            Æ :          l
            æ :          l

IndexOf( String, *, 20, * )
Original      : Is U" or u" the same as Ü or ü?
No options    : -------------------- as Ü or ü?
           U" :                         f
           u" :                              f
            Ü :                         f
            ü :                              f
Ordinal       : -------------------- as Ü or ü?
           U" :
           u" :
            Ü :                         f
            ü :                              f
IgnoreCase    : -------------------- as Ü or ü?
           U" :                         f
           u" :                         f
            Ü :                         f
            ü :                         f
LastIndexOf( String, *, 20, * )
Original      : Is U" or u" the same as Ü or ü?
No options    : Is U" or u" the same ----------
           U" :    l
           u" :          l
            Ü :    l
            ü :          l
Ordinal       : Is U" or u" the same ----------
           U" :    l
           u" :          l
            Ü :
            ü :
IgnoreCase    : Is U" or u" the same ----------
           U" :          l
           u" :          l
            Ü :          l
            ü :          l

*/
using System;
using System.Globalization;

public class SamplesCompareInfo  {

   public static void Main()  {

      // Creates CompareInfo for the InvariantCulture.
      CompareInfo myComp = CultureInfo.InvariantCulture.CompareInfo;

      // iS is the starting index of the substring.
      int iS = 20;
      // myT1 is the string used for padding.
      String myT1;

      // Searches for the ligature Æ.
      String myStr = "Is AE or ae the same as Æ or æ?";
      Console.WriteLine();

      myT1 = new String( '-', iS );
      Console.WriteLine( "IndexOf( String, *, {0}, * )", iS );
      Console.WriteLine( "Original      : {0}", myStr );
      Console.WriteLine( "No options    : {0}{1}", myT1, myStr.Substring( iS ) );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", iS ), -1 );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", iS ), -1 );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', iS ), -1 );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', iS ), -1 );
      Console.WriteLine( "Ordinal       : {0}{1}", myT1, myStr.Substring( iS ) );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", iS, CompareOptions.Ordinal ), -1 );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", iS, CompareOptions.Ordinal ), -1 );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', iS, CompareOptions.Ordinal ), -1 );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', iS, CompareOptions.Ordinal ), -1 );
      Console.WriteLine( "IgnoreCase    : {0}{1}", myT1, myStr.Substring( iS ) );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", iS, CompareOptions.IgnoreCase ), -1 );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", iS, CompareOptions.IgnoreCase ), -1 );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', iS, CompareOptions.IgnoreCase ), -1 );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', iS, CompareOptions.IgnoreCase ), -1 );

      myT1 = new String( '-', myStr.Length - iS - 1 );
      Console.WriteLine( "LastIndexOf( String, *, {0}, * )", iS );
      Console.WriteLine( "Original      : {0}", myStr );
      Console.WriteLine( "No options    : {0}{1}", myStr.Substring( 0, iS + 1 ), myT1 );
      PrintMarker( "           AE : ", -1, myComp.LastIndexOf( myStr, "AE", iS ) );
      PrintMarker( "           ae : ", -1, myComp.LastIndexOf( myStr, "ae", iS ) );
      PrintMarker( "            Æ : ", -1, myComp.LastIndexOf( myStr, 'Æ', iS ) );
      PrintMarker( "            æ : ", -1, myComp.LastIndexOf( myStr, 'æ', iS ) );
      Console.WriteLine( "Ordinal       : {0}{1}", myStr.Substring( 0, iS + 1 ), myT1 );
      PrintMarker( "           AE : ", -1, myComp.LastIndexOf( myStr, "AE", iS, CompareOptions.Ordinal ) );
      PrintMarker( "           ae : ", -1, myComp.LastIndexOf( myStr, "ae", iS, CompareOptions.Ordinal ) );
      PrintMarker( "            Æ : ", -1, myComp.LastIndexOf( myStr, 'Æ', iS, CompareOptions.Ordinal ) );
      PrintMarker( "            æ : ", -1, myComp.LastIndexOf( myStr, 'æ', iS, CompareOptions.Ordinal ) );
      Console.WriteLine( "IgnoreCase    : {0}{1}", myStr.Substring( 0, iS + 1 ), myT1 );
      PrintMarker( "           AE : ", -1, myComp.LastIndexOf( myStr, "AE", iS, CompareOptions.IgnoreCase ) );
      PrintMarker( "           ae : ", -1, myComp.LastIndexOf( myStr, "ae", iS, CompareOptions.IgnoreCase ) );
      PrintMarker( "            Æ : ", -1, myComp.LastIndexOf( myStr, 'Æ', iS, CompareOptions.IgnoreCase ) );
      PrintMarker( "            æ : ", -1, myComp.LastIndexOf( myStr, 'æ', iS, CompareOptions.IgnoreCase ) );

      // Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
      myStr = "Is \u0055\u0308 or \u0075\u0308 the same as \u00DC or \u00FC?";
      Console.WriteLine();

      myT1 = new String( '-', iS );
      Console.WriteLine( "IndexOf( String, *, {0}, * )", iS );
      Console.WriteLine( "Original      : {0}", myStr );
      Console.WriteLine( "No options    : {0}{1}", myT1, myStr.Substring( iS ) );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", iS ), -1 );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", iS ), -1 );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', iS ), -1 );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', iS ), -1 );
      Console.WriteLine( "Ordinal       : {0}{1}", myT1, myStr.Substring( iS ) );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", iS, CompareOptions.Ordinal ), -1 );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", iS, CompareOptions.Ordinal ), -1 );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', iS, CompareOptions.Ordinal ), -1 );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', iS, CompareOptions.Ordinal ), -1 );
      Console.WriteLine( "IgnoreCase    : {0}{1}", myT1, myStr.Substring( iS ) );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", iS, CompareOptions.IgnoreCase ), -1 );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", iS, CompareOptions.IgnoreCase ), -1 );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', iS, CompareOptions.IgnoreCase ), -1 );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', iS, CompareOptions.IgnoreCase ), -1 );

      myT1 = new String( '-', myStr.Length - iS - 1 );
      Console.WriteLine( "LastIndexOf( String, *, {0}, * )", iS );
      Console.WriteLine( "Original      : {0}", myStr );
      Console.WriteLine( "No options    : {0}{1}", myStr.Substring( 0, iS + 1 ), myT1 );
      PrintMarker( "           U\u0308 : ", -1, myComp.LastIndexOf( myStr, "U\u0308", iS ) );
      PrintMarker( "           u\u0308 : ", -1, myComp.LastIndexOf( myStr, "u\u0308", iS ) );
      PrintMarker( "            Ü : ", -1, myComp.LastIndexOf( myStr, 'Ü', iS ) );
      PrintMarker( "            ü : ", -1, myComp.LastIndexOf( myStr, 'ü', iS ) );
      Console.WriteLine( "Ordinal       : {0}{1}", myStr.Substring( 0, iS + 1 ), myT1 );
      PrintMarker( "           U\u0308 : ", -1, myComp.LastIndexOf( myStr, "U\u0308", iS, CompareOptions.Ordinal ) );
      PrintMarker( "           u\u0308 : ", -1, myComp.LastIndexOf( myStr, "u\u0308", iS, CompareOptions.Ordinal ) );
      PrintMarker( "            Ü : ", -1, myComp.LastIndexOf( myStr, 'Ü', iS, CompareOptions.Ordinal ) );
      PrintMarker( "            ü : ", -1, myComp.LastIndexOf( myStr, 'ü', iS, CompareOptions.Ordinal ) );
      Console.WriteLine( "IgnoreCase    : {0}{1}", myStr.Substring( 0, iS + 1 ), myT1 );
      PrintMarker( "           U\u0308 : ", -1, myComp.LastIndexOf( myStr, "U\u0308", iS, CompareOptions.IgnoreCase ) );
      PrintMarker( "           u\u0308 : ", -1, myComp.LastIndexOf( myStr, "u\u0308", iS, CompareOptions.IgnoreCase ) );
      PrintMarker( "            Ü : ", -1, myComp.LastIndexOf( myStr, 'Ü', iS, CompareOptions.IgnoreCase ) );
      PrintMarker( "            ü : ", -1, myComp.LastIndexOf( myStr, 'ü', iS, CompareOptions.IgnoreCase ) );

   }

   public static void PrintMarker( String Prefix, int First, int Last )  {

      // Determines the size of the array to create.
      int mySize;
      if ( Last > First )
         mySize = Last;
      else
         mySize = First;

      if ( mySize > -1 )  {

         // Creates an array of Char to hold the markers.
         Char[] myCharArr = new Char[mySize+1];

         // Inserts the appropriate markers.
         if ( First > -1 )
         myCharArr[First] = 'f';
         if ( Last > -1 )
            myCharArr[Last] = 'l';
         if ( First == Last )
         myCharArr[First] = 'b';

         // Displays the array of Char as a String.
         Console.WriteLine( "{0}{1}", Prefix, new String( myCharArr ) );

      }
      else
         Console.WriteLine( Prefix );

   }

}


/*
This code produces the following output.

IndexOf( String, *, 20, * )
Original      : Is AE or ae the same as Æ or æ?
No options    : -------------------- as Æ or æ?
           AE :                         f
           ae :                              f
            Æ :                         f
            æ :                              f
Ordinal       : -------------------- as Æ or æ?
           AE :
           ae :
            Æ :                         f
            æ :                              f
IgnoreCase    : -------------------- as Æ or æ?
           AE :                         f
           ae :                         f
            Æ :                         f
            æ :                         f
LastIndexOf( String, *, 20, * )
Original      : Is AE or ae the same as Æ or æ?
No options    : Is AE or ae the same ----------
           AE :    l
           ae :          l
            Æ :    l
            æ :          l
Ordinal       : Is AE or ae the same ----------
           AE :    l
           ae :          l
            Æ :
            æ :
IgnoreCase    : Is AE or ae the same ----------
           AE :          l
           ae :          l
            Æ :          l
            æ :          l

IndexOf( String, *, 20, * )
Original      : Is U" or u" the same as Ü or ü?
No options    : -------------------- as Ü or ü?
           U" :                         f
           u" :                              f
            Ü :                         f
            ü :                              f
Ordinal       : -------------------- as Ü or ü?
           U" :
           u" :
            Ü :                         f
            ü :                              f
IgnoreCase    : -------------------- as Ü or ü?
           U" :                         f
           u" :                         f
            Ü :                         f
            ü :                         f
LastIndexOf( String, *, 20, * )
Original      : Is U" or u" the same as Ü or ü?
No options    : Is U" or u" the same ----------
           U" :    l
           u" :          l
            Ü :    l
            ü :          l
Ordinal       : Is U" or u" the same ----------
           U" :    l
           u" :          l
            Ü :
            ü :
IgnoreCase    : Is U" or u" the same ----------
           U" :          l
           u" :          l
            Ü :          l
            ü :          l

*/
Imports System
Imports System.Globalization
Imports Microsoft.VisualBasic

Public Class SamplesCompareInfo

   Public Shared Sub Main()

      ' Creates CompareInfo for the InvariantCulture.
      Dim myComp As CompareInfo = CultureInfo.InvariantCulture.CompareInfo

      ' iS is the starting index of the substring.
      Dim [iS] As Integer = 20
      ' myT1 is the string used for padding.
      Dim myT1 As [String]

      ' Searches for the ligature Æ.
      Dim myStr As [String] = "Is AE or ae the same as Æ or æ?"
      Console.WriteLine()

      myT1 = New [String]("-"c, [iS])
      Console.WriteLine("IndexOf( String, *, {0}, * )", [iS])
      Console.WriteLine("Original      : {0}", myStr)
      Console.WriteLine("No options    : {0}{1}", myT1, myStr.Substring([iS]))
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", [iS]), - 1)
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", [iS]), - 1)
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, [iS]), - 1)
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, [iS]), - 1)
      Console.WriteLine("Ordinal       : {0}{1}", myT1, myStr.Substring([iS]))
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", [iS], CompareOptions.Ordinal), - 1)
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", [iS], CompareOptions.Ordinal), - 1)
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, [iS], CompareOptions.Ordinal), - 1)
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, [iS], CompareOptions.Ordinal), - 1)
      Console.WriteLine("IgnoreCase    : {0}{1}", myT1, myStr.Substring([iS]))
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", [iS], CompareOptions.IgnoreCase), - 1)
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", [iS], CompareOptions.IgnoreCase), - 1)
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, [iS], CompareOptions.IgnoreCase), - 1)
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, [iS], CompareOptions.IgnoreCase), - 1)

      myT1 = New [String]("-"c, myStr.Length - [iS] - 1)
      Console.WriteLine("LastIndexOf( String, *, {0}, * )", [iS])
      Console.WriteLine("Original      : {0}", myStr)
      Console.WriteLine("No options    : {0}{1}", myStr.Substring(0, [iS] + 1), myT1)
      PrintMarker("           AE : ", - 1, myComp.LastIndexOf(myStr, "AE", [iS]))
      PrintMarker("           ae : ", - 1, myComp.LastIndexOf(myStr, "ae", [iS]))
      PrintMarker("            Æ : ", - 1, myComp.LastIndexOf(myStr, "Æ"c, [iS]))
      PrintMarker("            æ : ", - 1, myComp.LastIndexOf(myStr, "æ"c, [iS]))
      Console.WriteLine("Ordinal       : {0}{1}", myStr.Substring(0, [iS] + 1), myT1)
      PrintMarker("           AE : ", - 1, myComp.LastIndexOf(myStr, "AE", [iS], CompareOptions.Ordinal))
      PrintMarker("           ae : ", - 1, myComp.LastIndexOf(myStr, "ae", [iS], CompareOptions.Ordinal))
      PrintMarker("            Æ : ", - 1, myComp.LastIndexOf(myStr, "Æ"c, [iS], CompareOptions.Ordinal))
      PrintMarker("            æ : ", - 1, myComp.LastIndexOf(myStr, "æ"c, [iS], CompareOptions.Ordinal))
      Console.WriteLine("IgnoreCase    : {0}{1}", myStr.Substring(0, [iS] + 1), myT1)
      PrintMarker("           AE : ", - 1, myComp.LastIndexOf(myStr, "AE", [iS], CompareOptions.IgnoreCase))
      PrintMarker("           ae : ", - 1, myComp.LastIndexOf(myStr, "ae", [iS], CompareOptions.IgnoreCase))
      PrintMarker("            Æ : ", - 1, myComp.LastIndexOf(myStr, "Æ"c, [iS], CompareOptions.IgnoreCase))
      PrintMarker("            æ : ", - 1, myComp.LastIndexOf(myStr, "æ"c, [iS], CompareOptions.IgnoreCase))

      ' Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
      myStr = "Is " & ChrW(&H0055) & ChrW(&H0308) & " or " & ChrW(&H0075) & ChrW(&H0308) & " the same as " & ChrW(&H00DC) & " or " & ChrW(&H00FC) & "?"
      Console.WriteLine()

      myT1 = New [String]("-"c, [iS])
      Console.WriteLine("IndexOf( String, *, {0}, * )", [iS])
      Console.WriteLine("Original      : {0}", myStr)
      Console.WriteLine("No options    : {0}{1}", myT1, myStr.Substring([iS]))
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), [iS]), - 1)
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), [iS]), - 1)
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, [iS]), - 1)
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, [iS]), - 1)
      Console.WriteLine("Ordinal       : {0}{1}", myT1, myStr.Substring([iS]))
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), [iS], CompareOptions.Ordinal), - 1)
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), [iS], CompareOptions.Ordinal), - 1)
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, [iS], CompareOptions.Ordinal), - 1)
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, [iS], CompareOptions.Ordinal), - 1)
      Console.WriteLine("IgnoreCase    : {0}{1}", myT1, myStr.Substring([iS]))
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), [iS], CompareOptions.IgnoreCase), - 1)
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), [iS], CompareOptions.IgnoreCase), - 1)
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, [iS], CompareOptions.IgnoreCase), - 1)
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, [iS], CompareOptions.IgnoreCase), - 1)

      myT1 = New [String]("-"c, myStr.Length - [iS] - 1)
      Console.WriteLine("LastIndexOf( String, *, {0}, * )", [iS])
      Console.WriteLine("Original      : {0}", myStr)
      Console.WriteLine("No options    : {0}{1}", myStr.Substring(0, [iS] + 1), myT1)
      PrintMarker("           U" & ChrW(&H0308) & " : ", - 1, myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), [iS]))
      PrintMarker("           u" & ChrW(&H0308) & " : ", - 1, myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), [iS]))
      PrintMarker("            Ü : ", - 1, myComp.LastIndexOf(myStr, "Ü"c, [iS]))
      PrintMarker("            ü : ", - 1, myComp.LastIndexOf(myStr, "ü"c, [iS]))
      Console.WriteLine("Ordinal       : {0}{1}", myStr.Substring(0, [iS] + 1), myT1)
      PrintMarker("           U" & ChrW(&H0308) & " : ", - 1, myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), [iS], CompareOptions.Ordinal))
      PrintMarker("           u" & ChrW(&H0308) & " : ", - 1, myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), [iS], CompareOptions.Ordinal))
      PrintMarker("            Ü : ", - 1, myComp.LastIndexOf(myStr, "Ü"c, [iS], CompareOptions.Ordinal))
      PrintMarker("            ü : ", - 1, myComp.LastIndexOf(myStr, "ü"c, [iS], CompareOptions.Ordinal))
      Console.WriteLine("IgnoreCase    : {0}{1}", myStr.Substring(0, [iS] + 1), myT1)
      PrintMarker("           U" & ChrW(&H0308) & " : ", - 1, myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), [iS], CompareOptions.IgnoreCase))
      PrintMarker("           u" & ChrW(&H0308) & " : ", - 1, myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), [iS], CompareOptions.IgnoreCase))
      PrintMarker("            Ü : ", - 1, myComp.LastIndexOf(myStr, "Ü"c, [iS], CompareOptions.IgnoreCase))
      PrintMarker("            ü : ", - 1, myComp.LastIndexOf(myStr, "ü"c, [iS], CompareOptions.IgnoreCase))

   End Sub 'Main

   Public Shared Sub PrintMarker(Prefix As [String], First As Integer, Last As Integer)

      ' Determines the size of the array to create.
      Dim mySize As Integer
      If Last > First Then
         mySize = Last
      Else
         mySize = First
      End If 

      If mySize > - 1 Then

         ' Creates an array of Char to hold the markers.
         Dim myCharArr(mySize + 1) As [Char]

         ' Inserts the appropriate markers.
         If First > - 1 Then
            myCharArr(First) = "f"c
         End If
         If Last > - 1 Then
            myCharArr(Last) = "l"c
         End If
         If First = Last Then
            myCharArr(First) = "b"c
         End If 

         ' Displays the array of Char as a String.
         Console.WriteLine("{0}{1}", Prefix, New [String](myCharArr))
      
      Else
         Console.WriteLine(Prefix)

      End If 

   End Sub 'PrintMarker

End Class 'SamplesCompareInfo 


'This code produces the following output.
'
'IndexOf( String, *, 20, * )
'Original      : Is AE or ae the same as Æ or æ?
'No options    : -------------------- as Æ or æ?
'           AE :                         f
'           ae :                              f
'            Æ :                         f
'            æ :                              f
'Ordinal       : -------------------- as Æ or æ?
'           AE :
'           ae :
'            Æ :                         f
'            æ :                              f
'IgnoreCase    : -------------------- as Æ or æ?
'           AE :                         f
'           ae :                         f
'            Æ :                         f
'            æ :                         f
'LastIndexOf( String, *, 20, * )
'Original      : Is AE or ae the same as Æ or æ?
'No options    : Is AE or ae the same ----------
'           AE :    l
'           ae :          l
'            Æ :    l
'            æ :          l
'Ordinal       : Is AE or ae the same ----------
'           AE :    l
'           ae :          l
'            Æ :
'            æ :
'IgnoreCase    : Is AE or ae the same ----------
'           AE :          l
'           ae :          l
'            Æ :          l
'            æ :          l
'
'IndexOf( String, *, 20, * )
'Original      : Is U" or u" the same as Ü or ü?
'No options    : -------------------- as Ü or ü?
'           U" :                         f
'           u" :                              f
'            Ü :                         f
'            ü :                              f
'Ordinal       : -------------------- as Ü or ü?
'           U" :
'           u" :
'            Ü :                         f
'            ü :                              f
'IgnoreCase    : -------------------- as Ü or ü?
'           U" :                         f
'           u" :                         f
'            Ü :                         f
'            ü :                         f
'LastIndexOf( String, *, 20, * )
'Original      : Is U" or u" the same as Ü or ü?
'No options    : Is U" or u" the same ----------
'           U" :    l
'           u" :          l
'            Ü :    l
'            ü :          l
'Ordinal       : Is U" or u" the same ----------
'           U" :    l
'           u" :          l
'            Ü :
'            ü :
'IgnoreCase    : Is U" or u" the same ----------
'           U" :          l
'           u" :          l
'            Ü :          l
'            ü :          l

Commenti

La stringa di origine viene cercata all' startIndex indietro a partire da e termina all'inizio della stringa.The source string is searched backward starting at startIndex and ending at the beginning of the string.

Il CompareOptions.StringSort valore non è valido per questo metodo.The CompareOptions.StringSort value is not valid for this method.

Se options non include il Ordinal valore, questo overload esegue una ricerca con distinzione delle impostazioni cultura.If options does not include the Ordinal value, this overload performs a culture-sensitive search. Un valore Unicode che rappresenta un carattere precomposto, ad esempio la legatura "Æ" (U + 00C6), può essere considerato equivalente a qualsiasi occorrenza dei componenti del carattere nella sequenza corretta, ad esempio "AE" (U + 0041, U + 0045), a seconda delle impostazioni cultura.A Unicode value representing a precomposed character, such as the ligature "Æ" (U+00C6), might be considered equivalent to any occurrence of the character's components in the correct sequence, such as "AE" (U+0041, U+0045), depending on the culture. Se options include il Ordinal valore, questo overload esegue una ricerca ordinale (indipendente dalle impostazioni cultura), in cui vengono confrontati i valori Unicode.If options includes the Ordinal value, this overload performs an ordinal (culture-insensitive) search, where the Unicode values are compared.

Nota

Quando possibile, è necessario chiamare i metodi di confronto tra stringhe con un parametro CompareOptions di tipo per specificare il tipo di confronto previsto.When possible, you should call string comparison methods that have a parameter of type CompareOptions to specify the kind of comparison expected. Come regola generale, usare le opzioni linguistiche (usando le impostazioni cultura correnti) per confrontare le stringhe visualizzate nell'interfaccia utente CompareOptions.Ordinal e CompareOptions.OrdinalIgnoreCase specificare o per i confronti di sicurezza.As a general rule, use linguistic options (using the current culture) for comparing strings displayed in the user interface and specify CompareOptions.Ordinal or CompareOptions.OrdinalIgnoreCase for security comparisons.

Note per i chiamanti

I set di caratteri includono caratteri ignorabili, ovvero caratteri che non vengono considerati quando si esegue un ordinamento linguistico o con distinzione delle impostazioni cultura.Character sets include ignorable characters, which are characters that are not considered when performing a linguistic or culture-sensitive sort. In una ricerca dipendente dalle impostazioni cultura (ovvero se options non è Ordinal o OrdinalIgnoreCase), se value contiene un carattere ignorable, il risultato è equivalente alla ricerca con il carattere rimosso.In a culture-sensitive search (that is, if options is not Ordinal or OrdinalIgnoreCase), if value contains an ignorable character, the result is equivalent to searching with that character removed. Se value è costituito solo da uno o più caratteri ignorabili LastIndexOf(String, String, Int32, CompareOptions) , il metodo startIndexrestituisce sempre, ovvero la posizione del carattere in corrispondenza della quale ha inizio la ricerca.If value consists only of one or more ignorable characters, the LastIndexOf(String, String, Int32, CompareOptions) method always returns startIndex, which is the character position at which the search begins.

Nell'esempio seguente viene usato il LastIndexOf(String, String, Int32, CompareOptions) metodo per trovare la posizione di un trattino (U + 00AD) seguito da un "m", a partire dalla "m" finale in due stringhe.In the following example, the LastIndexOf(String, String, Int32, CompareOptions) method is used to find the position of a soft hyphen (U+00AD) followed by an "m", starting with the final "m" in two strings. Solo una delle stringhe contiene la sottostringa richiesta.Only one of the strings contains the required substring. In entrambi i casi, poiché il segno meno facoltativo è un carattere ignorabile, il metodo restituisce l'indice di "m" nella stringa quando viene eseguito un confronto dipendente dalle impostazioni cultura.In both cases, because the soft hyphen is an ignorable character, the method returns the index of "m" in the string when it performs a culture-sensitive comparison. Si noti che nel caso della prima stringa, che include il segno meno facoltativo seguito da una "m", il metodo non restituisce l'indice del segno meno facoltativo, ma l'indice di "m".Note that in the case of the first string, which includes the soft hyphen followed by an "m", the method fails to return the index of the soft hyphen but instead returns the index of the "m". Il metodo restituisce l'indice del segno meno facoltativo nella prima stringa solo quando esegue un confronto ordinale.The method returns the index of the soft hyphen in the first string only when it performs an ordinal comparison.

[!code-csharpSystem.Globalization.CompareInfo.LastIndexOf#15] [!code-vbSystem.Globalization.CompareInfo.LastIndexOf#15][!code-csharpSystem.Globalization.CompareInfo.LastIndexOf#15] [!code-vbSystem.Globalization.CompareInfo.LastIndexOf#15]

Vedi anche

LastIndexOf(String, Char, Int32, Int32) LastIndexOf(String, Char, Int32, Int32) LastIndexOf(String, Char, Int32, Int32) LastIndexOf(String, Char, Int32, Int32)

Cerca il carattere specificato e restituisce l'indice in base zero dell'ultima occorrenza all'interno della sezione della stringa di origine che contiene il numero specificato di elementi e termina in corrispondenza dell'indice specificato.Searches for the specified character and returns the zero-based index of the last occurrence within the section of the source string that contains the specified number of elements and ends at the specified index.

public:
 virtual int LastIndexOf(System::String ^ source, char value, int startIndex, int count);
public virtual int LastIndexOf (string source, char value, int startIndex, int count);
abstract member LastIndexOf : string * char * int * int -> int
override this.LastIndexOf : string * char * int * int -> int
Public Overridable Function LastIndexOf (source As String, value As Char, startIndex As Integer, count As Integer) As Integer

Parametri

source
String String String String

Stringa in cui effettuare la ricerca.The string to search.

value
Char Char Char Char

Carattere da individuare all'interno di source.The character to locate within source.

startIndex
Int32 Int32 Int32 Int32

Indice iniziale in base zero della ricerca all'indietro.The zero-based starting index of the backward search.

count
Int32 Int32 Int32 Int32

Numero di elementi nella sezione in cui eseguire la ricerca.The number of elements in the section to search.

Restituisce

Indice in base zero dell'ultima occorrenza di value, se presente, all'interno della sezione di source che contiene il numero di elementi specificato da count e che termina in corrispondenza di startIndex; in caso contrario, -1.The zero-based index of the last occurrence of value, if found, within the section of source that contains the number of elements specified by count and that ends at startIndex; otherwise, -1. Restituisce startIndex se value è un carattere che è possibile ignorare.Returns startIndex if value is an ignorable character.

Eccezioni

startIndex non è compreso nell'intervallo di indici validi per source.startIndex is outside the range of valid indexes for source.

In alternativa-or-

count è minore di zero.count is less than zero.

In alternativa-or-

startIndex e count non specificano una sezione valida in source.startIndex and count do not specify a valid section in source.

Esempi

Nell'esempio seguente vengono determinati gli indici della prima e dell'ultima occorrenza di un carattere o di una sottostringa all'interno di una parte di una stringa.The following example determines the indexes of the first and last occurrences of a character or a substring within a portion of a string.

using namespace System;
using namespace System::Globalization;
void PrintMarker( String^ Prefix, int First, int Last )
{
   
   // Determines the size of the array to create.
   int mySize;
   if ( Last > First )
      mySize = Last;
   else
      mySize = First;

   if ( mySize > -1 )
   {
      
      // Creates an array of Char to hold the markers.
      array<Char>^myCharArr = gcnew array<Char>(mySize + 1);
      
      // Inserts the appropriate markers.
      if ( First > -1 )
            myCharArr[ First ] = 'f';
      if ( Last > -1 )
            myCharArr[ Last ] = 'l';
      if ( First == Last )
            myCharArr[ First ] = 'b';
      
      // Displays the array of Char as a String.
      Console::WriteLine( "{0}{1}", Prefix, gcnew String( myCharArr ) );
   }
   else
      Console::WriteLine( Prefix );
}

int main()
{
   
   // Creates CompareInfo for the InvariantCulture.
   CompareInfo^ myComp = CultureInfo::InvariantCulture->CompareInfo;
   
   // iS is the starting index of the substring.
   int iS = 8;
   
   // iL is the length of the substring.
   int iL = 18;
   
   // myT1 and myT2 are the strings used for padding.
   String^ myT1 = gcnew String( '-',iS );
   String^ myT2;
   
   // Searches for the ligature Æ.
   String^ myStr = "Is AE or ae the same as Æ or æ?";
   myT2 = gcnew String( '-',myStr->Length - iS - iL );
   Console::WriteLine();
   Console::WriteLine( "Original      : {0}", myStr );
   Console::WriteLine( "No options    : {0}{1}{2}", myT1, myStr->Substring( iS, iL ), myT2 );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", iS, iL ), myComp->LastIndexOf( myStr, "AE", iS + iL - 1, iL ) );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", iS, iL ), myComp->LastIndexOf( myStr, "ae", iS + iL - 1, iL ) );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', iS, iL ), myComp->LastIndexOf( myStr, L'Æ', iS + iL - 1, iL ) );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', iS, iL ), myComp->LastIndexOf( myStr, L'æ', iS + iL - 1, iL ) );
   Console::WriteLine( "Ordinal       : {0}{1}{2}", myT1, myStr->Substring( iS, iL ), myT2 );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "AE", iS + iL - 1, iL, CompareOptions::Ordinal ) );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "ae", iS + iL - 1, iL, CompareOptions::Ordinal ) );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'Æ', iS + iL - 1, iL, CompareOptions::Ordinal ) );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'æ', iS + iL - 1, iL, CompareOptions::Ordinal ) );
   Console::WriteLine( "IgnoreCase    : {0}{1}{2}", myT1, myStr->Substring( iS, iL ), myT2 );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "AE", iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "ae", iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'Æ', iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'æ', iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   
   // Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
   myStr = "Is U\u0308 or u\u0308 the same as \u00DC or \u00FC?";
   myT2 = gcnew String( '-',myStr->Length - iS - iL );
   Console::WriteLine();
   Console::WriteLine( "Original      : {0}", myStr );
   Console::WriteLine( "No options    : {0}{1}{2}", myT1, myStr->Substring( iS, iL ), myT2 );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", iS, iL ), myComp->LastIndexOf( myStr, "U\u0308", iS + iL - 1, iL ) );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", iS, iL ), myComp->LastIndexOf( myStr, "u\u0308", iS + iL - 1, iL ) );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', iS, iL ), myComp->LastIndexOf( myStr, L'Ü', iS + iL - 1, iL ) );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', iS, iL ), myComp->LastIndexOf( myStr, L'ü', iS + iL - 1, iL ) );
   Console::WriteLine( "Ordinal       : {0}{1}{2}", myT1, myStr->Substring( iS, iL ), myT2 );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "U\u0308", iS + iL - 1, iL, CompareOptions::Ordinal ) );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "u\u0308", iS + iL - 1, iL, CompareOptions::Ordinal ) );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'Ü', iS + iL - 1, iL, CompareOptions::Ordinal ) );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', iS, iL, CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'ü', iS + iL - 1, iL, CompareOptions::Ordinal ) );
   Console::WriteLine( "IgnoreCase    : {0}{1}{2}", myT1, myStr->Substring( iS, iL ), myT2 );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "U\u0308", iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "u\u0308", iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'Ü', iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', iS, iL, CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'ü', iS + iL - 1, iL, CompareOptions::IgnoreCase ) );
}

/*
This code produces the following output.

Original      : Is AE or ae the same as Æ or æ?
No options    : -------- ae the same as Æ -----
           AE :                         b
           ae :          b
            Æ :                         b
            æ :          b
Ordinal       : -------- ae the same as Æ -----
           AE :
           ae :          b
            Æ :                         b
            æ :
IgnoreCase    : -------- ae the same as Æ -----
           AE :          f              l
           ae :          f              l
            Æ :          f              l
            æ :          f              l

Original      : Is U" or u" the same as Ü or ü?
No options    : -------- u" the same as Ü -----
           U" :                         b
           u" :          b
            Ü :                         b
            ü :          b
Ordinal       : -------- u" the same as Ü -----
           U" :
           u" :          b
            Ü :                         b
            ü :
IgnoreCase    : -------- u" the same as Ü -----
           U" :          f              l
           u" :          f              l
            Ü :          f              l
            ü :          f              l

*/
using System;
using System.Globalization;

public class SamplesCompareInfo  {

   public static void Main()  {

      // Creates CompareInfo for the InvariantCulture.
      CompareInfo myComp = CultureInfo.InvariantCulture.CompareInfo;

      // iS is the starting index of the substring.
      int iS = 8;
      // iL is the length of the substring.
      int iL = 18;
      // myT1 and myT2 are the strings used for padding.
      String myT1 = new String( '-', iS );
      String myT2;

      // Searches for the ligature Æ.
      String myStr = "Is AE or ae the same as Æ or æ?";
      myT2 = new String( '-', myStr.Length - iS - iL );
      Console.WriteLine();
      Console.WriteLine( "Original      : {0}", myStr );
      Console.WriteLine( "No options    : {0}{1}{2}", myT1, myStr.Substring( iS, iL ), myT2 );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", iS, iL ), myComp.LastIndexOf( myStr, "AE", iS + iL - 1, iL ) );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", iS, iL ), myComp.LastIndexOf( myStr, "ae", iS + iL - 1, iL ) );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', iS, iL ), myComp.LastIndexOf( myStr, 'Æ', iS + iL - 1, iL ) );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', iS, iL ), myComp.LastIndexOf( myStr, 'æ', iS + iL - 1, iL ) );
      Console.WriteLine( "Ordinal       : {0}{1}{2}", myT1, myStr.Substring( iS, iL ), myT2 );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "AE", iS + iL - 1, iL, CompareOptions.Ordinal ) );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "ae", iS + iL - 1, iL, CompareOptions.Ordinal ) );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'Æ', iS + iL - 1, iL, CompareOptions.Ordinal ) );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'æ', iS + iL - 1, iL, CompareOptions.Ordinal ) );
      Console.WriteLine( "IgnoreCase    : {0}{1}{2}", myT1, myStr.Substring( iS, iL ), myT2 );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "AE", iS + iL - 1, iL, CompareOptions.IgnoreCase ) );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "ae", iS + iL - 1, iL, CompareOptions.IgnoreCase ) );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'Æ', iS + iL - 1, iL, CompareOptions.IgnoreCase ) );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'æ', iS + iL - 1, iL, CompareOptions.IgnoreCase ) );

      // Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
      myStr = "Is \u0055\u0308 or \u0075\u0308 the same as \u00DC or \u00FC?";
      myT2 = new String( '-', myStr.Length - iS - iL );
      Console.WriteLine();
      Console.WriteLine( "Original      : {0}", myStr );
      Console.WriteLine( "No options    : {0}{1}{2}", myT1, myStr.Substring( iS, iL ), myT2 );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", iS, iL ), myComp.LastIndexOf( myStr, "U\u0308", iS + iL - 1, iL ) );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", iS, iL ), myComp.LastIndexOf( myStr, "u\u0308", iS + iL - 1, iL ) );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', iS, iL ), myComp.LastIndexOf( myStr, 'Ü', iS + iL - 1, iL ) );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', iS, iL ), myComp.LastIndexOf( myStr, 'ü', iS + iL - 1, iL ) );
      Console.WriteLine( "Ordinal       : {0}{1}{2}", myT1, myStr.Substring( iS, iL ), myT2 );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "U\u0308", iS + iL - 1, iL, CompareOptions.Ordinal ) );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "u\u0308", iS + iL - 1, iL, CompareOptions.Ordinal ) );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'Ü', iS + iL - 1, iL, CompareOptions.Ordinal ) );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', iS, iL, CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'ü', iS + iL - 1, iL, CompareOptions.Ordinal ) );
      Console.WriteLine( "IgnoreCase    : {0}{1}{2}", myT1, myStr.Substring( iS, iL ), myT2 );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "U\u0308", iS + iL - 1, iL, CompareOptions.IgnoreCase ) );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "u\u0308", iS + iL - 1, iL, CompareOptions.IgnoreCase ) );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'Ü', iS + iL - 1, iL, CompareOptions.IgnoreCase ) );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', iS, iL, CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'ü', iS + iL - 1, iL, CompareOptions.IgnoreCase ) );

   }

   public static void PrintMarker( String Prefix, int First, int Last )  {

      // Determines the size of the array to create.
      int mySize;
      if ( Last > First )
         mySize = Last;
      else
         mySize = First;

      if ( mySize > -1 )  {

         // Creates an array of Char to hold the markers.
         Char[] myCharArr = new Char[mySize+1];

         // Inserts the appropriate markers.
         if ( First > -1 )
         myCharArr[First] = 'f';
         if ( Last > -1 )
            myCharArr[Last] = 'l';
         if ( First == Last )
         myCharArr[First] = 'b';

         // Displays the array of Char as a String.
         Console.WriteLine( "{0}{1}", Prefix, new String( myCharArr ) );

      }
      else
         Console.WriteLine( Prefix );

   }

}


/*
This code produces the following output.

Original      : Is AE or ae the same as Æ or æ?
No options    : -------- ae the same as Æ -----
           AE :                         b
           ae :          b
            Æ :                         b
            æ :          b
Ordinal       : -------- ae the same as Æ -----
           AE :
           ae :          b
            Æ :                         b
            æ :
IgnoreCase    : -------- ae the same as Æ -----
           AE :          f              l
           ae :          f              l
            Æ :          f              l
            æ :          f              l

Original      : Is U" or u" the same as Ü or ü?
No options    : -------- u" the same as Ü -----
           U" :                         b
           u" :          b
            Ü :                         b
            ü :          b
Ordinal       : -------- u" the same as Ü -----
           U" :
           u" :          b
            Ü :                         b
            ü :
IgnoreCase    : -------- u" the same as Ü -----
           U" :          f              l
           u" :          f              l
            Ü :          f              l
            ü :          f              l

*/
Imports System
Imports System.Globalization
Imports Microsoft.VisualBasic

Public Class SamplesCompareInfo

   Public Shared Sub Main()

      ' Creates CompareInfo for the InvariantCulture.
      Dim myComp As CompareInfo = CultureInfo.InvariantCulture.CompareInfo

      ' iS is the starting index of the substring.
      Dim [iS] As Integer = 8
      ' iL is the length of the substring.
      Dim iL As Integer = 18
      ' myT1 and myT2 are the strings used for padding.
      Dim myT1 As New [String]("-"c, [iS])
      Dim myT2 As [String]

      ' Searches for the ligature Æ.
      Dim myStr As [String] = "Is AE or ae the same as Æ or æ?"
      myT2 = New [String]("-"c, myStr.Length - [iS] - iL)
      Console.WriteLine()
      Console.WriteLine("Original      : {0}", myStr)
      Console.WriteLine("No options    : {0}{1}{2}", myT1, myStr.Substring([iS], iL), myT2)
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", [iS], iL), myComp.LastIndexOf(myStr, "AE", [iS] + iL - 1, iL))
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", [iS], iL), myComp.LastIndexOf(myStr, "ae", [iS] + iL - 1, iL))
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, [iS], iL), myComp.LastIndexOf(myStr, "Æ"c, [iS] + iL - 1, iL))
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, [iS], iL), myComp.LastIndexOf(myStr, "æ"c, [iS] + iL - 1, iL))
      Console.WriteLine("Ordinal       : {0}{1}{2}", myT1, myStr.Substring([iS], iL), myT2)
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "AE", [iS] + iL - 1, iL, CompareOptions.Ordinal))
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "ae", [iS] + iL - 1, iL, CompareOptions.Ordinal))
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "Æ"c, [iS] + iL - 1, iL, CompareOptions.Ordinal))
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "æ"c, [iS] + iL - 1, iL, CompareOptions.Ordinal))
      Console.WriteLine("IgnoreCase    : {0}{1}{2}", myT1, myStr.Substring([iS], iL), myT2)
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "AE", [iS] + iL - 1, iL, CompareOptions.IgnoreCase))
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "ae", [iS] + iL - 1, iL, CompareOptions.IgnoreCase))
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "Æ"c, [iS] + iL - 1, iL, CompareOptions.IgnoreCase))
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "æ"c, [iS] + iL - 1, iL, CompareOptions.IgnoreCase))

      ' Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
      myStr = "Is " & ChrW(&H0055) & ChrW(&H0308) & " or " & ChrW(&H0075) & ChrW(&H0308) & " the same as " & ChrW(&H00DC) & " or " & ChrW(&H00FC) & "?"
      myT2 = New [String]("-"c, myStr.Length - [iS] - iL)
      Console.WriteLine()
      Console.WriteLine("Original      : {0}", myStr)
      Console.WriteLine("No options    : {0}{1}{2}", myT1, myStr.Substring([iS], iL), myT2)
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), [iS], iL), myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), [iS] + iL - 1, iL))
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), [iS], iL), myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), [iS] + iL - 1, iL))
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, [iS], iL), myComp.LastIndexOf(myStr, "Ü"c, [iS] + iL - 1, iL))
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, [iS], iL), myComp.LastIndexOf(myStr, "ü"c, [iS] + iL - 1, iL))
      Console.WriteLine("Ordinal       : {0}{1}{2}", myT1, myStr.Substring([iS], iL), myT2)
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), [iS] + iL - 1, iL, CompareOptions.Ordinal))
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), [iS] + iL - 1, iL, CompareOptions.Ordinal))
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "Ü"c, [iS] + iL - 1, iL, CompareOptions.Ordinal))
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, [iS], iL, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "ü"c, [iS] + iL - 1, iL, CompareOptions.Ordinal))
      Console.WriteLine("IgnoreCase    : {0}{1}{2}", myT1, myStr.Substring([iS], iL), myT2)
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), [iS] + iL - 1, iL, CompareOptions.IgnoreCase))
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), [iS] + iL - 1, iL, CompareOptions.IgnoreCase))
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "Ü"c, [iS] + iL - 1, iL, CompareOptions.IgnoreCase))
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, [iS], iL, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "ü"c, [iS] + iL - 1, iL, CompareOptions.IgnoreCase))

   End Sub 'Main

   Public Shared Sub PrintMarker(Prefix As [String], First As Integer, Last As Integer)

      ' Determines the size of the array to create.
      Dim mySize As Integer
      If Last > First Then
         mySize = Last
      Else
         mySize = First
      End If 

      If mySize > - 1 Then

         ' Creates an array of Char to hold the markers.
         Dim myCharArr(mySize + 1) As [Char]

         ' Inserts the appropriate markers.
         If First > - 1 Then
            myCharArr(First) = "f"c
         End If
         If Last > - 1 Then
            myCharArr(Last) = "l"c
         End If
         If First = Last Then
            myCharArr(First) = "b"c
         End If 

         ' Displays the array of Char as a String.
         Console.WriteLine("{0}{1}", Prefix, New [String](myCharArr))

      Else
         Console.WriteLine(Prefix)

      End If 

   End Sub 'PrintMarker

End Class 'SamplesCompareInfo 


'This code produces the following output.
'
'Original      : Is AE or ae the same as Æ or æ?
'No options    : -------- ae the same as Æ -----
'           AE :                         b
'           ae :          b
'            Æ :                         b
'            æ :          b
'Ordinal       : -------- ae the same as Æ -----
'           AE :
'           ae :          b
'            Æ :                         b
'            æ :
'IgnoreCase    : -------- ae the same as Æ -----
'           AE :          f              l
'           ae :          f              l
'            Æ :          f              l
'            æ :          f              l
'
'Original      : Is U" or u" the same as Ü or ü?
'No options    : -------- u" the same as Ü -----
'           U" :                         b
'           u" :          b
'            Ü :                         b
'            ü :          b
'Ordinal       : -------- u" the same as Ü -----
'           U" :
'           u" :          b
'            Ü :                         b
'            ü :
'IgnoreCase    : -------- u" the same as Ü -----
'           U" :          f              l
'           u" :          f              l
'            Ü :          f              l
'            ü :          f              l

Commenti

La stringa di origine viene cercata all' startIndex indietro a partire startIndex da e termina con - count + 1.The source string is searched backward starting at startIndex and ending at startIndex - count + 1.

Questo overload esegue una ricerca con distinzione delle impostazioni cultura.This overload performs a culture-sensitive search. Se il carattere è un valore Unicode che rappresenta un carattere precomposto, ad esempio la legatura "Æ" (U + 00C6), può essere considerato equivalente a qualsiasi occorrenza dei componenti nella sequenza corretta, ad esempio "AE" (U + 0041, U + 0045), a seconda delle impostazioni cultura.If the character is a Unicode value representing a precomposed character, such as the ligature "Æ" (U+00C6), it might be considered equivalent to any occurrence of its components in the correct sequence, such as "AE" (U+0041, U+0045), depending on the culture. Per eseguire una ricerca ordinale (indipendente dalle impostazioni cultura), in cui un carattere viene considerato equivalente a un altro carattere solo se i valori Unicode sono uguali, è necessario chiamare uno degli overload con un parametro di tipo CompareOptions e usare il metodo Ordinal valore.To perform an ordinal (culture-insensitive) search, where a character is considered equivalent to another character only if the Unicode values are the same, you should call one of the overloads that has a parameter of type CompareOptions and use the Ordinal value. Gli overload di String.LastIndexOf che cercano un carattere eseguono una ricerca ordinale, mentre quelli che cercano una stringa eseguono una ricerca con distinzione delle impostazioni cultura.Overloads of String.LastIndexOf that search for a character perform an ordinal search, whereas those that search for a string perform a culture-sensitive search.

Nota

Quando possibile, è necessario chiamare i metodi di confronto tra stringhe con un parametro CompareOptions di tipo per specificare il tipo di confronto previsto.When possible, you should call string comparison methods that have a parameter of type CompareOptions to specify the kind of comparison expected. Come regola generale, usare le opzioni linguistiche (usando le impostazioni cultura correnti) per confrontare le stringhe visualizzate nell'interfaccia utente CompareOptions.Ordinal e CompareOptions.OrdinalIgnoreCase specificare o per i confronti di sicurezza.As a general rule, use linguistic options (using the current culture) for comparing strings displayed in the user interface and specify CompareOptions.Ordinal or CompareOptions.OrdinalIgnoreCase for security comparisons.

Note per i chiamanti

I set di caratteri includono caratteri ignorabili, ovvero caratteri che non vengono considerati quando si esegue un ordinamento linguistico o con distinzione delle impostazioni cultura.Character sets include ignorable characters, which are characters that are not considered when performing a linguistic or culture-sensitive sort. In una ricerca dipendente dalle impostazioni cultura, value se è un carattere ignorabile, il risultato è equivalente alla ricerca con il carattere rimosso.In a culture-sensitive search, if value is an ignorable character, the result is equivalent to searching with that character removed. In questo caso, il LastIndexOf(String, Char, Int32, Int32) metodo restituisce startIndexsempre, ovvero la posizione del carattere in cui inizia la ricerca.In this case, the LastIndexOf(String, Char, Int32, Int32) method always returns startIndex, which is the character position at which the search begins. Nell'esempio seguente viene usato il LastIndexOf(String, Char, Int32, Int32) metodo per trovare un segno meno (U + 00AD) che precede la "m" finale in due stringhe.In the following example, the LastIndexOf(String, Char, Int32, Int32) method is used to find a soft hyphen (U+00AD) that precedes the final "m" in two strings. Solo una delle stringhe contiene un segno meno facoltativo.Only one of the strings contains a soft hyphen. In entrambi i casi, poiché il trattino Soft è un carattere ignorabile, il metodo restituisce la posizione di indice della "m", che è il startIndexvalore di.In both cases, because the soft hyphen is an ignorable character, the method returns the index position of the "m", which is the value of startIndex.

[!code-csharpSystem.Globalization.CompareInfo.LastIndexOf#9] [!code-vbSystem.Globalization.CompareInfo.LastIndexOf#9][!code-csharpSystem.Globalization.CompareInfo.LastIndexOf#9] [!code-vbSystem.Globalization.CompareInfo.LastIndexOf#9]

Vedi anche

LastIndexOf(String, Char, Int32, CompareOptions) LastIndexOf(String, Char, Int32, CompareOptions) LastIndexOf(String, Char, Int32, CompareOptions) LastIndexOf(String, Char, Int32, CompareOptions)

Cerca il carattere specificato e restituisce l'indice in base zero dell'ultima occorrenza all'interno della sezione della stringa di origine compresa tra l'inizio della stringa e l'indice specificato, usando il valore CompareOptions specificato.Searches for the specified character and returns the zero-based index of the last occurrence within the section of the source string that extends from the beginning of the string to the specified index using the specified CompareOptions value.

public:
 virtual int LastIndexOf(System::String ^ source, char value, int startIndex, System::Globalization::CompareOptions options);
public virtual int LastIndexOf (string source, char value, int startIndex, System.Globalization.CompareOptions options);
abstract member LastIndexOf : string * char * int * System.Globalization.CompareOptions -> int
override this.LastIndexOf : string * char * int * System.Globalization.CompareOptions -> int
Public Overridable Function LastIndexOf (source As String, value As Char, startIndex As Integer, options As CompareOptions) As Integer

Parametri

source
String String String String

Stringa in cui effettuare la ricerca.The string to search.

value
Char Char Char Char

Carattere da individuare all'interno di source.The character to locate within source.

startIndex
Int32 Int32 Int32 Int32

Indice iniziale in base zero della ricerca all'indietro.The zero-based starting index of the backward search.

options
CompareOptions CompareOptions CompareOptions CompareOptions

Valore che definisce la modalità di confronto di source e value.A value that defines how source and value should be compared. options è il valore di enumerazione Ordinal o la combinazione bit per bit di uno o più dei seguenti valori: IgnoreCase, IgnoreSymbols, IgnoreNonSpace, IgnoreWidth e IgnoreKanaType.options is either the enumeration value Ordinal, or a bitwise combination of one or more of the following values: IgnoreCase, IgnoreSymbols, IgnoreNonSpace, IgnoreWidth, and IgnoreKanaType.

Restituisce

Indice in base zero dell'ultima occorrenza di value, se presente, all'interno della sezione di source compresa tra l'inizio di source e startIndex, usando le opzioni di confronto specificate; in caso contrario, -1.The zero-based index of the last occurrence of value, if found, within the section of source that extends from the beginning of source to startIndex, using the specified comparison options; otherwise, -1. Restituisce startIndex se value è un carattere che è possibile ignorare.Returns startIndex if value is an ignorable character.

Eccezioni

startIndex non è compreso nell'intervallo di indici validi per source.startIndex is outside the range of valid indexes for source.

options contiene un valore di CompareOptions non valido.options contains an invalid CompareOptions value.

Esempi

Nell'esempio seguente vengono determinati gli indici della prima e dell'ultima occorrenza di un carattere o di una sottostringa all'interno di una parte di una stringa.The following example determines the indexes of the first and last occurrences of a character or a substring within a portion of a string. Si noti IndexOf che LastIndexOf e eseguono la ricerca in parti diverse della stringa, anche con lo startIndex stesso parametro.Note that IndexOf and LastIndexOf are searching in different portions of the string, even with the same startIndex parameter.

using namespace System;
using namespace System::Globalization;
void PrintMarker( String^ Prefix, int First, int Last )
{
   
   // Determines the size of the array to create.
   int mySize;
   if ( Last > First )
      mySize = Last;
   else
      mySize = First;

   if ( mySize > -1 )
   {
      
      // Creates an array of Char to hold the markers.
      array<Char>^myCharArr = gcnew array<Char>(mySize + 1);
      
      // Inserts the appropriate markers.
      if ( First > -1 )
            myCharArr[ First ] = 'f';
      if ( Last > -1 )
            myCharArr[ Last ] = 'l';
      if ( First == Last )
            myCharArr[ First ] = 'b';
      
      // Displays the array of Char as a String.
      Console::WriteLine( "{0}{1}", Prefix, gcnew String( myCharArr ) );
   }
   else
      Console::WriteLine( Prefix );
}

int main()
{
   
   // Creates CompareInfo for the InvariantCulture.
   CompareInfo^ myComp = CultureInfo::InvariantCulture->CompareInfo;
   
   // iS is the starting index of the substring.
   int iS = 20;
   
   // myT1 is the string used for padding.
   String^ myT1;
   
   // Searches for the ligature Æ.
   String^ myStr = "Is AE or ae the same as Æ or æ?";
   Console::WriteLine();
   myT1 = gcnew String( '-',iS );
   Console::WriteLine( "IndexOf( String, *, {0}, * )", iS );
   Console::WriteLine( "Original      : {0}", myStr );
   Console::WriteLine( "No options    : {0}{1}", myT1, myStr->Substring( iS ) );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", iS ), -1 );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", iS ), -1 );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', iS ), -1 );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', iS ), -1 );
   Console::WriteLine( "Ordinal       : {0}{1}", myT1, myStr->Substring( iS ) );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", iS, CompareOptions::Ordinal ), -1 );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", iS, CompareOptions::Ordinal ), -1 );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', iS, CompareOptions::Ordinal ), -1 );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', iS, CompareOptions::Ordinal ), -1 );
   Console::WriteLine( "IgnoreCase    : {0}{1}", myT1, myStr->Substring( iS ) );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", iS, CompareOptions::IgnoreCase ), -1 );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", iS, CompareOptions::IgnoreCase ), -1 );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', iS, CompareOptions::IgnoreCase ), -1 );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', iS, CompareOptions::IgnoreCase ), -1 );
   myT1 = gcnew String( '-',myStr->Length - iS - 1 );
   Console::WriteLine( "LastIndexOf( String, *, {0}, * )", iS );
   Console::WriteLine( "Original      : {0}", myStr );
   Console::WriteLine( "No options    : {0}{1}", myStr->Substring( 0, iS + 1 ), myT1 );
   PrintMarker( "           AE : ", -1, myComp->LastIndexOf( myStr, "AE", iS ) );
   PrintMarker( "           ae : ", -1, myComp->LastIndexOf( myStr, "ae", iS ) );
   PrintMarker( "            Æ : ", -1, myComp->LastIndexOf( myStr, L'Æ', iS ) );
   PrintMarker( "            æ : ", -1, myComp->LastIndexOf( myStr, L'æ', iS ) );
   Console::WriteLine( "Ordinal       : {0}{1}", myStr->Substring( 0, iS + 1 ), myT1 );
   PrintMarker( "           AE : ", -1, myComp->LastIndexOf( myStr, "AE", iS, CompareOptions::Ordinal ) );
   PrintMarker( "           ae : ", -1, myComp->LastIndexOf( myStr, "ae", iS, CompareOptions::Ordinal ) );
   PrintMarker( "            Æ : ", -1, myComp->LastIndexOf( myStr, L'Æ', iS, CompareOptions::Ordinal ) );
   PrintMarker( "            æ : ", -1, myComp->LastIndexOf( myStr, L'æ', iS, CompareOptions::Ordinal ) );
   Console::WriteLine( "IgnoreCase    : {0}{1}", myStr->Substring( 0, iS + 1 ), myT1 );
   PrintMarker( "           AE : ", -1, myComp->LastIndexOf( myStr, "AE", iS, CompareOptions::IgnoreCase ) );
   PrintMarker( "           ae : ", -1, myComp->LastIndexOf( myStr, "ae", iS, CompareOptions::IgnoreCase ) );
   PrintMarker( "            Æ : ", -1, myComp->LastIndexOf( myStr, L'Æ', iS, CompareOptions::IgnoreCase ) );
   PrintMarker( "            æ : ", -1, myComp->LastIndexOf( myStr, L'æ', iS, CompareOptions::IgnoreCase ) );
   
   // Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
   myStr = "Is U\u0308 or u\u0308 the same as \u00DC or \u00FC?";
   Console::WriteLine();
   myT1 = gcnew String( '-',iS );
   Console::WriteLine( "IndexOf( String, *, {0}, * )", iS );
   Console::WriteLine( "Original      : {0}", myStr );
   Console::WriteLine( "No options    : {0}{1}", myT1, myStr->Substring( iS ) );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", iS ), -1 );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", iS ), -1 );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', iS ), -1 );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', iS ), -1 );
   Console::WriteLine( "Ordinal       : {0}{1}", myT1, myStr->Substring( iS ) );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", iS, CompareOptions::Ordinal ), -1 );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", iS, CompareOptions::Ordinal ), -1 );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', iS, CompareOptions::Ordinal ), -1 );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', iS, CompareOptions::Ordinal ), -1 );
   Console::WriteLine( "IgnoreCase    : {0}{1}", myT1, myStr->Substring( iS ) );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", iS, CompareOptions::IgnoreCase ), -1 );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", iS, CompareOptions::IgnoreCase ), -1 );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', iS, CompareOptions::IgnoreCase ), -1 );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', iS, CompareOptions::IgnoreCase ), -1 );
   myT1 = gcnew String( '-',myStr->Length - iS - 1 );
   Console::WriteLine( "LastIndexOf( String, *, {0}, * )", iS );
   Console::WriteLine( "Original      : {0}", myStr );
   Console::WriteLine( "No options    : {0}{1}", myStr->Substring( 0, iS + 1 ), myT1 );
   PrintMarker( "           U\u0308 : ", -1, myComp->LastIndexOf( myStr, "U\u0308", iS ) );
   PrintMarker( "           u\u0308 : ", -1, myComp->LastIndexOf( myStr, "u\u0308", iS ) );
   PrintMarker( "            Ü : ", -1, myComp->LastIndexOf( myStr, L'Ü', iS ) );
   PrintMarker( "            ü : ", -1, myComp->LastIndexOf( myStr, L'ü', iS ) );
   Console::WriteLine( "Ordinal       : {0}{1}", myStr->Substring( 0, iS + 1 ), myT1 );
   PrintMarker( "           U\u0308 : ", -1, myComp->LastIndexOf( myStr, "U\u0308", iS, CompareOptions::Ordinal ) );
   PrintMarker( "           u\u0308 : ", -1, myComp->LastIndexOf( myStr, "u\u0308", iS, CompareOptions::Ordinal ) );
   PrintMarker( "            Ü : ", -1, myComp->LastIndexOf( myStr, L'Ü', iS, CompareOptions::Ordinal ) );
   PrintMarker( "            ü : ", -1, myComp->LastIndexOf( myStr, L'ü', iS, CompareOptions::Ordinal ) );
   Console::WriteLine( "IgnoreCase    : {0}{1}", myStr->Substring( 0, iS + 1 ), myT1 );
   PrintMarker( "           U\u0308 : ", -1, myComp->LastIndexOf( myStr, "U\u0308", iS, CompareOptions::IgnoreCase ) );
   PrintMarker( "           u\u0308 : ", -1, myComp->LastIndexOf( myStr, "u\u0308", iS, CompareOptions::IgnoreCase ) );
   PrintMarker( "            Ü : ", -1, myComp->LastIndexOf( myStr, L'Ü', iS, CompareOptions::IgnoreCase ) );
   PrintMarker( "            ü : ", -1, myComp->LastIndexOf( myStr, L'ü', iS, CompareOptions::IgnoreCase ) );
}

/*
This code produces the following output.

IndexOf( String, *, 20, * )
Original      : Is AE or ae the same as Æ or æ?
No options    : -------------------- as Æ or æ?
           AE :                         f
           ae :                              f
            Æ :                         f
            æ :                              f
Ordinal       : -------------------- as Æ or æ?
           AE :
           ae :
            Æ :                         f
            æ :                              f
IgnoreCase    : -------------------- as Æ or æ?
           AE :                         f
           ae :                         f
            Æ :                         f
            æ :                         f
LastIndexOf( String, *, 20, * )
Original      : Is AE or ae the same as Æ or æ?
No options    : Is AE or ae the same ----------
           AE :    l
           ae :          l
            Æ :    l
            æ :          l
Ordinal       : Is AE or ae the same ----------
           AE :    l
           ae :          l
            Æ :
            æ :
IgnoreCase    : Is AE or ae the same ----------
           AE :          l
           ae :          l
            Æ :          l
            æ :          l

IndexOf( String, *, 20, * )
Original      : Is U" or u" the same as Ü or ü?
No options    : -------------------- as Ü or ü?
           U" :                         f
           u" :                              f
            Ü :                         f
            ü :                              f
Ordinal       : -------------------- as Ü or ü?
           U" :
           u" :
            Ü :                         f
            ü :                              f
IgnoreCase    : -------------------- as Ü or ü?
           U" :                         f
           u" :                         f
            Ü :                         f
            ü :                         f
LastIndexOf( String, *, 20, * )
Original      : Is U" or u" the same as Ü or ü?
No options    : Is U" or u" the same ----------
           U" :    l
           u" :          l
            Ü :    l
            ü :          l
Ordinal       : Is U" or u" the same ----------
           U" :    l
           u" :          l
            Ü :
            ü :
IgnoreCase    : Is U" or u" the same ----------
           U" :          l
           u" :          l
            Ü :          l
            ü :          l

*/
using System;
using System.Globalization;

public class SamplesCompareInfo  {

   public static void Main()  {

      // Creates CompareInfo for the InvariantCulture.
      CompareInfo myComp = CultureInfo.InvariantCulture.CompareInfo;

      // iS is the starting index of the substring.
      int iS = 20;
      // myT1 is the string used for padding.
      String myT1;

      // Searches for the ligature Æ.
      String myStr = "Is AE or ae the same as Æ or æ?";
      Console.WriteLine();

      myT1 = new String( '-', iS );
      Console.WriteLine( "IndexOf( String, *, {0}, * )", iS );
      Console.WriteLine( "Original      : {0}", myStr );
      Console.WriteLine( "No options    : {0}{1}", myT1, myStr.Substring( iS ) );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", iS ), -1 );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", iS ), -1 );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', iS ), -1 );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', iS ), -1 );
      Console.WriteLine( "Ordinal       : {0}{1}", myT1, myStr.Substring( iS ) );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", iS, CompareOptions.Ordinal ), -1 );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", iS, CompareOptions.Ordinal ), -1 );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', iS, CompareOptions.Ordinal ), -1 );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', iS, CompareOptions.Ordinal ), -1 );
      Console.WriteLine( "IgnoreCase    : {0}{1}", myT1, myStr.Substring( iS ) );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", iS, CompareOptions.IgnoreCase ), -1 );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", iS, CompareOptions.IgnoreCase ), -1 );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', iS, CompareOptions.IgnoreCase ), -1 );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', iS, CompareOptions.IgnoreCase ), -1 );

      myT1 = new String( '-', myStr.Length - iS - 1 );
      Console.WriteLine( "LastIndexOf( String, *, {0}, * )", iS );
      Console.WriteLine( "Original      : {0}", myStr );
      Console.WriteLine( "No options    : {0}{1}", myStr.Substring( 0, iS + 1 ), myT1 );
      PrintMarker( "           AE : ", -1, myComp.LastIndexOf( myStr, "AE", iS ) );
      PrintMarker( "           ae : ", -1, myComp.LastIndexOf( myStr, "ae", iS ) );
      PrintMarker( "            Æ : ", -1, myComp.LastIndexOf( myStr, 'Æ', iS ) );
      PrintMarker( "            æ : ", -1, myComp.LastIndexOf( myStr, 'æ', iS ) );
      Console.WriteLine( "Ordinal       : {0}{1}", myStr.Substring( 0, iS + 1 ), myT1 );
      PrintMarker( "           AE : ", -1, myComp.LastIndexOf( myStr, "AE", iS, CompareOptions.Ordinal ) );
      PrintMarker( "           ae : ", -1, myComp.LastIndexOf( myStr, "ae", iS, CompareOptions.Ordinal ) );
      PrintMarker( "            Æ : ", -1, myComp.LastIndexOf( myStr, 'Æ', iS, CompareOptions.Ordinal ) );
      PrintMarker( "            æ : ", -1, myComp.LastIndexOf( myStr, 'æ', iS, CompareOptions.Ordinal ) );
      Console.WriteLine( "IgnoreCase    : {0}{1}", myStr.Substring( 0, iS + 1 ), myT1 );
      PrintMarker( "           AE : ", -1, myComp.LastIndexOf( myStr, "AE", iS, CompareOptions.IgnoreCase ) );
      PrintMarker( "           ae : ", -1, myComp.LastIndexOf( myStr, "ae", iS, CompareOptions.IgnoreCase ) );
      PrintMarker( "            Æ : ", -1, myComp.LastIndexOf( myStr, 'Æ', iS, CompareOptions.IgnoreCase ) );
      PrintMarker( "            æ : ", -1, myComp.LastIndexOf( myStr, 'æ', iS, CompareOptions.IgnoreCase ) );

      // Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
      myStr = "Is \u0055\u0308 or \u0075\u0308 the same as \u00DC or \u00FC?";
      Console.WriteLine();

      myT1 = new String( '-', iS );
      Console.WriteLine( "IndexOf( String, *, {0}, * )", iS );
      Console.WriteLine( "Original      : {0}", myStr );
      Console.WriteLine( "No options    : {0}{1}", myT1, myStr.Substring( iS ) );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", iS ), -1 );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", iS ), -1 );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', iS ), -1 );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', iS ), -1 );
      Console.WriteLine( "Ordinal       : {0}{1}", myT1, myStr.Substring( iS ) );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", iS, CompareOptions.Ordinal ), -1 );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", iS, CompareOptions.Ordinal ), -1 );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', iS, CompareOptions.Ordinal ), -1 );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', iS, CompareOptions.Ordinal ), -1 );
      Console.WriteLine( "IgnoreCase    : {0}{1}", myT1, myStr.Substring( iS ) );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", iS, CompareOptions.IgnoreCase ), -1 );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", iS, CompareOptions.IgnoreCase ), -1 );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', iS, CompareOptions.IgnoreCase ), -1 );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', iS, CompareOptions.IgnoreCase ), -1 );

      myT1 = new String( '-', myStr.Length - iS - 1 );
      Console.WriteLine( "LastIndexOf( String, *, {0}, * )", iS );
      Console.WriteLine( "Original      : {0}", myStr );
      Console.WriteLine( "No options    : {0}{1}", myStr.Substring( 0, iS + 1 ), myT1 );
      PrintMarker( "           U\u0308 : ", -1, myComp.LastIndexOf( myStr, "U\u0308", iS ) );
      PrintMarker( "           u\u0308 : ", -1, myComp.LastIndexOf( myStr, "u\u0308", iS ) );
      PrintMarker( "            Ü : ", -1, myComp.LastIndexOf( myStr, 'Ü', iS ) );
      PrintMarker( "            ü : ", -1, myComp.LastIndexOf( myStr, 'ü', iS ) );
      Console.WriteLine( "Ordinal       : {0}{1}", myStr.Substring( 0, iS + 1 ), myT1 );
      PrintMarker( "           U\u0308 : ", -1, myComp.LastIndexOf( myStr, "U\u0308", iS, CompareOptions.Ordinal ) );
      PrintMarker( "           u\u0308 : ", -1, myComp.LastIndexOf( myStr, "u\u0308", iS, CompareOptions.Ordinal ) );
      PrintMarker( "            Ü : ", -1, myComp.LastIndexOf( myStr, 'Ü', iS, CompareOptions.Ordinal ) );
      PrintMarker( "            ü : ", -1, myComp.LastIndexOf( myStr, 'ü', iS, CompareOptions.Ordinal ) );
      Console.WriteLine( "IgnoreCase    : {0}{1}", myStr.Substring( 0, iS + 1 ), myT1 );
      PrintMarker( "           U\u0308 : ", -1, myComp.LastIndexOf( myStr, "U\u0308", iS, CompareOptions.IgnoreCase ) );
      PrintMarker( "           u\u0308 : ", -1, myComp.LastIndexOf( myStr, "u\u0308", iS, CompareOptions.IgnoreCase ) );
      PrintMarker( "            Ü : ", -1, myComp.LastIndexOf( myStr, 'Ü', iS, CompareOptions.IgnoreCase ) );
      PrintMarker( "            ü : ", -1, myComp.LastIndexOf( myStr, 'ü', iS, CompareOptions.IgnoreCase ) );

   }

   public static void PrintMarker( String Prefix, int First, int Last )  {

      // Determines the size of the array to create.
      int mySize;
      if ( Last > First )
         mySize = Last;
      else
         mySize = First;

      if ( mySize > -1 )  {

         // Creates an array of Char to hold the markers.
         Char[] myCharArr = new Char[mySize+1];

         // Inserts the appropriate markers.
         if ( First > -1 )
         myCharArr[First] = 'f';
         if ( Last > -1 )
            myCharArr[Last] = 'l';
         if ( First == Last )
         myCharArr[First] = 'b';

         // Displays the array of Char as a String.
         Console.WriteLine( "{0}{1}", Prefix, new String( myCharArr ) );

      }
      else
         Console.WriteLine( Prefix );

   }

}


/*
This code produces the following output.

IndexOf( String, *, 20, * )
Original      : Is AE or ae the same as Æ or æ?
No options    : -------------------- as Æ or æ?
           AE :                         f
           ae :                              f
            Æ :                         f
            æ :                              f
Ordinal       : -------------------- as Æ or æ?
           AE :
           ae :
            Æ :                         f
            æ :                              f
IgnoreCase    : -------------------- as Æ or æ?
           AE :                         f
           ae :                         f
            Æ :                         f
            æ :                         f
LastIndexOf( String, *, 20, * )
Original      : Is AE or ae the same as Æ or æ?
No options    : Is AE or ae the same ----------
           AE :    l
           ae :          l
            Æ :    l
            æ :          l
Ordinal       : Is AE or ae the same ----------
           AE :    l
           ae :          l
            Æ :
            æ :
IgnoreCase    : Is AE or ae the same ----------
           AE :          l
           ae :          l
            Æ :          l
            æ :          l

IndexOf( String, *, 20, * )
Original      : Is U" or u" the same as Ü or ü?
No options    : -------------------- as Ü or ü?
           U" :                         f
           u" :                              f
            Ü :                         f
            ü :                              f
Ordinal       : -------------------- as Ü or ü?
           U" :
           u" :
            Ü :                         f
            ü :                              f
IgnoreCase    : -------------------- as Ü or ü?
           U" :                         f
           u" :                         f
            Ü :                         f
            ü :                         f
LastIndexOf( String, *, 20, * )
Original      : Is U" or u" the same as Ü or ü?
No options    : Is U" or u" the same ----------
           U" :    l
           u" :          l
            Ü :    l
            ü :          l
Ordinal       : Is U" or u" the same ----------
           U" :    l
           u" :          l
            Ü :
            ü :
IgnoreCase    : Is U" or u" the same ----------
           U" :          l
           u" :          l
            Ü :          l
            ü :          l

*/
Imports System
Imports System.Globalization
Imports Microsoft.VisualBasic

Public Class SamplesCompareInfo

   Public Shared Sub Main()

      ' Creates CompareInfo for the InvariantCulture.
      Dim myComp As CompareInfo = CultureInfo.InvariantCulture.CompareInfo

      ' iS is the starting index of the substring.
      Dim [iS] As Integer = 20
      ' myT1 is the string used for padding.
      Dim myT1 As [String]

      ' Searches for the ligature Æ.
      Dim myStr As [String] = "Is AE or ae the same as Æ or æ?"
      Console.WriteLine()

      myT1 = New [String]("-"c, [iS])
      Console.WriteLine("IndexOf( String, *, {0}, * )", [iS])
      Console.WriteLine("Original      : {0}", myStr)
      Console.WriteLine("No options    : {0}{1}", myT1, myStr.Substring([iS]))
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", [iS]), - 1)
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", [iS]), - 1)
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, [iS]), - 1)
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, [iS]), - 1)
      Console.WriteLine("Ordinal       : {0}{1}", myT1, myStr.Substring([iS]))
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", [iS], CompareOptions.Ordinal), - 1)
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", [iS], CompareOptions.Ordinal), - 1)
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, [iS], CompareOptions.Ordinal), - 1)
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, [iS], CompareOptions.Ordinal), - 1)
      Console.WriteLine("IgnoreCase    : {0}{1}", myT1, myStr.Substring([iS]))
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", [iS], CompareOptions.IgnoreCase), - 1)
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", [iS], CompareOptions.IgnoreCase), - 1)
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, [iS], CompareOptions.IgnoreCase), - 1)
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, [iS], CompareOptions.IgnoreCase), - 1)

      myT1 = New [String]("-"c, myStr.Length - [iS] - 1)
      Console.WriteLine("LastIndexOf( String, *, {0}, * )", [iS])
      Console.WriteLine("Original      : {0}", myStr)
      Console.WriteLine("No options    : {0}{1}", myStr.Substring(0, [iS] + 1), myT1)
      PrintMarker("           AE : ", - 1, myComp.LastIndexOf(myStr, "AE", [iS]))
      PrintMarker("           ae : ", - 1, myComp.LastIndexOf(myStr, "ae", [iS]))
      PrintMarker("            Æ : ", - 1, myComp.LastIndexOf(myStr, "Æ"c, [iS]))
      PrintMarker("            æ : ", - 1, myComp.LastIndexOf(myStr, "æ"c, [iS]))
      Console.WriteLine("Ordinal       : {0}{1}", myStr.Substring(0, [iS] + 1), myT1)
      PrintMarker("           AE : ", - 1, myComp.LastIndexOf(myStr, "AE", [iS], CompareOptions.Ordinal))
      PrintMarker("           ae : ", - 1, myComp.LastIndexOf(myStr, "ae", [iS], CompareOptions.Ordinal))
      PrintMarker("            Æ : ", - 1, myComp.LastIndexOf(myStr, "Æ"c, [iS], CompareOptions.Ordinal))
      PrintMarker("            æ : ", - 1, myComp.LastIndexOf(myStr, "æ"c, [iS], CompareOptions.Ordinal))
      Console.WriteLine("IgnoreCase    : {0}{1}", myStr.Substring(0, [iS] + 1), myT1)
      PrintMarker("           AE : ", - 1, myComp.LastIndexOf(myStr, "AE", [iS], CompareOptions.IgnoreCase))
      PrintMarker("           ae : ", - 1, myComp.LastIndexOf(myStr, "ae", [iS], CompareOptions.IgnoreCase))
      PrintMarker("            Æ : ", - 1, myComp.LastIndexOf(myStr, "Æ"c, [iS], CompareOptions.IgnoreCase))
      PrintMarker("            æ : ", - 1, myComp.LastIndexOf(myStr, "æ"c, [iS], CompareOptions.IgnoreCase))

      ' Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
      myStr = "Is " & ChrW(&H0055) & ChrW(&H0308) & " or " & ChrW(&H0075) & ChrW(&H0308) & " the same as " & ChrW(&H00DC) & " or " & ChrW(&H00FC) & "?"
      Console.WriteLine()

      myT1 = New [String]("-"c, [iS])
      Console.WriteLine("IndexOf( String, *, {0}, * )", [iS])
      Console.WriteLine("Original      : {0}", myStr)
      Console.WriteLine("No options    : {0}{1}", myT1, myStr.Substring([iS]))
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), [iS]), - 1)
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), [iS]), - 1)
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, [iS]), - 1)
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, [iS]), - 1)
      Console.WriteLine("Ordinal       : {0}{1}", myT1, myStr.Substring([iS]))
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), [iS], CompareOptions.Ordinal), - 1)
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), [iS], CompareOptions.Ordinal), - 1)
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, [iS], CompareOptions.Ordinal), - 1)
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, [iS], CompareOptions.Ordinal), - 1)
      Console.WriteLine("IgnoreCase    : {0}{1}", myT1, myStr.Substring([iS]))
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), [iS], CompareOptions.IgnoreCase), - 1)
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), [iS], CompareOptions.IgnoreCase), - 1)
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, [iS], CompareOptions.IgnoreCase), - 1)
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, [iS], CompareOptions.IgnoreCase), - 1)

      myT1 = New [String]("-"c, myStr.Length - [iS] - 1)
      Console.WriteLine("LastIndexOf( String, *, {0}, * )", [iS])
      Console.WriteLine("Original      : {0}", myStr)
      Console.WriteLine("No options    : {0}{1}", myStr.Substring(0, [iS] + 1), myT1)
      PrintMarker("           U" & ChrW(&H0308) & " : ", - 1, myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), [iS]))
      PrintMarker("           u" & ChrW(&H0308) & " : ", - 1, myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), [iS]))
      PrintMarker("            Ü : ", - 1, myComp.LastIndexOf(myStr, "Ü"c, [iS]))
      PrintMarker("            ü : ", - 1, myComp.LastIndexOf(myStr, "ü"c, [iS]))
      Console.WriteLine("Ordinal       : {0}{1}", myStr.Substring(0, [iS] + 1), myT1)
      PrintMarker("           U" & ChrW(&H0308) & " : ", - 1, myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), [iS], CompareOptions.Ordinal))
      PrintMarker("           u" & ChrW(&H0308) & " : ", - 1, myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), [iS], CompareOptions.Ordinal))
      PrintMarker("            Ü : ", - 1, myComp.LastIndexOf(myStr, "Ü"c, [iS], CompareOptions.Ordinal))
      PrintMarker("            ü : ", - 1, myComp.LastIndexOf(myStr, "ü"c, [iS], CompareOptions.Ordinal))
      Console.WriteLine("IgnoreCase    : {0}{1}", myStr.Substring(0, [iS] + 1), myT1)
      PrintMarker("           U" & ChrW(&H0308) & " : ", - 1, myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), [iS], CompareOptions.IgnoreCase))
      PrintMarker("           u" & ChrW(&H0308) & " : ", - 1, myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), [iS], CompareOptions.IgnoreCase))
      PrintMarker("            Ü : ", - 1, myComp.LastIndexOf(myStr, "Ü"c, [iS], CompareOptions.IgnoreCase))
      PrintMarker("            ü : ", - 1, myComp.LastIndexOf(myStr, "ü"c, [iS], CompareOptions.IgnoreCase))

   End Sub 'Main

   Public Shared Sub PrintMarker(Prefix As [String], First As Integer, Last As Integer)

      ' Determines the size of the array to create.
      Dim mySize As Integer
      If Last > First Then
         mySize = Last
      Else
         mySize = First
      End If 

      If mySize > - 1 Then

         ' Creates an array of Char to hold the markers.
         Dim myCharArr(mySize + 1) As [Char]

         ' Inserts the appropriate markers.
         If First > - 1 Then
            myCharArr(First) = "f"c
         End If
         If Last > - 1 Then
            myCharArr(Last) = "l"c
         End If
         If First = Last Then
            myCharArr(First) = "b"c
         End If 

         ' Displays the array of Char as a String.
         Console.WriteLine("{0}{1}", Prefix, New [String](myCharArr))
      
      Else
         Console.WriteLine(Prefix)

      End If 

   End Sub 'PrintMarker

End Class 'SamplesCompareInfo 


'This code produces the following output.
'
'IndexOf( String, *, 20, * )
'Original      : Is AE or ae the same as Æ or æ?
'No options    : -------------------- as Æ or æ?
'           AE :                         f
'           ae :                              f
'            Æ :                         f
'            æ :                              f
'Ordinal       : -------------------- as Æ or æ?
'           AE :
'           ae :
'            Æ :                         f
'            æ :                              f
'IgnoreCase    : -------------------- as Æ or æ?
'           AE :                         f
'           ae :                         f
'            Æ :                         f
'            æ :                         f
'LastIndexOf( String, *, 20, * )
'Original      : Is AE or ae the same as Æ or æ?
'No options    : Is AE or ae the same ----------
'           AE :    l
'           ae :          l
'            Æ :    l
'            æ :          l
'Ordinal       : Is AE or ae the same ----------
'           AE :    l
'           ae :          l
'            Æ :
'            æ :
'IgnoreCase    : Is AE or ae the same ----------
'           AE :          l
'           ae :          l
'            Æ :          l
'            æ :          l
'
'IndexOf( String, *, 20, * )
'Original      : Is U" or u" the same as Ü or ü?
'No options    : -------------------- as Ü or ü?
'           U" :                         f
'           u" :                              f
'            Ü :                         f
'            ü :                              f
'Ordinal       : -------------------- as Ü or ü?
'           U" :
'           u" :
'            Ü :                         f
'            ü :                              f
'IgnoreCase    : -------------------- as Ü or ü?
'           U" :                         f
'           u" :                         f
'            Ü :                         f
'            ü :                         f
'LastIndexOf( String, *, 20, * )
'Original      : Is U" or u" the same as Ü or ü?
'No options    : Is U" or u" the same ----------
'           U" :    l
'           u" :          l
'            Ü :    l
'            ü :          l
'Ordinal       : Is U" or u" the same ----------
'           U" :    l
'           u" :          l
'            Ü :
'            ü :
'IgnoreCase    : Is U" or u" the same ----------
'           U" :          l
'           u" :          l
'            Ü :          l
'            ü :          l

Commenti

La stringa di origine viene cercata all' startIndex indietro a partire da e termina all'inizio della stringa.The source string is searched backward starting at startIndex and ending at the beginning of the string.

Il CompareOptions.StringSort valore non è valido per questo metodo.The CompareOptions.StringSort value is not valid for this method.

Se options non include il Ordinal valore, questo overload esegue una ricerca con distinzione delle impostazioni cultura.If options does not include the Ordinal value, this overload performs a culture-sensitive search. Se il carattere è un valore Unicode che rappresenta un carattere precomposto, ad esempio la legatura "Æ" (U + 00C6), può essere considerato equivalente a qualsiasi occorrenza dei componenti nella sequenza corretta, ad esempio "AE" (U + 0041, U + 0045), a seconda delle impostazioni cultura.If the character is a Unicode value representing a precomposed character, such as the ligature "Æ" (U+00C6), it might be considered equivalent to any occurrence of its components in the correct sequence, such as "AE" (U+0041, U+0045), depending on the culture. Se options include il Ordinal valore, questo overload esegue una ricerca ordinale (indipendente dalle impostazioni cultura).If options includes the Ordinal value, this overload performs an ordinal (culture-insensitive) search. Un carattere viene considerato equivalente a un altro carattere solo se i valori Unicode sono uguali.A character is considered equivalent to another character only if the Unicode values are the same. Gli overload di String.LastIndexOf che cercano un carattere eseguono una ricerca ordinale, mentre quelli che cercano una stringa eseguono una ricerca con distinzione delle impostazioni cultura.Overloads of String.LastIndexOf that search for a character perform an ordinal search, whereas those that search for a string perform a culture-sensitive search.

Nota

Quando possibile, è necessario chiamare i metodi di confronto tra stringhe con un parametro CompareOptions di tipo per specificare il tipo di confronto previsto.When possible, you should call string comparison methods that have a parameter of type CompareOptions to specify the kind of comparison expected. Come regola generale, usare le opzioni linguistiche (usando le impostazioni cultura correnti) per confrontare le stringhe visualizzate nell'interfaccia utente CompareOptions.Ordinal e CompareOptions.OrdinalIgnoreCase specificare o per i confronti di sicurezza.As a general rule, use linguistic options (using the current culture) for comparing strings displayed in the user interface and specify CompareOptions.Ordinal or CompareOptions.OrdinalIgnoreCase for security comparisons.

Note per i chiamanti

I set di caratteri includono caratteri ignorabili, ovvero caratteri che non vengono considerati quando si esegue un ordinamento linguistico o con distinzione delle impostazioni cultura.Character sets include ignorable characters, which are characters that are not considered when performing a linguistic or culture-sensitive sort. In una ricerca dipendente dalle impostazioni cultura, value se è un carattere ignorabile, il risultato è equivalente alla ricerca con il carattere rimosso.In a culture-sensitive search, if value is an ignorable character, the result is equivalent to searching with that character removed. In questo caso, il LastIndexOf(String, Char, Int32, CompareOptions) metodo restituisce startIndexsempre, ovvero la posizione del carattere in cui inizia la ricerca.In this case, the LastIndexOf(String, Char, Int32, CompareOptions) method always returns startIndex, which is the character position at which the search begins. Nell'esempio seguente viene usato il LastIndexOf(String, Char, Int32, CompareOptions) metodo per trovare un segno meno (U + 00AD) che precede la "m" finale in due stringhe.In the following example, the LastIndexOf(String, Char, Int32, CompareOptions) method is used to find a soft hyphen (U+00AD) that precedes the final "m" in two strings. Solo una delle stringhe contiene un segno meno facoltativo.Only one of the strings contains a soft hyphen. In entrambi i casi, poiché il trattino Soft è un carattere ignorabile, una ricerca con distinzione delle impostazioni cultura restituisce la posizione di indice della "m".In both cases, because the soft hyphen is an ignorable character, a culture-sensitive search returns the index position of the "m". Una ricerca ordinale, tuttavia, trova correttamente il trattino morbido in una stringa e segnala che è assente dalla seconda stringa.An ordinal search, however, successfully finds the soft hyphen in one string and reports that it is absent from the second string.

[!code-csharpSystem.Globalization.CompareInfo.LastIndexOf#8] [!code-vbSystem.Globalization.CompareInfo.LastIndexOf#8][!code-csharpSystem.Globalization.CompareInfo.LastIndexOf#8] [!code-vbSystem.Globalization.CompareInfo.LastIndexOf#8]

Vedi anche

LastIndexOf(String, Char, CompareOptions) LastIndexOf(String, Char, CompareOptions) LastIndexOf(String, Char, CompareOptions) LastIndexOf(String, Char, CompareOptions)

Cerca il carattere specificato e restituisce l'indice in base zero dell'ultima occorrenza all'interno dell'intera stringa di origine usando il valore CompareOptions specificato.Searches for the specified character and returns the zero-based index of the last occurrence within the entire source string using the specified CompareOptions value.

public:
 virtual int LastIndexOf(System::String ^ source, char value, System::Globalization::CompareOptions options);
public virtual int LastIndexOf (string source, char value, System.Globalization.CompareOptions options);
abstract member LastIndexOf : string * char * System.Globalization.CompareOptions -> int
override this.LastIndexOf : string * char * System.Globalization.CompareOptions -> int
Public Overridable Function LastIndexOf (source As String, value As Char, options As CompareOptions) As Integer

Parametri

source
String String String String

Stringa in cui effettuare la ricerca.The string to search.

value
Char Char Char Char

Carattere da individuare all'interno di source.The character to locate within source.

options
CompareOptions CompareOptions CompareOptions CompareOptions

Valore che definisce la modalità di confronto di source e value.A value that defines how source and value should be compared. options è il valore di enumerazione Ordinal o la combinazione bit per bit di uno o più dei seguenti valori: IgnoreCase, IgnoreSymbols, IgnoreNonSpace, IgnoreWidth e IgnoreKanaType.options is either the enumeration value Ordinal, or a bitwise combination of one or more of the following values: IgnoreCase, IgnoreSymbols, IgnoreNonSpace, IgnoreWidth, and IgnoreKanaType.

Restituisce

Indice in base zero dell'ultima occorrenza di value se presente, all'interno di source usando le opzioni di confronto specificate; in caso contrario, -1.The zero-based index of the last occurrence of value, if found, within source, using the specified comparison options; otherwise, -1.

Eccezioni

options contiene un valore di CompareOptions non valido.options contains an invalid CompareOptions value.

Esempi

Nell'esempio seguente vengono determinati gli indici della prima e dell'ultima occorrenza di un carattere o di una sottostringa all'interno di una stringa.The following example determines the indexes of the first and last occurrences of a character or a substring within a string.

using namespace System;
using namespace System::Globalization;
void PrintMarker( String^ Prefix, int First, int Last )
{
   
   // Determines the size of the array to create.
   int mySize;
   if ( Last > First )
      mySize = Last;
   else
      mySize = First;

   if ( mySize > -1 )
   {
      
      // Creates an array of Char to hold the markers.
      array<Char>^myCharArr = gcnew array<Char>(mySize + 1);
      
      // Inserts the appropriate markers.
      if ( First > -1 )
            myCharArr[ First ] = 'f';
      if ( Last > -1 )
            myCharArr[ Last ] = 'l';
      if ( First == Last )
            myCharArr[ First ] = 'b';
      
      // Displays the array of Char as a String.
      Console::WriteLine( "{0}{1}", Prefix, gcnew String( myCharArr ) );
   }
   else
      Console::WriteLine( Prefix );
}

int main()
{
   
   // Creates CompareInfo for the InvariantCulture.
   CompareInfo^ myComp = CultureInfo::InvariantCulture->CompareInfo;
   
   // Searches for the ligature Æ.
   String^ myStr = "Is AE or ae the same as Æ or æ?";
   Console::WriteLine();
   Console::WriteLine( "No options    : {0}", myStr );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE" ), myComp->LastIndexOf( myStr, "AE" ) );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae" ), myComp->LastIndexOf( myStr, "ae" ) );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ' ), myComp->LastIndexOf( myStr, L'Æ' ) );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ' ), myComp->LastIndexOf( myStr, L'æ' ) );
   Console::WriteLine( "Ordinal       : {0}", myStr );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "AE", CompareOptions::Ordinal ) );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "ae", CompareOptions::Ordinal ) );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'Æ', CompareOptions::Ordinal ) );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'æ', CompareOptions::Ordinal ) );
   Console::WriteLine( "IgnoreCase    : {0}", myStr );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "AE", CompareOptions::IgnoreCase ) );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "ae", CompareOptions::IgnoreCase ) );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'Æ', CompareOptions::IgnoreCase ) );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'æ', CompareOptions::IgnoreCase ) );
   
   // Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
   myStr = "Is U\u0308 or u\u0308 the same as \u00DC or \u00FC?";
   Console::WriteLine();
   Console::WriteLine( "No options    : {0}", myStr );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308" ), myComp->LastIndexOf( myStr, "U\u0308" ) );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308" ), myComp->LastIndexOf( myStr, "u\u0308" ) );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü' ), myComp->LastIndexOf( myStr, L'Ü' ) );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü' ), myComp->LastIndexOf( myStr, L'ü' ) );
   Console::WriteLine( "Ordinal       : {0}", myStr );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "U\u0308", CompareOptions::Ordinal ) );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "u\u0308", CompareOptions::Ordinal ) );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'Ü', CompareOptions::Ordinal ) );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'ü', CompareOptions::Ordinal ) );
   Console::WriteLine( "IgnoreCase    : {0}", myStr );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "U\u0308", CompareOptions::IgnoreCase ) );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "u\u0308", CompareOptions::IgnoreCase ) );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'Ü', CompareOptions::IgnoreCase ) );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'ü', CompareOptions::IgnoreCase ) );
}

/*
This code produces the following output.

No options    : Is AE or ae the same as Æ or æ?
           AE :    f                    l
           ae :          f                   l
            Æ :    f                    l
            æ :          f                   l
Ordinal       : Is AE or ae the same as Æ or æ?
           AE :    b
           ae :          b
            Æ :                         b
            æ :                              b
IgnoreCase    : Is AE or ae the same as Æ or æ?
           AE :    f                         l
           ae :    f                         l
            Æ :    f                         l
            æ :    f                         l

No options    : Is U" or u" the same as Ü or ü?
           U" :    f                    l
           u" :          f                   l
            Ü :    f                    l
            ü :          f                   l
Ordinal       : Is U" or u" the same as Ü or ü?
           U" :    b
           u" :          b
            Ü :                         b
            ü :                              b
IgnoreCase    : Is U" or u" the same as Ü or ü?
           U" :    f                         l
           u" :    f                         l
            Ü :    f                         l
            ü :    f                         l

*/
using System;
using System.Globalization;

public class SamplesCompareInfo  {

   public static void Main()  {

      // Creates CompareInfo for the InvariantCulture.
      CompareInfo myComp = CultureInfo.InvariantCulture.CompareInfo;

      // Searches for the ligature Æ.
      String myStr = "Is AE or ae the same as Æ or æ?";
      Console.WriteLine();
      Console.WriteLine( "No options    : {0}", myStr );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE" ), myComp.LastIndexOf( myStr, "AE" ) );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae" ), myComp.LastIndexOf( myStr, "ae" ) );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ' ), myComp.LastIndexOf( myStr, 'Æ' ) );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ' ), myComp.LastIndexOf( myStr, 'æ' ) );
      Console.WriteLine( "Ordinal       : {0}", myStr );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "AE", CompareOptions.Ordinal ) );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "ae", CompareOptions.Ordinal ) );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'Æ', CompareOptions.Ordinal ) );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'æ', CompareOptions.Ordinal ) );
      Console.WriteLine( "IgnoreCase    : {0}", myStr );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "AE", CompareOptions.IgnoreCase ) );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "ae", CompareOptions.IgnoreCase ) );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'Æ', CompareOptions.IgnoreCase ) );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'æ', CompareOptions.IgnoreCase ) );

      // Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
      myStr = "Is \u0055\u0308 or \u0075\u0308 the same as \u00DC or \u00FC?";
      Console.WriteLine();
      Console.WriteLine( "No options    : {0}", myStr );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308" ), myComp.LastIndexOf( myStr, "U\u0308" ) );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308" ), myComp.LastIndexOf( myStr, "u\u0308" ) );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü' ), myComp.LastIndexOf( myStr, 'Ü' ) );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü' ), myComp.LastIndexOf( myStr, 'ü' ) );
      Console.WriteLine( "Ordinal       : {0}", myStr );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "U\u0308", CompareOptions.Ordinal ) );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "u\u0308", CompareOptions.Ordinal ) );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'Ü', CompareOptions.Ordinal ) );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'ü', CompareOptions.Ordinal ) );
      Console.WriteLine( "IgnoreCase    : {0}", myStr );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "U\u0308", CompareOptions.IgnoreCase ) );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "u\u0308", CompareOptions.IgnoreCase ) );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'Ü', CompareOptions.IgnoreCase ) );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'ü', CompareOptions.IgnoreCase ) );

   }

   public static void PrintMarker( String Prefix, int First, int Last )  {

      // Determines the size of the array to create.
      int mySize;
      if ( Last > First )
         mySize = Last;
      else
         mySize = First;

      if ( mySize > -1 )  {

         // Creates an array of Char to hold the markers.
         Char[] myCharArr = new Char[mySize+1];

         // Inserts the appropriate markers.
         if ( First > -1 )
         myCharArr[First] = 'f';
         if ( Last > -1 )
            myCharArr[Last] = 'l';
         if ( First == Last )
         myCharArr[First] = 'b';

         // Displays the array of Char as a String.
         Console.WriteLine( "{0}{1}", Prefix, new String( myCharArr ) );

      }
      else
         Console.WriteLine( Prefix );

   }

}


/*
This code produces the following output.

No options    : Is AE or ae the same as Æ or æ?
           AE :    f                    l
           ae :          f                   l
            Æ :    f                    l
            æ :          f                   l
Ordinal       : Is AE or ae the same as Æ or æ?
           AE :    b
           ae :          b
            Æ :                         b
            æ :                              b
IgnoreCase    : Is AE or ae the same as Æ or æ?
           AE :    f                         l
           ae :    f                         l
            Æ :    f                         l
            æ :    f                         l

No options    : Is U" or u" the same as Ü or ü?
           U" :    f                    l
           u" :          f                   l
            Ü :    f                    l
            ü :          f                   l
Ordinal       : Is U" or u" the same as Ü or ü?
           U" :    b
           u" :          b
            Ü :                         b
            ü :                              b
IgnoreCase    : Is U" or u" the same as Ü or ü?
           U" :    f                         l
           u" :    f                         l
            Ü :    f                         l
            ü :    f                         l

*/
Imports System
Imports System.Globalization
Imports Microsoft.VisualBasic

Public Class SamplesCompareInfo

   Public Shared Sub Main()

      ' Creates CompareInfo for the InvariantCulture.
      Dim myComp As CompareInfo = CultureInfo.InvariantCulture.CompareInfo

      ' Searches for the ligature Æ.
      Dim myStr As [String] = "Is AE or ae the same as Æ or æ?"
      Console.WriteLine()
      Console.WriteLine("No options    : {0}", myStr)
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE"), myComp.LastIndexOf(myStr, "AE"))
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae"), myComp.LastIndexOf(myStr, "ae"))
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c), myComp.LastIndexOf(myStr, "Æ"c))
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c), myComp.LastIndexOf(myStr, "æ"c))
      Console.WriteLine("Ordinal       : {0}", myStr)
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "AE", CompareOptions.Ordinal))
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "ae", CompareOptions.Ordinal))
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "Æ"c, CompareOptions.Ordinal))
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "æ"c, CompareOptions.Ordinal))
      Console.WriteLine("IgnoreCase    : {0}", myStr)
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "AE", CompareOptions.IgnoreCase))
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "ae", CompareOptions.IgnoreCase))
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "Æ"c, CompareOptions.IgnoreCase))
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "æ"c, CompareOptions.IgnoreCase))

      ' Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
      myStr = "Is " & ChrW(&H0055) & ChrW(&H0308) & " or " & ChrW(&H0075) & ChrW(&H0308) & " the same as " & ChrW(&H00DC) & " or " & ChrW(&H00FC) & "?"
      Console.WriteLine()
      Console.WriteLine("No options    : {0}", myStr)
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308)), myComp.LastIndexOf(myStr, "U" & ChrW(&H0308)))
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308)), myComp.LastIndexOf(myStr, "u" & ChrW(&H0308)))
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c), myComp.LastIndexOf(myStr, "Ü"c))
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c), myComp.LastIndexOf(myStr, "ü"c))
      Console.WriteLine("Ordinal       : {0}", myStr)
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), CompareOptions.Ordinal))
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), CompareOptions.Ordinal))
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "Ü"c, CompareOptions.Ordinal))
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "ü"c, CompareOptions.Ordinal))
      Console.WriteLine("IgnoreCase    : {0}", myStr)
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), CompareOptions.IgnoreCase))
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), CompareOptions.IgnoreCase))
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "Ü"c, CompareOptions.IgnoreCase))
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "ü"c, CompareOptions.IgnoreCase))

   End Sub 'Main

   Public Shared Sub PrintMarker(Prefix As [String], First As Integer, Last As Integer)

      ' Determines the size of the array to create.
      Dim mySize As Integer
      If Last > First Then
         mySize = Last
      Else
         mySize = First
      End If 

      If mySize > - 1 Then

         ' Creates an array of Char to hold the markers.
         Dim myCharArr(mySize + 1) As [Char]

         ' Inserts the appropriate markers.
         If First > - 1 Then
            myCharArr(First) = "f"c
         End If
         If Last > - 1 Then
            myCharArr(Last) = "l"c
         End If
         If First = Last Then
            myCharArr(First) = "b"c
         End If 
         ' Displays the array of Char as a String.
         Console.WriteLine("{0}{1}", Prefix, New [String](myCharArr))

      Else
         Console.WriteLine(Prefix)

      End If 

   End Sub 'PrintMarker

End Class 'SamplesCompareInfo 


'This code produces the following output.
'
'No options    : Is AE or ae the same as Æ or æ?
'           AE :    f                    l
'           ae :          f                   l
'            Æ :    f                    l
'            æ :          f                   l
'Ordinal       : Is AE or ae the same as Æ or æ?
'           AE :    b
'           ae :          b
'            Æ :                         b
'            æ :                              b
'IgnoreCase    : Is AE or ae the same as Æ or æ?
'           AE :    f                         l
'           ae :    f                         l
'            Æ :    f                         l
'            æ :    f                         l
'
'No options    : Is U" or u" the same as Ü or ü?
'           U" :    f                    l
'           u" :          f                   l
'            Ü :    f                    l
'            ü :          f                   l
'Ordinal       : Is U" or u" the same as Ü or ü?
'           U" :    b
'           u" :          b
'            Ü :                         b
'            ü :                              b
'IgnoreCase    : Is U" or u" the same as Ü or ü?
'           U" :    f                         l
'           u" :    f                         l
'            Ü :    f                         l
'            ü :    f                         l

Commenti

La stringa di origine viene cercata all'indietro a partire dalla fine della stringa e termina all'inizio della stringa.The source string is searched backward starting at the end of the string and ending at the beginning of the string.

Il CompareOptions.StringSort valore non è valido per questo metodo.The CompareOptions.StringSort value is not valid for this method.

Se options non include il Ordinal valore, questo overload esegue una ricerca con distinzione delle impostazioni cultura.If options does not include the Ordinal value, this overload performs a culture-sensitive search. Se il carattere è un valore Unicode che rappresenta un carattere precomposto, ad esempio la legatura "Æ" (U + 00C6), può essere considerato equivalente a qualsiasi occorrenza dei componenti nella sequenza corretta, ad esempio "AE" (U + 0041, U + 0045), a seconda delle impostazioni cultura.If the character is a Unicode value representing a precomposed character, such as the ligature "Æ" (U+00C6), it might be considered equivalent to any occurrence of its components in the correct sequence, such as "AE" (U+0041, U+0045), depending on the culture. Se options include il Ordinal valore, questo overload esegue una ricerca ordinale (indipendente dalle impostazioni cultura).If options includes the Ordinal value, this overload performs an ordinal (culture-insensitive) search. Un carattere viene considerato equivalente a un altro carattere solo se i valori Unicode sono uguali.A character is considered equivalent to another character only if the Unicode values are the same. Gli overload di String.LastIndexOf che cercano un carattere eseguono una ricerca ordinale, mentre quelli che cercano una stringa eseguono una ricerca con distinzione delle impostazioni cultura.Overloads of String.LastIndexOf that search for a character perform an ordinal search, whereas those that search for a string perform a culture-sensitive search.

Nota

Quando possibile, è necessario chiamare i metodi di confronto tra stringhe con un parametro CompareOptions di tipo per specificare il tipo di confronto previsto.When possible, you should call string comparison methods that have a parameter of type CompareOptions to specify the kind of comparison expected. Come regola generale, usare le opzioni linguistiche (usando le impostazioni cultura correnti) per confrontare le stringhe visualizzate nell'interfaccia utente CompareOptions.Ordinal e CompareOptions.OrdinalIgnoreCase specificare o per i confronti di sicurezza.As a general rule, use linguistic options (using the current culture) for comparing strings displayed in the user interface and specify CompareOptions.Ordinal or CompareOptions.OrdinalIgnoreCase for security comparisons.

Note per i chiamanti

I set di caratteri includono caratteri ignorabili, ovvero caratteri che non vengono considerati quando si esegue un ordinamento linguistico o con distinzione delle impostazioni cultura.Character sets include ignorable characters, which are characters that are not considered when performing a linguistic or culture-sensitive sort. In una ricerca dipendente dalle impostazioni cultura, value se è un carattere ignorabile, il risultato è equivalente alla ricerca con il carattere rimosso.In a culture-sensitive search, if value is an ignorable character, the result is equivalent to searching with that character removed. In questo caso, il LastIndexOf(String, Char, CompareOptions) metodo restituisce sempre l'ultima posizione del carattere source in per indicare che la corrispondenza viene trovata alla fine di source.In this case, the LastIndexOf(String, Char, CompareOptions) method always returns the last character position in source to indicate that the match is found at the end of source. Nell'esempio seguente il LastIndexOf(String, Char, CompareOptions) metodo viene usato per cercare un trattino (U + 00AD) flessibile in due stringhe.In the following example, the LastIndexOf(String, Char, CompareOptions) method is used to search for a soft hyphen (U+00AD) in two strings. Solo una delle stringhe contiene un segno meno facoltativo.Only one of the strings contains a soft hyphen. In entrambi i casi, poiché il trattino Soft è un carattere ignorabile, una ricerca con distinzione delle impostazioni cultura restituisce l'ultima posizione di indice nella stringa di origine.In both cases, because the soft hyphen is an ignorable character, a culture-sensitive search returns the last index position in the source string. Al contrario, una ricerca ordinale trova correttamente il trattino morbido in una stringa e segnala che è assente dalla seconda stringa.In contrast, an ordinal search successfully finds the soft hyphen in one string and reports that it is absent from the second string.

[!code-csharpSystem.Globalization.CompareInfo.LastIndexOf#4] [!code-vbSystem.Globalization.CompareInfo.LastIndexOf#4][!code-csharpSystem.Globalization.CompareInfo.LastIndexOf#4] [!code-vbSystem.Globalization.CompareInfo.LastIndexOf#4]

Vedi anche

LastIndexOf(String, String, CompareOptions) LastIndexOf(String, String, CompareOptions) LastIndexOf(String, String, CompareOptions) LastIndexOf(String, String, CompareOptions)

Cerca la sottostringa specificata e restituisce l'indice in base zero dell'ultima occorrenza all'interno dell'intera stringa di origine usando il valore CompareOptions specificato.Searches for the specified substring and returns the zero-based index of the last occurrence within the entire source string using the specified CompareOptions value.

public:
 virtual int LastIndexOf(System::String ^ source, System::String ^ value, System::Globalization::CompareOptions options);
public virtual int LastIndexOf (string source, string value, System.Globalization.CompareOptions options);
abstract member LastIndexOf : string * string * System.Globalization.CompareOptions -> int
override this.LastIndexOf : string * string * System.Globalization.CompareOptions -> int
Public Overridable Function LastIndexOf (source As String, value As String, options As CompareOptions) As Integer

Parametri

source
String String String String

Stringa in cui effettuare la ricerca.The string to search.

value
String String String String

Stringa da individuare all'interno di source.The string to locate within source.

options
CompareOptions CompareOptions CompareOptions CompareOptions

Valore che definisce la modalità di confronto di source e value.A value that defines how source and value should be compared. options è il valore di enumerazione Ordinal o la combinazione bit per bit di uno o più dei seguenti valori: IgnoreCase, IgnoreSymbols, IgnoreNonSpace, IgnoreWidth e IgnoreKanaType.options is either the enumeration value Ordinal, or a bitwise combination of one or more of the following values: IgnoreCase, IgnoreSymbols, IgnoreNonSpace, IgnoreWidth, and IgnoreKanaType.

Restituisce

Indice in base zero dell'ultima occorrenza di value se presente, all'interno di source usando le opzioni di confronto specificate; in caso contrario, -1.The zero-based index of the last occurrence of value, if found, within source, using the specified comparison options; otherwise, -1.

Eccezioni

source è null.source is null.

In alternativa-or-

value è null.value is null.

options contiene un valore di CompareOptions non valido.options contains an invalid CompareOptions value.

Esempi

Nell'esempio seguente vengono determinati gli indici della prima e dell'ultima occorrenza di un carattere o di una sottostringa all'interno di una stringa.The following example determines the indexes of the first and last occurrences of a character or a substring within a string.

using namespace System;
using namespace System::Globalization;
void PrintMarker( String^ Prefix, int First, int Last )
{
   
   // Determines the size of the array to create.
   int mySize;
   if ( Last > First )
      mySize = Last;
   else
      mySize = First;

   if ( mySize > -1 )
   {
      
      // Creates an array of Char to hold the markers.
      array<Char>^myCharArr = gcnew array<Char>(mySize + 1);
      
      // Inserts the appropriate markers.
      if ( First > -1 )
            myCharArr[ First ] = 'f';
      if ( Last > -1 )
            myCharArr[ Last ] = 'l';
      if ( First == Last )
            myCharArr[ First ] = 'b';
      
      // Displays the array of Char as a String.
      Console::WriteLine( "{0}{1}", Prefix, gcnew String( myCharArr ) );
   }
   else
      Console::WriteLine( Prefix );
}

int main()
{
   
   // Creates CompareInfo for the InvariantCulture.
   CompareInfo^ myComp = CultureInfo::InvariantCulture->CompareInfo;
   
   // Searches for the ligature Æ.
   String^ myStr = "Is AE or ae the same as Æ or æ?";
   Console::WriteLine();
   Console::WriteLine( "No options    : {0}", myStr );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE" ), myComp->LastIndexOf( myStr, "AE" ) );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae" ), myComp->LastIndexOf( myStr, "ae" ) );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ' ), myComp->LastIndexOf( myStr, L'Æ' ) );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ' ), myComp->LastIndexOf( myStr, L'æ' ) );
   Console::WriteLine( "Ordinal       : {0}", myStr );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "AE", CompareOptions::Ordinal ) );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "ae", CompareOptions::Ordinal ) );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'Æ', CompareOptions::Ordinal ) );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'æ', CompareOptions::Ordinal ) );
   Console::WriteLine( "IgnoreCase    : {0}", myStr );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "AE", CompareOptions::IgnoreCase ) );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "ae", CompareOptions::IgnoreCase ) );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'Æ', CompareOptions::IgnoreCase ) );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'æ', CompareOptions::IgnoreCase ) );
   
   // Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
   myStr = "Is U\u0308 or u\u0308 the same as \u00DC or \u00FC?";
   Console::WriteLine();
   Console::WriteLine( "No options    : {0}", myStr );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308" ), myComp->LastIndexOf( myStr, "U\u0308" ) );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308" ), myComp->LastIndexOf( myStr, "u\u0308" ) );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü' ), myComp->LastIndexOf( myStr, L'Ü' ) );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü' ), myComp->LastIndexOf( myStr, L'ü' ) );
   Console::WriteLine( "Ordinal       : {0}", myStr );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "U\u0308", CompareOptions::Ordinal ) );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "u\u0308", CompareOptions::Ordinal ) );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'Ü', CompareOptions::Ordinal ) );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'ü', CompareOptions::Ordinal ) );
   Console::WriteLine( "IgnoreCase    : {0}", myStr );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "U\u0308", CompareOptions::IgnoreCase ) );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "u\u0308", CompareOptions::IgnoreCase ) );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'Ü', CompareOptions::IgnoreCase ) );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'ü', CompareOptions::IgnoreCase ) );
}

/*
This code produces the following output.

No options    : Is AE or ae the same as Æ or æ?
           AE :    f                    l
           ae :          f                   l
            Æ :    f                    l
            æ :          f                   l
Ordinal       : Is AE or ae the same as Æ or æ?
           AE :    b
           ae :          b
            Æ :                         b
            æ :                              b
IgnoreCase    : Is AE or ae the same as Æ or æ?
           AE :    f                         l
           ae :    f                         l
            Æ :    f                         l
            æ :    f                         l

No options    : Is U" or u" the same as Ü or ü?
           U" :    f                    l
           u" :          f                   l
            Ü :    f                    l
            ü :          f                   l
Ordinal       : Is U" or u" the same as Ü or ü?
           U" :    b
           u" :          b
            Ü :                         b
            ü :                              b
IgnoreCase    : Is U" or u" the same as Ü or ü?
           U" :    f                         l
           u" :    f                         l
            Ü :    f                         l
            ü :    f                         l

*/
using System;
using System.Globalization;

public class SamplesCompareInfo  {

   public static void Main()  {

      // Creates CompareInfo for the InvariantCulture.
      CompareInfo myComp = CultureInfo.InvariantCulture.CompareInfo;

      // Searches for the ligature Æ.
      String myStr = "Is AE or ae the same as Æ or æ?";
      Console.WriteLine();
      Console.WriteLine( "No options    : {0}", myStr );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE" ), myComp.LastIndexOf( myStr, "AE" ) );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae" ), myComp.LastIndexOf( myStr, "ae" ) );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ' ), myComp.LastIndexOf( myStr, 'Æ' ) );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ' ), myComp.LastIndexOf( myStr, 'æ' ) );
      Console.WriteLine( "Ordinal       : {0}", myStr );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "AE", CompareOptions.Ordinal ) );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "ae", CompareOptions.Ordinal ) );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'Æ', CompareOptions.Ordinal ) );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'æ', CompareOptions.Ordinal ) );
      Console.WriteLine( "IgnoreCase    : {0}", myStr );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "AE", CompareOptions.IgnoreCase ) );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "ae", CompareOptions.IgnoreCase ) );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'Æ', CompareOptions.IgnoreCase ) );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'æ', CompareOptions.IgnoreCase ) );

      // Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
      myStr = "Is \u0055\u0308 or \u0075\u0308 the same as \u00DC or \u00FC?";
      Console.WriteLine();
      Console.WriteLine( "No options    : {0}", myStr );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308" ), myComp.LastIndexOf( myStr, "U\u0308" ) );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308" ), myComp.LastIndexOf( myStr, "u\u0308" ) );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü' ), myComp.LastIndexOf( myStr, 'Ü' ) );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü' ), myComp.LastIndexOf( myStr, 'ü' ) );
      Console.WriteLine( "Ordinal       : {0}", myStr );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "U\u0308", CompareOptions.Ordinal ) );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "u\u0308", CompareOptions.Ordinal ) );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'Ü', CompareOptions.Ordinal ) );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'ü', CompareOptions.Ordinal ) );
      Console.WriteLine( "IgnoreCase    : {0}", myStr );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "U\u0308", CompareOptions.IgnoreCase ) );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "u\u0308", CompareOptions.IgnoreCase ) );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'Ü', CompareOptions.IgnoreCase ) );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'ü', CompareOptions.IgnoreCase ) );

   }

   public static void PrintMarker( String Prefix, int First, int Last )  {

      // Determines the size of the array to create.
      int mySize;
      if ( Last > First )
         mySize = Last;
      else
         mySize = First;

      if ( mySize > -1 )  {

         // Creates an array of Char to hold the markers.
         Char[] myCharArr = new Char[mySize+1];

         // Inserts the appropriate markers.
         if ( First > -1 )
         myCharArr[First] = 'f';
         if ( Last > -1 )
            myCharArr[Last] = 'l';
         if ( First == Last )
         myCharArr[First] = 'b';

         // Displays the array of Char as a String.
         Console.WriteLine( "{0}{1}", Prefix, new String( myCharArr ) );

      }
      else
         Console.WriteLine( Prefix );

   }

}


/*
This code produces the following output.

No options    : Is AE or ae the same as Æ or æ?
           AE :    f                    l
           ae :          f                   l
            Æ :    f                    l
            æ :          f                   l
Ordinal       : Is AE or ae the same as Æ or æ?
           AE :    b
           ae :          b
            Æ :                         b
            æ :                              b
IgnoreCase    : Is AE or ae the same as Æ or æ?
           AE :    f                         l
           ae :    f                         l
            Æ :    f                         l
            æ :    f                         l

No options    : Is U" or u" the same as Ü or ü?
           U" :    f                    l
           u" :          f                   l
            Ü :    f                    l
            ü :          f                   l
Ordinal       : Is U" or u" the same as Ü or ü?
           U" :    b
           u" :          b
            Ü :                         b
            ü :                              b
IgnoreCase    : Is U" or u" the same as Ü or ü?
           U" :    f                         l
           u" :    f                         l
            Ü :    f                         l
            ü :    f                         l

*/
Imports System
Imports System.Globalization
Imports Microsoft.VisualBasic

Public Class SamplesCompareInfo

   Public Shared Sub Main()

      ' Creates CompareInfo for the InvariantCulture.
      Dim myComp As CompareInfo = CultureInfo.InvariantCulture.CompareInfo

      ' Searches for the ligature Æ.
      Dim myStr As [String] = "Is AE or ae the same as Æ or æ?"
      Console.WriteLine()
      Console.WriteLine("No options    : {0}", myStr)
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE"), myComp.LastIndexOf(myStr, "AE"))
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae"), myComp.LastIndexOf(myStr, "ae"))
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c), myComp.LastIndexOf(myStr, "Æ"c))
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c), myComp.LastIndexOf(myStr, "æ"c))
      Console.WriteLine("Ordinal       : {0}", myStr)
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "AE", CompareOptions.Ordinal))
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "ae", CompareOptions.Ordinal))
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "Æ"c, CompareOptions.Ordinal))
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "æ"c, CompareOptions.Ordinal))
      Console.WriteLine("IgnoreCase    : {0}", myStr)
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "AE", CompareOptions.IgnoreCase))
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "ae", CompareOptions.IgnoreCase))
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "Æ"c, CompareOptions.IgnoreCase))
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "æ"c, CompareOptions.IgnoreCase))

      ' Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
      myStr = "Is " & ChrW(&H0055) & ChrW(&H0308) & " or " & ChrW(&H0075) & ChrW(&H0308) & " the same as " & ChrW(&H00DC) & " or " & ChrW(&H00FC) & "?"
      Console.WriteLine()
      Console.WriteLine("No options    : {0}", myStr)
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308)), myComp.LastIndexOf(myStr, "U" & ChrW(&H0308)))
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308)), myComp.LastIndexOf(myStr, "u" & ChrW(&H0308)))
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c), myComp.LastIndexOf(myStr, "Ü"c))
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c), myComp.LastIndexOf(myStr, "ü"c))
      Console.WriteLine("Ordinal       : {0}", myStr)
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), CompareOptions.Ordinal))
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), CompareOptions.Ordinal))
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "Ü"c, CompareOptions.Ordinal))
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "ü"c, CompareOptions.Ordinal))
      Console.WriteLine("IgnoreCase    : {0}", myStr)
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), CompareOptions.IgnoreCase))
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), CompareOptions.IgnoreCase))
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "Ü"c, CompareOptions.IgnoreCase))
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "ü"c, CompareOptions.IgnoreCase))

   End Sub 'Main

   Public Shared Sub PrintMarker(Prefix As [String], First As Integer, Last As Integer)

      ' Determines the size of the array to create.
      Dim mySize As Integer
      If Last > First Then
         mySize = Last
      Else
         mySize = First
      End If 

      If mySize > - 1 Then

         ' Creates an array of Char to hold the markers.
         Dim myCharArr(mySize + 1) As [Char]

         ' Inserts the appropriate markers.
         If First > - 1 Then
            myCharArr(First) = "f"c
         End If
         If Last > - 1 Then
            myCharArr(Last) = "l"c
         End If
         If First = Last Then
            myCharArr(First) = "b"c
         End If 
         ' Displays the array of Char as a String.
         Console.WriteLine("{0}{1}", Prefix, New [String](myCharArr))

      Else
         Console.WriteLine(Prefix)

      End If 

   End Sub 'PrintMarker

End Class 'SamplesCompareInfo 


'This code produces the following output.
'
'No options    : Is AE or ae the same as Æ or æ?
'           AE :    f                    l
'           ae :          f                   l
'            Æ :    f                    l
'            æ :          f                   l
'Ordinal       : Is AE or ae the same as Æ or æ?
'           AE :    b
'           ae :          b
'            Æ :                         b
'            æ :                              b
'IgnoreCase    : Is AE or ae the same as Æ or æ?
'           AE :    f                         l
'           ae :    f                         l
'            Æ :    f                         l
'            æ :    f                         l
'
'No options    : Is U" or u" the same as Ü or ü?
'           U" :    f                    l
'           u" :          f                   l
'            Ü :    f                    l
'            ü :          f                   l
'Ordinal       : Is U" or u" the same as Ü or ü?
'           U" :    b
'           u" :          b
'            Ü :                         b
'            ü :                              b
'IgnoreCase    : Is U" or u" the same as Ü or ü?
'           U" :    f                         l
'           u" :    f                         l
'            Ü :    f                         l
'            ü :    f                         l

Commenti

La stringa di origine viene cercata all'indietro a partire dalla fine della stringa e termina all'inizio della stringa.The source string is searched backward starting at the end of the string and ending at the beginning of the string.

Il CompareOptions.StringSort valore non è valido per questo metodo.The CompareOptions.StringSort value is not valid for this method.

Se options non include il Ordinal valore, questo overload esegue una ricerca con distinzione delle impostazioni cultura.If options does not include the Ordinal value, this overload performs a culture-sensitive search. Un valore Unicode che rappresenta un carattere precomposto, ad esempio la legatura "Æ" (U + 00C6), può essere considerato equivalente a qualsiasi occorrenza dei componenti del carattere nella sequenza corretta, ad esempio "AE" (U + 0041, U + 0045), a seconda delle impostazioni cultura.A Unicode value representing a precomposed character, such as the ligature "Æ" (U+00C6), might be considered equivalent to any occurrence of the character's components in the correct sequence, such as "AE" (U+0041, U+0045), depending on the culture. Se options include il Ordinal valore, questo overload esegue una ricerca ordinale (indipendente dalle impostazioni cultura), in cui vengono confrontati i valori Unicode.If options includes the Ordinal value, this overload performs an ordinal (culture-insensitive) search, where the Unicode values are compared.

Nota

Quando possibile, è necessario chiamare i metodi di confronto tra stringhe con un parametro CompareOptions di tipo per specificare il tipo di confronto previsto.When possible, you should call string comparison methods that have a parameter of type CompareOptions to specify the kind of comparison expected. Come regola generale, usare le opzioni linguistiche (usando le impostazioni cultura correnti) per confrontare le stringhe visualizzate nell'interfaccia utente CompareOptions.Ordinal e CompareOptions.OrdinalIgnoreCase specificare o per i confronti di sicurezza.As a general rule, use linguistic options (using the current culture) for comparing strings displayed in the user interface and specify CompareOptions.Ordinal or CompareOptions.OrdinalIgnoreCase for security comparisons.

Note per i chiamanti

I set di caratteri includono caratteri ignorabili, ovvero caratteri che non vengono considerati quando si esegue un ordinamento linguistico o con distinzione delle impostazioni cultura.Character sets include ignorable characters, which are characters that are not considered when performing a linguistic or culture-sensitive sort. In una ricerca dipendente dalle impostazioni cultura (ovvero se options non è Ordinal o OrdinalIgnoreCase), se value contiene un carattere ignorable, il risultato è equivalente alla ricerca con il carattere rimosso.In a culture-sensitive search (that is, if options is not Ordinal or OrdinalIgnoreCase), if value contains an ignorable character, the result is equivalent to searching with that character removed. Se value è costituito solo da uno o più caratteri ignorabili LastIndexOf(String, String, CompareOptions) , il metodo sourcerestituisce sempre.LengthIf value consists only of one or more ignorable characters, the LastIndexOf(String, String, CompareOptions) method always returns source.Length -1, che rappresenta l'ultima posizione di indice sourcein.- 1, which represents the last index position in source. Nell'esempio seguente il LastIndexOf(String, String, CompareOptions) metodo viene usato per trovare tre sottostringhe (un segno meno (U + 00AD), un trattino morbido seguito da "n" e un trattino morbido seguito da "m") in due stringhe.In the following example, the LastIndexOf(String, String, CompareOptions) method is used to find three substrings (a soft hyphen (U+00AD), a soft hyphen followed by "n", and a soft hyphen followed by "m") in two strings. Solo una delle stringhe contiene un segno meno facoltativo.Only one of the strings contains a soft hyphen. Poiché il trattino Soft è un carattere ignorabile, una ricerca con distinzione delle impostazioni cultura restituisce lo stesso valore restituito se il trattino non è incluso nella stringa di ricerca.Because the soft hyphen is an ignorable character, a culture-sensitive search returns the same value that it would return if the soft hyphen were not included in the search string. Una ricerca ordinale, tuttavia, trova correttamente il trattino morbido in una stringa e segnala che è assente dalla seconda stringa.An ordinal search, however, successfully finds the soft hyphen in one string and reports that it is absent from the second string.

[!code-csharpSystem.Globalization.CompareInfo.LastIndexOf#6] [!code-vbSystem.Globalization.CompareInfo.LastIndexOf#6][!code-csharpSystem.Globalization.CompareInfo.LastIndexOf#6] [!code-vbSystem.Globalization.CompareInfo.LastIndexOf#6]

Vedi anche

LastIndexOf(String, Char, Int32) LastIndexOf(String, Char, Int32) LastIndexOf(String, Char, Int32) LastIndexOf(String, Char, Int32)

Cerca il carattere specificato e restituisce l'indice in base zero dell'ultima occorrenza all'interno della sezione della stringa di origine compresa tra l'inizio della stringa e l'indice specificato.Searches for the specified character and returns the zero-based index of the last occurrence within the section of the source string that extends from the beginning of the string to the specified index.

public:
 virtual int LastIndexOf(System::String ^ source, char value, int startIndex);
public virtual int LastIndexOf (string source, char value, int startIndex);
abstract member LastIndexOf : string * char * int -> int
override this.LastIndexOf : string * char * int -> int
Public Overridable Function LastIndexOf (source As String, value As Char, startIndex As Integer) As Integer

Parametri

source
String String String String

Stringa in cui effettuare la ricerca.The string to search.

value
Char Char Char Char

Carattere da individuare all'interno di source.The character to locate within source.

startIndex
Int32 Int32 Int32 Int32

Indice iniziale in base zero della ricerca all'indietro.The zero-based starting index of the backward search.

Restituisce

Indice in base zero dell'ultima occorrenza di value, se presente, all'interno della sezione di source compresa tra l'inizio di source e startIndex; in caso contrario, -1.The zero-based index of the last occurrence of value, if found, within the section of source that extends from the beginning of source to startIndex; otherwise, -1. Restituisce startIndex se value è un carattere che è possibile ignorare.Returns startIndex if value is an ignorable character.

Eccezioni

startIndex non è compreso nell'intervallo di indici validi per source.startIndex is outside the range of valid indexes for source.

Esempi

Nell'esempio seguente vengono determinati gli indici della prima e dell'ultima occorrenza di un carattere o di una sottostringa all'interno di una parte di una stringa.The following example determines the indexes of the first and last occurrences of a character or a substring within a portion of a string. Si noti IndexOf che LastIndexOf e eseguono la ricerca in parti diverse della stringa, anche con lo startIndex stesso parametro.Note that IndexOf and LastIndexOf are searching in different portions of the string, even with the same startIndex parameter.

using namespace System;
using namespace System::Globalization;
void PrintMarker( String^ Prefix, int First, int Last )
{
   
   // Determines the size of the array to create.
   int mySize;
   if ( Last > First )
      mySize = Last;
   else
      mySize = First;

   if ( mySize > -1 )
   {
      
      // Creates an array of Char to hold the markers.
      array<Char>^myCharArr = gcnew array<Char>(mySize + 1);
      
      // Inserts the appropriate markers.
      if ( First > -1 )
            myCharArr[ First ] = 'f';
      if ( Last > -1 )
            myCharArr[ Last ] = 'l';
      if ( First == Last )
            myCharArr[ First ] = 'b';
      
      // Displays the array of Char as a String.
      Console::WriteLine( "{0}{1}", Prefix, gcnew String( myCharArr ) );
   }
   else
      Console::WriteLine( Prefix );
}

int main()
{
   
   // Creates CompareInfo for the InvariantCulture.
   CompareInfo^ myComp = CultureInfo::InvariantCulture->CompareInfo;
   
   // iS is the starting index of the substring.
   int iS = 20;
   
   // myT1 is the string used for padding.
   String^ myT1;
   
   // Searches for the ligature Æ.
   String^ myStr = "Is AE or ae the same as Æ or æ?";
   Console::WriteLine();
   myT1 = gcnew String( '-',iS );
   Console::WriteLine( "IndexOf( String, *, {0}, * )", iS );
   Console::WriteLine( "Original      : {0}", myStr );
   Console::WriteLine( "No options    : {0}{1}", myT1, myStr->Substring( iS ) );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", iS ), -1 );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", iS ), -1 );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', iS ), -1 );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', iS ), -1 );
   Console::WriteLine( "Ordinal       : {0}{1}", myT1, myStr->Substring( iS ) );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", iS, CompareOptions::Ordinal ), -1 );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", iS, CompareOptions::Ordinal ), -1 );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', iS, CompareOptions::Ordinal ), -1 );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', iS, CompareOptions::Ordinal ), -1 );
   Console::WriteLine( "IgnoreCase    : {0}{1}", myT1, myStr->Substring( iS ) );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", iS, CompareOptions::IgnoreCase ), -1 );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", iS, CompareOptions::IgnoreCase ), -1 );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', iS, CompareOptions::IgnoreCase ), -1 );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', iS, CompareOptions::IgnoreCase ), -1 );
   myT1 = gcnew String( '-',myStr->Length - iS - 1 );
   Console::WriteLine( "LastIndexOf( String, *, {0}, * )", iS );
   Console::WriteLine( "Original      : {0}", myStr );
   Console::WriteLine( "No options    : {0}{1}", myStr->Substring( 0, iS + 1 ), myT1 );
   PrintMarker( "           AE : ", -1, myComp->LastIndexOf( myStr, "AE", iS ) );
   PrintMarker( "           ae : ", -1, myComp->LastIndexOf( myStr, "ae", iS ) );
   PrintMarker( "            Æ : ", -1, myComp->LastIndexOf( myStr, L'Æ', iS ) );
   PrintMarker( "            æ : ", -1, myComp->LastIndexOf( myStr, L'æ', iS ) );
   Console::WriteLine( "Ordinal       : {0}{1}", myStr->Substring( 0, iS + 1 ), myT1 );
   PrintMarker( "           AE : ", -1, myComp->LastIndexOf( myStr, "AE", iS, CompareOptions::Ordinal ) );
   PrintMarker( "           ae : ", -1, myComp->LastIndexOf( myStr, "ae", iS, CompareOptions::Ordinal ) );
   PrintMarker( "            Æ : ", -1, myComp->LastIndexOf( myStr, L'Æ', iS, CompareOptions::Ordinal ) );
   PrintMarker( "            æ : ", -1, myComp->LastIndexOf( myStr, L'æ', iS, CompareOptions::Ordinal ) );
   Console::WriteLine( "IgnoreCase    : {0}{1}", myStr->Substring( 0, iS + 1 ), myT1 );
   PrintMarker( "           AE : ", -1, myComp->LastIndexOf( myStr, "AE", iS, CompareOptions::IgnoreCase ) );
   PrintMarker( "           ae : ", -1, myComp->LastIndexOf( myStr, "ae", iS, CompareOptions::IgnoreCase ) );
   PrintMarker( "            Æ : ", -1, myComp->LastIndexOf( myStr, L'Æ', iS, CompareOptions::IgnoreCase ) );
   PrintMarker( "            æ : ", -1, myComp->LastIndexOf( myStr, L'æ', iS, CompareOptions::IgnoreCase ) );
   
   // Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
   myStr = "Is U\u0308 or u\u0308 the same as \u00DC or \u00FC?";
   Console::WriteLine();
   myT1 = gcnew String( '-',iS );
   Console::WriteLine( "IndexOf( String, *, {0}, * )", iS );
   Console::WriteLine( "Original      : {0}", myStr );
   Console::WriteLine( "No options    : {0}{1}", myT1, myStr->Substring( iS ) );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", iS ), -1 );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", iS ), -1 );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', iS ), -1 );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', iS ), -1 );
   Console::WriteLine( "Ordinal       : {0}{1}", myT1, myStr->Substring( iS ) );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", iS, CompareOptions::Ordinal ), -1 );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", iS, CompareOptions::Ordinal ), -1 );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', iS, CompareOptions::Ordinal ), -1 );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', iS, CompareOptions::Ordinal ), -1 );
   Console::WriteLine( "IgnoreCase    : {0}{1}", myT1, myStr->Substring( iS ) );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", iS, CompareOptions::IgnoreCase ), -1 );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", iS, CompareOptions::IgnoreCase ), -1 );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', iS, CompareOptions::IgnoreCase ), -1 );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', iS, CompareOptions::IgnoreCase ), -1 );
   myT1 = gcnew String( '-',myStr->Length - iS - 1 );
   Console::WriteLine( "LastIndexOf( String, *, {0}, * )", iS );
   Console::WriteLine( "Original      : {0}", myStr );
   Console::WriteLine( "No options    : {0}{1}", myStr->Substring( 0, iS + 1 ), myT1 );
   PrintMarker( "           U\u0308 : ", -1, myComp->LastIndexOf( myStr, "U\u0308", iS ) );
   PrintMarker( "           u\u0308 : ", -1, myComp->LastIndexOf( myStr, "u\u0308", iS ) );
   PrintMarker( "            Ü : ", -1, myComp->LastIndexOf( myStr, L'Ü', iS ) );
   PrintMarker( "            ü : ", -1, myComp->LastIndexOf( myStr, L'ü', iS ) );
   Console::WriteLine( "Ordinal       : {0}{1}", myStr->Substring( 0, iS + 1 ), myT1 );
   PrintMarker( "           U\u0308 : ", -1, myComp->LastIndexOf( myStr, "U\u0308", iS, CompareOptions::Ordinal ) );
   PrintMarker( "           u\u0308 : ", -1, myComp->LastIndexOf( myStr, "u\u0308", iS, CompareOptions::Ordinal ) );
   PrintMarker( "            Ü : ", -1, myComp->LastIndexOf( myStr, L'Ü', iS, CompareOptions::Ordinal ) );
   PrintMarker( "            ü : ", -1, myComp->LastIndexOf( myStr, L'ü', iS, CompareOptions::Ordinal ) );
   Console::WriteLine( "IgnoreCase    : {0}{1}", myStr->Substring( 0, iS + 1 ), myT1 );
   PrintMarker( "           U\u0308 : ", -1, myComp->LastIndexOf( myStr, "U\u0308", iS, CompareOptions::IgnoreCase ) );
   PrintMarker( "           u\u0308 : ", -1, myComp->LastIndexOf( myStr, "u\u0308", iS, CompareOptions::IgnoreCase ) );
   PrintMarker( "            Ü : ", -1, myComp->LastIndexOf( myStr, L'Ü', iS, CompareOptions::IgnoreCase ) );
   PrintMarker( "            ü : ", -1, myComp->LastIndexOf( myStr, L'ü', iS, CompareOptions::IgnoreCase ) );
}

/*
This code produces the following output.

IndexOf( String, *, 20, * )
Original      : Is AE or ae the same as Æ or æ?
No options    : -------------------- as Æ or æ?
           AE :                         f
           ae :                              f
            Æ :                         f
            æ :                              f
Ordinal       : -------------------- as Æ or æ?
           AE :
           ae :
            Æ :                         f
            æ :                              f
IgnoreCase    : -------------------- as Æ or æ?
           AE :                         f
           ae :                         f
            Æ :                         f
            æ :                         f
LastIndexOf( String, *, 20, * )
Original      : Is AE or ae the same as Æ or æ?
No options    : Is AE or ae the same ----------
           AE :    l
           ae :          l
            Æ :    l
            æ :          l
Ordinal       : Is AE or ae the same ----------
           AE :    l
           ae :          l
            Æ :
            æ :
IgnoreCase    : Is AE or ae the same ----------
           AE :          l
           ae :          l
            Æ :          l
            æ :          l

IndexOf( String, *, 20, * )
Original      : Is U" or u" the same as Ü or ü?
No options    : -------------------- as Ü or ü?
           U" :                         f
           u" :                              f
            Ü :                         f
            ü :                              f
Ordinal       : -------------------- as Ü or ü?
           U" :
           u" :
            Ü :                         f
            ü :                              f
IgnoreCase    : -------------------- as Ü or ü?
           U" :                         f
           u" :                         f
            Ü :                         f
            ü :                         f
LastIndexOf( String, *, 20, * )
Original      : Is U" or u" the same as Ü or ü?
No options    : Is U" or u" the same ----------
           U" :    l
           u" :          l
            Ü :    l
            ü :          l
Ordinal       : Is U" or u" the same ----------
           U" :    l
           u" :          l
            Ü :
            ü :
IgnoreCase    : Is U" or u" the same ----------
           U" :          l
           u" :          l
            Ü :          l
            ü :          l

*/
using System;
using System.Globalization;

public class SamplesCompareInfo  {

   public static void Main()  {

      // Creates CompareInfo for the InvariantCulture.
      CompareInfo myComp = CultureInfo.InvariantCulture.CompareInfo;

      // iS is the starting index of the substring.
      int iS = 20;
      // myT1 is the string used for padding.
      String myT1;

      // Searches for the ligature Æ.
      String myStr = "Is AE or ae the same as Æ or æ?";
      Console.WriteLine();

      myT1 = new String( '-', iS );
      Console.WriteLine( "IndexOf( String, *, {0}, * )", iS );
      Console.WriteLine( "Original      : {0}", myStr );
      Console.WriteLine( "No options    : {0}{1}", myT1, myStr.Substring( iS ) );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", iS ), -1 );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", iS ), -1 );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', iS ), -1 );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', iS ), -1 );
      Console.WriteLine( "Ordinal       : {0}{1}", myT1, myStr.Substring( iS ) );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", iS, CompareOptions.Ordinal ), -1 );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", iS, CompareOptions.Ordinal ), -1 );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', iS, CompareOptions.Ordinal ), -1 );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', iS, CompareOptions.Ordinal ), -1 );
      Console.WriteLine( "IgnoreCase    : {0}{1}", myT1, myStr.Substring( iS ) );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", iS, CompareOptions.IgnoreCase ), -1 );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", iS, CompareOptions.IgnoreCase ), -1 );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', iS, CompareOptions.IgnoreCase ), -1 );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', iS, CompareOptions.IgnoreCase ), -1 );

      myT1 = new String( '-', myStr.Length - iS - 1 );
      Console.WriteLine( "LastIndexOf( String, *, {0}, * )", iS );
      Console.WriteLine( "Original      : {0}", myStr );
      Console.WriteLine( "No options    : {0}{1}", myStr.Substring( 0, iS + 1 ), myT1 );
      PrintMarker( "           AE : ", -1, myComp.LastIndexOf( myStr, "AE", iS ) );
      PrintMarker( "           ae : ", -1, myComp.LastIndexOf( myStr, "ae", iS ) );
      PrintMarker( "            Æ : ", -1, myComp.LastIndexOf( myStr, 'Æ', iS ) );
      PrintMarker( "            æ : ", -1, myComp.LastIndexOf( myStr, 'æ', iS ) );
      Console.WriteLine( "Ordinal       : {0}{1}", myStr.Substring( 0, iS + 1 ), myT1 );
      PrintMarker( "           AE : ", -1, myComp.LastIndexOf( myStr, "AE", iS, CompareOptions.Ordinal ) );
      PrintMarker( "           ae : ", -1, myComp.LastIndexOf( myStr, "ae", iS, CompareOptions.Ordinal ) );
      PrintMarker( "            Æ : ", -1, myComp.LastIndexOf( myStr, 'Æ', iS, CompareOptions.Ordinal ) );
      PrintMarker( "            æ : ", -1, myComp.LastIndexOf( myStr, 'æ', iS, CompareOptions.Ordinal ) );
      Console.WriteLine( "IgnoreCase    : {0}{1}", myStr.Substring( 0, iS + 1 ), myT1 );
      PrintMarker( "           AE : ", -1, myComp.LastIndexOf( myStr, "AE", iS, CompareOptions.IgnoreCase ) );
      PrintMarker( "           ae : ", -1, myComp.LastIndexOf( myStr, "ae", iS, CompareOptions.IgnoreCase ) );
      PrintMarker( "            Æ : ", -1, myComp.LastIndexOf( myStr, 'Æ', iS, CompareOptions.IgnoreCase ) );
      PrintMarker( "            æ : ", -1, myComp.LastIndexOf( myStr, 'æ', iS, CompareOptions.IgnoreCase ) );

      // Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
      myStr = "Is \u0055\u0308 or \u0075\u0308 the same as \u00DC or \u00FC?";
      Console.WriteLine();

      myT1 = new String( '-', iS );
      Console.WriteLine( "IndexOf( String, *, {0}, * )", iS );
      Console.WriteLine( "Original      : {0}", myStr );
      Console.WriteLine( "No options    : {0}{1}", myT1, myStr.Substring( iS ) );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", iS ), -1 );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", iS ), -1 );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', iS ), -1 );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', iS ), -1 );
      Console.WriteLine( "Ordinal       : {0}{1}", myT1, myStr.Substring( iS ) );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", iS, CompareOptions.Ordinal ), -1 );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", iS, CompareOptions.Ordinal ), -1 );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', iS, CompareOptions.Ordinal ), -1 );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', iS, CompareOptions.Ordinal ), -1 );
      Console.WriteLine( "IgnoreCase    : {0}{1}", myT1, myStr.Substring( iS ) );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", iS, CompareOptions.IgnoreCase ), -1 );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", iS, CompareOptions.IgnoreCase ), -1 );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', iS, CompareOptions.IgnoreCase ), -1 );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', iS, CompareOptions.IgnoreCase ), -1 );

      myT1 = new String( '-', myStr.Length - iS - 1 );
      Console.WriteLine( "LastIndexOf( String, *, {0}, * )", iS );
      Console.WriteLine( "Original      : {0}", myStr );
      Console.WriteLine( "No options    : {0}{1}", myStr.Substring( 0, iS + 1 ), myT1 );
      PrintMarker( "           U\u0308 : ", -1, myComp.LastIndexOf( myStr, "U\u0308", iS ) );
      PrintMarker( "           u\u0308 : ", -1, myComp.LastIndexOf( myStr, "u\u0308", iS ) );
      PrintMarker( "            Ü : ", -1, myComp.LastIndexOf( myStr, 'Ü', iS ) );
      PrintMarker( "            ü : ", -1, myComp.LastIndexOf( myStr, 'ü', iS ) );
      Console.WriteLine( "Ordinal       : {0}{1}", myStr.Substring( 0, iS + 1 ), myT1 );
      PrintMarker( "           U\u0308 : ", -1, myComp.LastIndexOf( myStr, "U\u0308", iS, CompareOptions.Ordinal ) );
      PrintMarker( "           u\u0308 : ", -1, myComp.LastIndexOf( myStr, "u\u0308", iS, CompareOptions.Ordinal ) );
      PrintMarker( "            Ü : ", -1, myComp.LastIndexOf( myStr, 'Ü', iS, CompareOptions.Ordinal ) );
      PrintMarker( "            ü : ", -1, myComp.LastIndexOf( myStr, 'ü', iS, CompareOptions.Ordinal ) );
      Console.WriteLine( "IgnoreCase    : {0}{1}", myStr.Substring( 0, iS + 1 ), myT1 );
      PrintMarker( "           U\u0308 : ", -1, myComp.LastIndexOf( myStr, "U\u0308", iS, CompareOptions.IgnoreCase ) );
      PrintMarker( "           u\u0308 : ", -1, myComp.LastIndexOf( myStr, "u\u0308", iS, CompareOptions.IgnoreCase ) );
      PrintMarker( "            Ü : ", -1, myComp.LastIndexOf( myStr, 'Ü', iS, CompareOptions.IgnoreCase ) );
      PrintMarker( "            ü : ", -1, myComp.LastIndexOf( myStr, 'ü', iS, CompareOptions.IgnoreCase ) );

   }

   public static void PrintMarker( String Prefix, int First, int Last )  {

      // Determines the size of the array to create.
      int mySize;
      if ( Last > First )
         mySize = Last;
      else
         mySize = First;

      if ( mySize > -1 )  {

         // Creates an array of Char to hold the markers.
         Char[] myCharArr = new Char[mySize+1];

         // Inserts the appropriate markers.
         if ( First > -1 )
         myCharArr[First] = 'f';
         if ( Last > -1 )
            myCharArr[Last] = 'l';
         if ( First == Last )
         myCharArr[First] = 'b';

         // Displays the array of Char as a String.
         Console.WriteLine( "{0}{1}", Prefix, new String( myCharArr ) );

      }
      else
         Console.WriteLine( Prefix );

   }

}


/*
This code produces the following output.

IndexOf( String, *, 20, * )
Original      : Is AE or ae the same as Æ or æ?
No options    : -------------------- as Æ or æ?
           AE :                         f
           ae :                              f
            Æ :                         f
            æ :                              f
Ordinal       : -------------------- as Æ or æ?
           AE :
           ae :
            Æ :                         f
            æ :                              f
IgnoreCase    : -------------------- as Æ or æ?
           AE :                         f
           ae :                         f
            Æ :                         f
            æ :                         f
LastIndexOf( String, *, 20, * )
Original      : Is AE or ae the same as Æ or æ?
No options    : Is AE or ae the same ----------
           AE :    l
           ae :          l
            Æ :    l
            æ :          l
Ordinal       : Is AE or ae the same ----------
           AE :    l
           ae :          l
            Æ :
            æ :
IgnoreCase    : Is AE or ae the same ----------
           AE :          l
           ae :          l
            Æ :          l
            æ :          l

IndexOf( String, *, 20, * )
Original      : Is U" or u" the same as Ü or ü?
No options    : -------------------- as Ü or ü?
           U" :                         f
           u" :                              f
            Ü :                         f
            ü :                              f
Ordinal       : -------------------- as Ü or ü?
           U" :
           u" :
            Ü :                         f
            ü :                              f
IgnoreCase    : -------------------- as Ü or ü?
           U" :                         f
           u" :                         f
            Ü :                         f
            ü :                         f
LastIndexOf( String, *, 20, * )
Original      : Is U" or u" the same as Ü or ü?
No options    : Is U" or u" the same ----------
           U" :    l
           u" :          l
            Ü :    l
            ü :          l
Ordinal       : Is U" or u" the same ----------
           U" :    l
           u" :          l
            Ü :
            ü :
IgnoreCase    : Is U" or u" the same ----------
           U" :          l
           u" :          l
            Ü :          l
            ü :          l

*/
Imports System
Imports System.Globalization
Imports Microsoft.VisualBasic

Public Class SamplesCompareInfo

   Public Shared Sub Main()

      ' Creates CompareInfo for the InvariantCulture.
      Dim myComp As CompareInfo = CultureInfo.InvariantCulture.CompareInfo

      ' iS is the starting index of the substring.
      Dim [iS] As Integer = 20
      ' myT1 is the string used for padding.
      Dim myT1 As [String]

      ' Searches for the ligature Æ.
      Dim myStr As [String] = "Is AE or ae the same as Æ or æ?"
      Console.WriteLine()

      myT1 = New [String]("-"c, [iS])
      Console.WriteLine("IndexOf( String, *, {0}, * )", [iS])
      Console.WriteLine("Original      : {0}", myStr)
      Console.WriteLine("No options    : {0}{1}", myT1, myStr.Substring([iS]))
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", [iS]), - 1)
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", [iS]), - 1)
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, [iS]), - 1)
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, [iS]), - 1)
      Console.WriteLine("Ordinal       : {0}{1}", myT1, myStr.Substring([iS]))
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", [iS], CompareOptions.Ordinal), - 1)
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", [iS], CompareOptions.Ordinal), - 1)
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, [iS], CompareOptions.Ordinal), - 1)
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, [iS], CompareOptions.Ordinal), - 1)
      Console.WriteLine("IgnoreCase    : {0}{1}", myT1, myStr.Substring([iS]))
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", [iS], CompareOptions.IgnoreCase), - 1)
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", [iS], CompareOptions.IgnoreCase), - 1)
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, [iS], CompareOptions.IgnoreCase), - 1)
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, [iS], CompareOptions.IgnoreCase), - 1)

      myT1 = New [String]("-"c, myStr.Length - [iS] - 1)
      Console.WriteLine("LastIndexOf( String, *, {0}, * )", [iS])
      Console.WriteLine("Original      : {0}", myStr)
      Console.WriteLine("No options    : {0}{1}", myStr.Substring(0, [iS] + 1), myT1)
      PrintMarker("           AE : ", - 1, myComp.LastIndexOf(myStr, "AE", [iS]))
      PrintMarker("           ae : ", - 1, myComp.LastIndexOf(myStr, "ae", [iS]))
      PrintMarker("            Æ : ", - 1, myComp.LastIndexOf(myStr, "Æ"c, [iS]))
      PrintMarker("            æ : ", - 1, myComp.LastIndexOf(myStr, "æ"c, [iS]))
      Console.WriteLine("Ordinal       : {0}{1}", myStr.Substring(0, [iS] + 1), myT1)
      PrintMarker("           AE : ", - 1, myComp.LastIndexOf(myStr, "AE", [iS], CompareOptions.Ordinal))
      PrintMarker("           ae : ", - 1, myComp.LastIndexOf(myStr, "ae", [iS], CompareOptions.Ordinal))
      PrintMarker("            Æ : ", - 1, myComp.LastIndexOf(myStr, "Æ"c, [iS], CompareOptions.Ordinal))
      PrintMarker("            æ : ", - 1, myComp.LastIndexOf(myStr, "æ"c, [iS], CompareOptions.Ordinal))
      Console.WriteLine("IgnoreCase    : {0}{1}", myStr.Substring(0, [iS] + 1), myT1)
      PrintMarker("           AE : ", - 1, myComp.LastIndexOf(myStr, "AE", [iS], CompareOptions.IgnoreCase))
      PrintMarker("           ae : ", - 1, myComp.LastIndexOf(myStr, "ae", [iS], CompareOptions.IgnoreCase))
      PrintMarker("            Æ : ", - 1, myComp.LastIndexOf(myStr, "Æ"c, [iS], CompareOptions.IgnoreCase))
      PrintMarker("            æ : ", - 1, myComp.LastIndexOf(myStr, "æ"c, [iS], CompareOptions.IgnoreCase))

      ' Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
      myStr = "Is " & ChrW(&H0055) & ChrW(&H0308) & " or " & ChrW(&H0075) & ChrW(&H0308) & " the same as " & ChrW(&H00DC) & " or " & ChrW(&H00FC) & "?"
      Console.WriteLine()

      myT1 = New [String]("-"c, [iS])
      Console.WriteLine("IndexOf( String, *, {0}, * )", [iS])
      Console.WriteLine("Original      : {0}", myStr)
      Console.WriteLine("No options    : {0}{1}", myT1, myStr.Substring([iS]))
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), [iS]), - 1)
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), [iS]), - 1)
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, [iS]), - 1)
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, [iS]), - 1)
      Console.WriteLine("Ordinal       : {0}{1}", myT1, myStr.Substring([iS]))
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), [iS], CompareOptions.Ordinal), - 1)
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), [iS], CompareOptions.Ordinal), - 1)
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, [iS], CompareOptions.Ordinal), - 1)
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, [iS], CompareOptions.Ordinal), - 1)
      Console.WriteLine("IgnoreCase    : {0}{1}", myT1, myStr.Substring([iS]))
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), [iS], CompareOptions.IgnoreCase), - 1)
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), [iS], CompareOptions.IgnoreCase), - 1)
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, [iS], CompareOptions.IgnoreCase), - 1)
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, [iS], CompareOptions.IgnoreCase), - 1)

      myT1 = New [String]("-"c, myStr.Length - [iS] - 1)
      Console.WriteLine("LastIndexOf( String, *, {0}, * )", [iS])
      Console.WriteLine("Original      : {0}", myStr)
      Console.WriteLine("No options    : {0}{1}", myStr.Substring(0, [iS] + 1), myT1)
      PrintMarker("           U" & ChrW(&H0308) & " : ", - 1, myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), [iS]))
      PrintMarker("           u" & ChrW(&H0308) & " : ", - 1, myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), [iS]))
      PrintMarker("            Ü : ", - 1, myComp.LastIndexOf(myStr, "Ü"c, [iS]))
      PrintMarker("            ü : ", - 1, myComp.LastIndexOf(myStr, "ü"c, [iS]))
      Console.WriteLine("Ordinal       : {0}{1}", myStr.Substring(0, [iS] + 1), myT1)
      PrintMarker("           U" & ChrW(&H0308) & " : ", - 1, myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), [iS], CompareOptions.Ordinal))
      PrintMarker("           u" & ChrW(&H0308) & " : ", - 1, myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), [iS], CompareOptions.Ordinal))
      PrintMarker("            Ü : ", - 1, myComp.LastIndexOf(myStr, "Ü"c, [iS], CompareOptions.Ordinal))
      PrintMarker("            ü : ", - 1, myComp.LastIndexOf(myStr, "ü"c, [iS], CompareOptions.Ordinal))
      Console.WriteLine("IgnoreCase    : {0}{1}", myStr.Substring(0, [iS] + 1), myT1)
      PrintMarker("           U" & ChrW(&H0308) & " : ", - 1, myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), [iS], CompareOptions.IgnoreCase))
      PrintMarker("           u" & ChrW(&H0308) & " : ", - 1, myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), [iS], CompareOptions.IgnoreCase))
      PrintMarker("            Ü : ", - 1, myComp.LastIndexOf(myStr, "Ü"c, [iS], CompareOptions.IgnoreCase))
      PrintMarker("            ü : ", - 1, myComp.LastIndexOf(myStr, "ü"c, [iS], CompareOptions.IgnoreCase))

   End Sub 'Main

   Public Shared Sub PrintMarker(Prefix As [String], First As Integer, Last As Integer)

      ' Determines the size of the array to create.
      Dim mySize As Integer
      If Last > First Then
         mySize = Last
      Else
         mySize = First
      End If 

      If mySize > - 1 Then

         ' Creates an array of Char to hold the markers.
         Dim myCharArr(mySize + 1) As [Char]

         ' Inserts the appropriate markers.
         If First > - 1 Then
            myCharArr(First) = "f"c
         End If
         If Last > - 1 Then
            myCharArr(Last) = "l"c
         End If
         If First = Last Then
            myCharArr(First) = "b"c
         End If 

         ' Displays the array of Char as a String.
         Console.WriteLine("{0}{1}", Prefix, New [String](myCharArr))
      
      Else
         Console.WriteLine(Prefix)

      End If 

   End Sub 'PrintMarker

End Class 'SamplesCompareInfo 


'This code produces the following output.
'
'IndexOf( String, *, 20, * )
'Original      : Is AE or ae the same as Æ or æ?
'No options    : -------------------- as Æ or æ?
'           AE :                         f
'           ae :                              f
'            Æ :                         f
'            æ :                              f
'Ordinal       : -------------------- as Æ or æ?
'           AE :
'           ae :
'            Æ :                         f
'            æ :                              f
'IgnoreCase    : -------------------- as Æ or æ?
'           AE :                         f
'           ae :                         f
'            Æ :                         f
'            æ :                         f
'LastIndexOf( String, *, 20, * )
'Original      : Is AE or ae the same as Æ or æ?
'No options    : Is AE or ae the same ----------
'           AE :    l
'           ae :          l
'            Æ :    l
'            æ :          l
'Ordinal       : Is AE or ae the same ----------
'           AE :    l
'           ae :          l
'            Æ :
'            æ :
'IgnoreCase    : Is AE or ae the same ----------
'           AE :          l
'           ae :          l
'            Æ :          l
'            æ :          l
'
'IndexOf( String, *, 20, * )
'Original      : Is U" or u" the same as Ü or ü?
'No options    : -------------------- as Ü or ü?
'           U" :                         f
'           u" :                              f
'            Ü :                         f
'            ü :                              f
'Ordinal       : -------------------- as Ü or ü?
'           U" :
'           u" :
'            Ü :                         f
'            ü :                              f
'IgnoreCase    : -------------------- as Ü or ü?
'           U" :                         f
'           u" :                         f
'            Ü :                         f
'            ü :                         f
'LastIndexOf( String, *, 20, * )
'Original      : Is U" or u" the same as Ü or ü?
'No options    : Is U" or u" the same ----------
'           U" :    l
'           u" :          l
'            Ü :    l
'            ü :          l
'Ordinal       : Is U" or u" the same ----------
'           U" :    l
'           u" :          l
'            Ü :
'            ü :
'IgnoreCase    : Is U" or u" the same ----------
'           U" :          l
'           u" :          l
'            Ü :          l
'            ü :          l

Commenti

La stringa di origine viene cercata all' startIndex indietro a partire da e termina all'inizio della stringa.The source string is searched backward starting at startIndex and ending at the beginning of the string.

Questo overload esegue una ricerca con distinzione delle impostazioni cultura.This overload performs a culture-sensitive search. Se il carattere è un valore Unicode che rappresenta un carattere precomposto, ad esempio la legatura "Æ" (U + 00C6), può essere considerato equivalente a qualsiasi occorrenza dei componenti nella sequenza corretta, ad esempio "AE" (U + 0041, U + 0045), a seconda delle impostazioni cultura.If the character is a Unicode value representing a precomposed character, such as the ligature "Æ" (U+00C6), it might be considered equivalent to any occurrence of its components in the correct sequence, such as "AE" (U+0041, U+0045), depending on the culture. Per eseguire una ricerca ordinale (indipendente dalle impostazioni cultura), in cui un carattere viene considerato equivalente a un altro carattere solo se i valori Unicode sono uguali, è necessario chiamare uno degli overload con un parametro di tipo CompareOptions e usare il metodo Ordinal valore.To perform an ordinal (culture-insensitive) search, where a character is considered equivalent to another character only if the Unicode values are the same, you should call one of the overloads that has a parameter of type CompareOptions and use the Ordinal value. Gli overload di String.LastIndexOf che cercano un carattere eseguono una ricerca ordinale, mentre quelli che cercano una stringa eseguono una ricerca con distinzione delle impostazioni cultura.Overloads of String.LastIndexOf that search for a character perform an ordinal search, whereas those that search for a string perform a culture-sensitive search.

Nota

Quando possibile, è necessario chiamare i metodi di confronto tra stringhe con un parametro CompareOptions di tipo per specificare il tipo di confronto previsto.When possible, you should call string comparison methods that have a parameter of type CompareOptions to specify the kind of comparison expected. Come regola generale, usare le opzioni linguistiche (usando le impostazioni cultura correnti) per confrontare le stringhe visualizzate nell'interfaccia utente CompareOptions.Ordinal e CompareOptions.OrdinalIgnoreCase specificare o per i confronti di sicurezza.As a general rule, use linguistic options (using the current culture) for comparing strings displayed in the user interface and specify CompareOptions.Ordinal or CompareOptions.OrdinalIgnoreCase for security comparisons.

Note per i chiamanti

I set di caratteri includono caratteri ignorabili, ovvero caratteri che non vengono considerati quando si esegue un ordinamento linguistico o con distinzione delle impostazioni cultura.Character sets include ignorable characters, which are characters that are not considered when performing a linguistic or culture-sensitive sort. In una ricerca dipendente dalle impostazioni cultura, value se è un carattere ignorabile, il risultato è equivalente alla ricerca con il carattere rimosso.In a culture-sensitive search, if value is an ignorable character, the result is equivalent to searching with that character removed. In questo caso, il LastIndexOf(String, Char, Int32) metodo restituisce startIndexsempre, ovvero la posizione del carattere in cui inizia la ricerca.In this case, the LastIndexOf(String, Char, Int32) method always returns startIndex, which is the character position at which the search begins. Nell'esempio seguente viene usato il LastIndexOf(String, Char, Int32) metodo per trovare un segno meno (U + 00AD) che precede la "m" finale in due stringhe.In the following example, the LastIndexOf(String, Char, Int32) method is used to find a soft hyphen (U+00AD) that precedes the final "m" in two strings. Solo una delle stringhe contiene un segno meno facoltativo.Only one of the strings contains a soft hyphen. In entrambi i casi, poiché il trattino Soft è un carattere ignorabile, il metodo restituisce la posizione di indice della "m", che è il startIndexvalore di.In both cases, because the soft hyphen is an ignorable character, the method returns the index position of the "m", which is the value of startIndex.

[!code-csharpSystem.Globalization.CompareInfo.LastIndexOf#5] [!code-vbSystem.Globalization.CompareInfo.LastIndexOf#5][!code-csharpSystem.Globalization.CompareInfo.LastIndexOf#5] [!code-vbSystem.Globalization.CompareInfo.LastIndexOf#5]

Vedi anche

LastIndexOf(String, String) LastIndexOf(String, String) LastIndexOf(String, String) LastIndexOf(String, String)

Cerca la sottostringa specificata e restituisce l'indice in base zero dell'ultima occorrenza all'interno dell'intera stringa di origine.Searches for the specified substring and returns the zero-based index of the last occurrence within the entire source string.

public:
 virtual int LastIndexOf(System::String ^ source, System::String ^ value);
public virtual int LastIndexOf (string source, string value);
abstract member LastIndexOf : string * string -> int
override this.LastIndexOf : string * string -> int
Public Overridable Function LastIndexOf (source As String, value As String) As Integer

Parametri

source
String String String String

Stringa in cui effettuare la ricerca.The string to search.

value
String String String String

Stringa da individuare all'interno di source.The string to locate within source.

Restituisce

Indice in base zero dell'ultima occorrenza di value all'interno di source, se presente; in caso contrario, -1.The zero-based index of the last occurrence of value, if found, within source; otherwise, -1.

Eccezioni

source è null.source is null.

-oppure--or-

value è null.value is null.

Esempi

Nell'esempio seguente vengono determinati gli indici della prima e dell'ultima occorrenza di un carattere o di una sottostringa all'interno di una stringa.The following example determines the indexes of the first and last occurrences of a character or a substring within a string.

using namespace System;
using namespace System::Globalization;
void PrintMarker( String^ Prefix, int First, int Last )
{
   
   // Determines the size of the array to create.
   int mySize;
   if ( Last > First )
      mySize = Last;
   else
      mySize = First;

   if ( mySize > -1 )
   {
      
      // Creates an array of Char to hold the markers.
      array<Char>^myCharArr = gcnew array<Char>(mySize + 1);
      
      // Inserts the appropriate markers.
      if ( First > -1 )
            myCharArr[ First ] = 'f';
      if ( Last > -1 )
            myCharArr[ Last ] = 'l';
      if ( First == Last )
            myCharArr[ First ] = 'b';
      
      // Displays the array of Char as a String.
      Console::WriteLine( "{0}{1}", Prefix, gcnew String( myCharArr ) );
   }
   else
      Console::WriteLine( Prefix );
}

int main()
{
   
   // Creates CompareInfo for the InvariantCulture.
   CompareInfo^ myComp = CultureInfo::InvariantCulture->CompareInfo;
   
   // Searches for the ligature Æ.
   String^ myStr = "Is AE or ae the same as Æ or æ?";
   Console::WriteLine();
   Console::WriteLine( "No options    : {0}", myStr );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE" ), myComp->LastIndexOf( myStr, "AE" ) );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae" ), myComp->LastIndexOf( myStr, "ae" ) );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ' ), myComp->LastIndexOf( myStr, L'Æ' ) );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ' ), myComp->LastIndexOf( myStr, L'æ' ) );
   Console::WriteLine( "Ordinal       : {0}", myStr );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "AE", CompareOptions::Ordinal ) );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "ae", CompareOptions::Ordinal ) );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'Æ', CompareOptions::Ordinal ) );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'æ', CompareOptions::Ordinal ) );
   Console::WriteLine( "IgnoreCase    : {0}", myStr );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "AE", CompareOptions::IgnoreCase ) );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "ae", CompareOptions::IgnoreCase ) );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'Æ', CompareOptions::IgnoreCase ) );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'æ', CompareOptions::IgnoreCase ) );
   
   // Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
   myStr = "Is U\u0308 or u\u0308 the same as \u00DC or \u00FC?";
   Console::WriteLine();
   Console::WriteLine( "No options    : {0}", myStr );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308" ), myComp->LastIndexOf( myStr, "U\u0308" ) );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308" ), myComp->LastIndexOf( myStr, "u\u0308" ) );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü' ), myComp->LastIndexOf( myStr, L'Ü' ) );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü' ), myComp->LastIndexOf( myStr, L'ü' ) );
   Console::WriteLine( "Ordinal       : {0}", myStr );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "U\u0308", CompareOptions::Ordinal ) );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "u\u0308", CompareOptions::Ordinal ) );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'Ü', CompareOptions::Ordinal ) );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'ü', CompareOptions::Ordinal ) );
   Console::WriteLine( "IgnoreCase    : {0}", myStr );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "U\u0308", CompareOptions::IgnoreCase ) );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "u\u0308", CompareOptions::IgnoreCase ) );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'Ü', CompareOptions::IgnoreCase ) );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'ü', CompareOptions::IgnoreCase ) );
}

/*
This code produces the following output.

No options    : Is AE or ae the same as Æ or æ?
           AE :    f                    l
           ae :          f                   l
            Æ :    f                    l
            æ :          f                   l
Ordinal       : Is AE or ae the same as Æ or æ?
           AE :    b
           ae :          b
            Æ :                         b
            æ :                              b
IgnoreCase    : Is AE or ae the same as Æ or æ?
           AE :    f                         l
           ae :    f                         l
            Æ :    f                         l
            æ :    f                         l

No options    : Is U" or u" the same as Ü or ü?
           U" :    f                    l
           u" :          f                   l
            Ü :    f                    l
            ü :          f                   l
Ordinal       : Is U" or u" the same as Ü or ü?
           U" :    b
           u" :          b
            Ü :                         b
            ü :                              b
IgnoreCase    : Is U" or u" the same as Ü or ü?
           U" :    f                         l
           u" :    f                         l
            Ü :    f                         l
            ü :    f                         l

*/
using System;
using System.Globalization;

public class SamplesCompareInfo  {

   public static void Main()  {

      // Creates CompareInfo for the InvariantCulture.
      CompareInfo myComp = CultureInfo.InvariantCulture.CompareInfo;

      // Searches for the ligature Æ.
      String myStr = "Is AE or ae the same as Æ or æ?";
      Console.WriteLine();
      Console.WriteLine( "No options    : {0}", myStr );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE" ), myComp.LastIndexOf( myStr, "AE" ) );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae" ), myComp.LastIndexOf( myStr, "ae" ) );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ' ), myComp.LastIndexOf( myStr, 'Æ' ) );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ' ), myComp.LastIndexOf( myStr, 'æ' ) );
      Console.WriteLine( "Ordinal       : {0}", myStr );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "AE", CompareOptions.Ordinal ) );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "ae", CompareOptions.Ordinal ) );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'Æ', CompareOptions.Ordinal ) );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'æ', CompareOptions.Ordinal ) );
      Console.WriteLine( "IgnoreCase    : {0}", myStr );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "AE", CompareOptions.IgnoreCase ) );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "ae", CompareOptions.IgnoreCase ) );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'Æ', CompareOptions.IgnoreCase ) );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'æ', CompareOptions.IgnoreCase ) );

      // Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
      myStr = "Is \u0055\u0308 or \u0075\u0308 the same as \u00DC or \u00FC?";
      Console.WriteLine();
      Console.WriteLine( "No options    : {0}", myStr );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308" ), myComp.LastIndexOf( myStr, "U\u0308" ) );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308" ), myComp.LastIndexOf( myStr, "u\u0308" ) );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü' ), myComp.LastIndexOf( myStr, 'Ü' ) );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü' ), myComp.LastIndexOf( myStr, 'ü' ) );
      Console.WriteLine( "Ordinal       : {0}", myStr );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "U\u0308", CompareOptions.Ordinal ) );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "u\u0308", CompareOptions.Ordinal ) );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'Ü', CompareOptions.Ordinal ) );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'ü', CompareOptions.Ordinal ) );
      Console.WriteLine( "IgnoreCase    : {0}", myStr );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "U\u0308", CompareOptions.IgnoreCase ) );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "u\u0308", CompareOptions.IgnoreCase ) );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'Ü', CompareOptions.IgnoreCase ) );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'ü', CompareOptions.IgnoreCase ) );

   }

   public static void PrintMarker( String Prefix, int First, int Last )  {

      // Determines the size of the array to create.
      int mySize;
      if ( Last > First )
         mySize = Last;
      else
         mySize = First;

      if ( mySize > -1 )  {

         // Creates an array of Char to hold the markers.
         Char[] myCharArr = new Char[mySize+1];

         // Inserts the appropriate markers.
         if ( First > -1 )
         myCharArr[First] = 'f';
         if ( Last > -1 )
            myCharArr[Last] = 'l';
         if ( First == Last )
         myCharArr[First] = 'b';

         // Displays the array of Char as a String.
         Console.WriteLine( "{0}{1}", Prefix, new String( myCharArr ) );

      }
      else
         Console.WriteLine( Prefix );

   }

}


/*
This code produces the following output.

No options    : Is AE or ae the same as Æ or æ?
           AE :    f                    l
           ae :          f                   l
            Æ :    f                    l
            æ :          f                   l
Ordinal       : Is AE or ae the same as Æ or æ?
           AE :    b
           ae :          b
            Æ :                         b
            æ :                              b
IgnoreCase    : Is AE or ae the same as Æ or æ?
           AE :    f                         l
           ae :    f                         l
            Æ :    f                         l
            æ :    f                         l

No options    : Is U" or u" the same as Ü or ü?
           U" :    f                    l
           u" :          f                   l
            Ü :    f                    l
            ü :          f                   l
Ordinal       : Is U" or u" the same as Ü or ü?
           U" :    b
           u" :          b
            Ü :                         b
            ü :                              b
IgnoreCase    : Is U" or u" the same as Ü or ü?
           U" :    f                         l
           u" :    f                         l
            Ü :    f                         l
            ü :    f                         l

*/
Imports System
Imports System.Globalization
Imports Microsoft.VisualBasic

Public Class SamplesCompareInfo

   Public Shared Sub Main()

      ' Creates CompareInfo for the InvariantCulture.
      Dim myComp As CompareInfo = CultureInfo.InvariantCulture.CompareInfo

      ' Searches for the ligature Æ.
      Dim myStr As [String] = "Is AE or ae the same as Æ or æ?"
      Console.WriteLine()
      Console.WriteLine("No options    : {0}", myStr)
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE"), myComp.LastIndexOf(myStr, "AE"))
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae"), myComp.LastIndexOf(myStr, "ae"))
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c), myComp.LastIndexOf(myStr, "Æ"c))
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c), myComp.LastIndexOf(myStr, "æ"c))
      Console.WriteLine("Ordinal       : {0}", myStr)
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "AE", CompareOptions.Ordinal))
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "ae", CompareOptions.Ordinal))
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "Æ"c, CompareOptions.Ordinal))
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "æ"c, CompareOptions.Ordinal))
      Console.WriteLine("IgnoreCase    : {0}", myStr)
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "AE", CompareOptions.IgnoreCase))
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "ae", CompareOptions.IgnoreCase))
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "Æ"c, CompareOptions.IgnoreCase))
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "æ"c, CompareOptions.IgnoreCase))

      ' Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
      myStr = "Is " & ChrW(&H0055) & ChrW(&H0308) & " or " & ChrW(&H0075) & ChrW(&H0308) & " the same as " & ChrW(&H00DC) & " or " & ChrW(&H00FC) & "?"
      Console.WriteLine()
      Console.WriteLine("No options    : {0}", myStr)
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308)), myComp.LastIndexOf(myStr, "U" & ChrW(&H0308)))
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308)), myComp.LastIndexOf(myStr, "u" & ChrW(&H0308)))
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c), myComp.LastIndexOf(myStr, "Ü"c))
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c), myComp.LastIndexOf(myStr, "ü"c))
      Console.WriteLine("Ordinal       : {0}", myStr)
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), CompareOptions.Ordinal))
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), CompareOptions.Ordinal))
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "Ü"c, CompareOptions.Ordinal))
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "ü"c, CompareOptions.Ordinal))
      Console.WriteLine("IgnoreCase    : {0}", myStr)
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), CompareOptions.IgnoreCase))
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), CompareOptions.IgnoreCase))
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "Ü"c, CompareOptions.IgnoreCase))
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "ü"c, CompareOptions.IgnoreCase))

   End Sub 'Main

   Public Shared Sub PrintMarker(Prefix As [String], First As Integer, Last As Integer)

      ' Determines the size of the array to create.
      Dim mySize As Integer
      If Last > First Then
         mySize = Last
      Else
         mySize = First
      End If 

      If mySize > - 1 Then

         ' Creates an array of Char to hold the markers.
         Dim myCharArr(mySize + 1) As [Char]

         ' Inserts the appropriate markers.
         If First > - 1 Then
            myCharArr(First) = "f"c
         End If
         If Last > - 1 Then
            myCharArr(Last) = "l"c
         End If
         If First = Last Then
            myCharArr(First) = "b"c
         End If 
         ' Displays the array of Char as a String.
         Console.WriteLine("{0}{1}", Prefix, New [String](myCharArr))

      Else
         Console.WriteLine(Prefix)

      End If 

   End Sub 'PrintMarker

End Class 'SamplesCompareInfo 


'This code produces the following output.
'
'No options    : Is AE or ae the same as Æ or æ?
'           AE :    f                    l
'           ae :          f                   l
'            Æ :    f                    l
'            æ :          f                   l
'Ordinal       : Is AE or ae the same as Æ or æ?
'           AE :    b
'           ae :          b
'            Æ :                         b
'            æ :                              b
'IgnoreCase    : Is AE or ae the same as Æ or æ?
'           AE :    f                         l
'           ae :    f                         l
'            Æ :    f                         l
'            æ :    f                         l
'
'No options    : Is U" or u" the same as Ü or ü?
'           U" :    f                    l
'           u" :          f                   l
'            Ü :    f                    l
'            ü :          f                   l
'Ordinal       : Is U" or u" the same as Ü or ü?
'           U" :    b
'           u" :          b
'            Ü :                         b
'            ü :                              b
'IgnoreCase    : Is U" or u" the same as Ü or ü?
'           U" :    f                         l
'           u" :    f                         l
'            Ü :    f                         l
'            ü :    f                         l

Commenti

La stringa di origine viene cercata all'indietro a partire dalla fine della stringa e termina all'inizio della stringa.The source string is searched backward starting at the end of the string and ending at the beginning of the string.

Questo overload esegue una ricerca con distinzione delle impostazioni cultura.This overload performs a culture-sensitive search. Un valore Unicode che rappresenta un carattere precomposto, ad esempio la legatura "Æ" (U + 00C6), può essere considerato equivalente a qualsiasi occorrenza dei componenti del carattere nella sequenza corretta, ad esempio "AE" (U + 0041, U + 0045), a seconda delle impostazioni cultura.A Unicode value representing a precomposed character, such as the ligature "Æ" (U+00C6), might be considered equivalent to any occurrence of the character's components in the correct sequence, such as "AE" (U+0041, U+0045), depending on the culture. Per eseguire una ricerca ordinale (indipendente dalle impostazioni cultura), in cui vengono confrontati i valori Unicode, è necessario chiamare uno degli overload con un parametro di tipo CompareOptions e usare il CompareOptions.Ordinal valore.To perform an ordinal (culture-insensitive) search, where the Unicode values are compared, you should call one of the overloads that has a parameter of type CompareOptions and use the CompareOptions.Ordinal value.

Nota

Quando possibile, è necessario chiamare i metodi di confronto tra stringhe con un parametro CompareOptions di tipo per specificare il tipo di confronto previsto.When possible, you should call string comparison methods that have a parameter of type CompareOptions to specify the kind of comparison expected. Come regola generale, usare le opzioni linguistiche (usando le impostazioni cultura correnti) per confrontare le stringhe visualizzate nell'interfaccia utente CompareOptions.Ordinal e CompareOptions.OrdinalIgnoreCase specificare o per i confronti di sicurezza.As a general rule, use linguistic options (using the current culture) for comparing strings displayed in the user interface and specify CompareOptions.Ordinal or CompareOptions.OrdinalIgnoreCase for security comparisons.

Note per i chiamanti

I set di caratteri includono caratteri ignorabili, ovvero caratteri che non vengono considerati quando si esegue un ordinamento linguistico o con distinzione delle impostazioni cultura.Character sets include ignorable characters, which are characters that are not considered when performing a linguistic or culture-sensitive sort. In una ricerca dipendente dalle impostazioni cultura, se value contiene un carattere ignorabile, il risultato è equivalente alla ricerca con il carattere rimosso.In a culture-sensitive search, if value contains an ignorable character, the result is equivalent to searching with that character removed. Se value è costituito solo da uno o più caratteri ignorabili LastIndexOf(String, String) , il metodo sourcerestituisce sempre.LengthIf value consists only of one or more ignorable characters, the LastIndexOf(String, String) method always returns source.Length -1, che rappresenta l'ultima posizione di indice sourcein.- 1, which represents the last index position in source. Nell'esempio seguente il LastIndexOf(String, String) metodo viene usato per trovare tre sottostringhe (un segno meno (U + 00AD), un trattino morbido seguito da "n" e un trattino morbido seguito da "m") in due stringhe.In the following example, the LastIndexOf(String, String) method is used to find three substrings (a soft hyphen (U+00AD), a soft hyphen followed by "n", and a soft hyphen followed by "m") in two strings. Solo una delle stringhe contiene un segno meno facoltativo.Only one of the strings contains a soft hyphen. In ogni caso, poiché il trattino morbido è un carattere ignorabile, il risultato è lo stesso di se il trattino non è stato incluso valuein.In each case, because the soft hyphen is an ignorable character, the result is the same as if the soft hyphen had not been included in value. Quando si cerca solo un trattino morbido, il metodo restituisce 6 e 5.When searching for a soft hyphen only, the method returns 6 and 5. Questi valori corrispondono all'indice dell'ultimo carattere nelle due stringhe.These values correspond to the index of the last character in the two strings.

[!code-csharpSystem.Globalization.CompareInfo.LastIndexOf#2] [!code-vbSystem.Globalization.CompareInfo.LastIndexOf#2][!code-csharpSystem.Globalization.CompareInfo.LastIndexOf#2] [!code-vbSystem.Globalization.CompareInfo.LastIndexOf#2]

Vedi anche

LastIndexOf(String, Char) LastIndexOf(String, Char) LastIndexOf(String, Char) LastIndexOf(String, Char)

Cerca il carattere specificato e restituisce l'indice in base zero dell'ultima occorrenza all'interno dell'intera stringa di origine.Searches for the specified character and returns the zero-based index of the last occurrence within the entire source string.

public:
 virtual int LastIndexOf(System::String ^ source, char value);
public virtual int LastIndexOf (string source, char value);
abstract member LastIndexOf : string * char -> int
override this.LastIndexOf : string * char -> int
Public Overridable Function LastIndexOf (source As String, value As Char) As Integer

Parametri

source
String String String String

Stringa in cui effettuare la ricerca.The string to search.

value
Char Char Char Char

Carattere da individuare all'interno di source.The character to locate within source.

Restituisce

Indice in base zero dell'ultima occorrenza di value all'interno di source, se presente; in caso contrario, -1.The zero-based index of the last occurrence of value, if found, within source; otherwise, -1.

Eccezioni

Esempi

Nell'esempio seguente vengono determinati gli indici della prima e dell'ultima occorrenza di un carattere o di una sottostringa all'interno di una stringa.The following example determines the indexes of the first and last occurrences of a character or a substring within a string.

using namespace System;
using namespace System::Globalization;
void PrintMarker( String^ Prefix, int First, int Last )
{
   
   // Determines the size of the array to create.
   int mySize;
   if ( Last > First )
      mySize = Last;
   else
      mySize = First;

   if ( mySize > -1 )
   {
      
      // Creates an array of Char to hold the markers.
      array<Char>^myCharArr = gcnew array<Char>(mySize + 1);
      
      // Inserts the appropriate markers.
      if ( First > -1 )
            myCharArr[ First ] = 'f';
      if ( Last > -1 )
            myCharArr[ Last ] = 'l';
      if ( First == Last )
            myCharArr[ First ] = 'b';
      
      // Displays the array of Char as a String.
      Console::WriteLine( "{0}{1}", Prefix, gcnew String( myCharArr ) );
   }
   else
      Console::WriteLine( Prefix );
}

int main()
{
   
   // Creates CompareInfo for the InvariantCulture.
   CompareInfo^ myComp = CultureInfo::InvariantCulture->CompareInfo;
   
   // Searches for the ligature Æ.
   String^ myStr = "Is AE or ae the same as Æ or æ?";
   Console::WriteLine();
   Console::WriteLine( "No options    : {0}", myStr );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE" ), myComp->LastIndexOf( myStr, "AE" ) );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae" ), myComp->LastIndexOf( myStr, "ae" ) );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ' ), myComp->LastIndexOf( myStr, L'Æ' ) );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ' ), myComp->LastIndexOf( myStr, L'æ' ) );
   Console::WriteLine( "Ordinal       : {0}", myStr );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "AE", CompareOptions::Ordinal ) );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "ae", CompareOptions::Ordinal ) );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'Æ', CompareOptions::Ordinal ) );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'æ', CompareOptions::Ordinal ) );
   Console::WriteLine( "IgnoreCase    : {0}", myStr );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "AE", CompareOptions::IgnoreCase ) );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "ae", CompareOptions::IgnoreCase ) );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'Æ', CompareOptions::IgnoreCase ) );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'æ', CompareOptions::IgnoreCase ) );
   
   // Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
   myStr = "Is U\u0308 or u\u0308 the same as \u00DC or \u00FC?";
   Console::WriteLine();
   Console::WriteLine( "No options    : {0}", myStr );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308" ), myComp->LastIndexOf( myStr, "U\u0308" ) );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308" ), myComp->LastIndexOf( myStr, "u\u0308" ) );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü' ), myComp->LastIndexOf( myStr, L'Ü' ) );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü' ), myComp->LastIndexOf( myStr, L'ü' ) );
   Console::WriteLine( "Ordinal       : {0}", myStr );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "U\u0308", CompareOptions::Ordinal ) );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, "u\u0308", CompareOptions::Ordinal ) );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'Ü', CompareOptions::Ordinal ) );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', CompareOptions::Ordinal ), myComp->LastIndexOf( myStr, L'ü', CompareOptions::Ordinal ) );
   Console::WriteLine( "IgnoreCase    : {0}", myStr );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "U\u0308", CompareOptions::IgnoreCase ) );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, "u\u0308", CompareOptions::IgnoreCase ) );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'Ü', CompareOptions::IgnoreCase ) );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', CompareOptions::IgnoreCase ), myComp->LastIndexOf( myStr, L'ü', CompareOptions::IgnoreCase ) );
}

/*
This code produces the following output.

No options    : Is AE or ae the same as Æ or æ?
           AE :    f                    l
           ae :          f                   l
            Æ :    f                    l
            æ :          f                   l
Ordinal       : Is AE or ae the same as Æ or æ?
           AE :    b
           ae :          b
            Æ :                         b
            æ :                              b
IgnoreCase    : Is AE or ae the same as Æ or æ?
           AE :    f                         l
           ae :    f                         l
            Æ :    f                         l
            æ :    f                         l

No options    : Is U" or u" the same as Ü or ü?
           U" :    f                    l
           u" :          f                   l
            Ü :    f                    l
            ü :          f                   l
Ordinal       : Is U" or u" the same as Ü or ü?
           U" :    b
           u" :          b
            Ü :                         b
            ü :                              b
IgnoreCase    : Is U" or u" the same as Ü or ü?
           U" :    f                         l
           u" :    f                         l
            Ü :    f                         l
            ü :    f                         l

*/
using System;
using System.Globalization;

public class SamplesCompareInfo  {

   public static void Main()  {

      // Creates CompareInfo for the InvariantCulture.
      CompareInfo myComp = CultureInfo.InvariantCulture.CompareInfo;

      // Searches for the ligature Æ.
      String myStr = "Is AE or ae the same as Æ or æ?";
      Console.WriteLine();
      Console.WriteLine( "No options    : {0}", myStr );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE" ), myComp.LastIndexOf( myStr, "AE" ) );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae" ), myComp.LastIndexOf( myStr, "ae" ) );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ' ), myComp.LastIndexOf( myStr, 'Æ' ) );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ' ), myComp.LastIndexOf( myStr, 'æ' ) );
      Console.WriteLine( "Ordinal       : {0}", myStr );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "AE", CompareOptions.Ordinal ) );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "ae", CompareOptions.Ordinal ) );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'Æ', CompareOptions.Ordinal ) );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'æ', CompareOptions.Ordinal ) );
      Console.WriteLine( "IgnoreCase    : {0}", myStr );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "AE", CompareOptions.IgnoreCase ) );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "ae", CompareOptions.IgnoreCase ) );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'Æ', CompareOptions.IgnoreCase ) );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'æ', CompareOptions.IgnoreCase ) );

      // Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
      myStr = "Is \u0055\u0308 or \u0075\u0308 the same as \u00DC or \u00FC?";
      Console.WriteLine();
      Console.WriteLine( "No options    : {0}", myStr );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308" ), myComp.LastIndexOf( myStr, "U\u0308" ) );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308" ), myComp.LastIndexOf( myStr, "u\u0308" ) );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü' ), myComp.LastIndexOf( myStr, 'Ü' ) );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü' ), myComp.LastIndexOf( myStr, 'ü' ) );
      Console.WriteLine( "Ordinal       : {0}", myStr );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "U\u0308", CompareOptions.Ordinal ) );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, "u\u0308", CompareOptions.Ordinal ) );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'Ü', CompareOptions.Ordinal ) );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', CompareOptions.Ordinal ), myComp.LastIndexOf( myStr, 'ü', CompareOptions.Ordinal ) );
      Console.WriteLine( "IgnoreCase    : {0}", myStr );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "U\u0308", CompareOptions.IgnoreCase ) );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, "u\u0308", CompareOptions.IgnoreCase ) );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'Ü', CompareOptions.IgnoreCase ) );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', CompareOptions.IgnoreCase ), myComp.LastIndexOf( myStr, 'ü', CompareOptions.IgnoreCase ) );

   }

   public static void PrintMarker( String Prefix, int First, int Last )  {

      // Determines the size of the array to create.
      int mySize;
      if ( Last > First )
         mySize = Last;
      else
         mySize = First;

      if ( mySize > -1 )  {

         // Creates an array of Char to hold the markers.
         Char[] myCharArr = new Char[mySize+1];

         // Inserts the appropriate markers.
         if ( First > -1 )
         myCharArr[First] = 'f';
         if ( Last > -1 )
            myCharArr[Last] = 'l';
         if ( First == Last )
         myCharArr[First] = 'b';

         // Displays the array of Char as a String.
         Console.WriteLine( "{0}{1}", Prefix, new String( myCharArr ) );

      }
      else
         Console.WriteLine( Prefix );

   }

}


/*
This code produces the following output.

No options    : Is AE or ae the same as Æ or æ?
           AE :    f                    l
           ae :          f                   l
            Æ :    f                    l
            æ :          f                   l
Ordinal       : Is AE or ae the same as Æ or æ?
           AE :    b
           ae :          b
            Æ :                         b
            æ :                              b
IgnoreCase    : Is AE or ae the same as Æ or æ?
           AE :    f                         l
           ae :    f                         l
            Æ :    f                         l
            æ :    f                         l

No options    : Is U" or u" the same as Ü or ü?
           U" :    f                    l
           u" :          f                   l
            Ü :    f                    l
            ü :          f                   l
Ordinal       : Is U" or u" the same as Ü or ü?
           U" :    b
           u" :          b
            Ü :                         b
            ü :                              b
IgnoreCase    : Is U" or u" the same as Ü or ü?
           U" :    f                         l
           u" :    f                         l
            Ü :    f                         l
            ü :    f                         l

*/
Imports System
Imports System.Globalization
Imports Microsoft.VisualBasic

Public Class SamplesCompareInfo

   Public Shared Sub Main()

      ' Creates CompareInfo for the InvariantCulture.
      Dim myComp As CompareInfo = CultureInfo.InvariantCulture.CompareInfo

      ' Searches for the ligature Æ.
      Dim myStr As [String] = "Is AE or ae the same as Æ or æ?"
      Console.WriteLine()
      Console.WriteLine("No options    : {0}", myStr)
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE"), myComp.LastIndexOf(myStr, "AE"))
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae"), myComp.LastIndexOf(myStr, "ae"))
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c), myComp.LastIndexOf(myStr, "Æ"c))
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c), myComp.LastIndexOf(myStr, "æ"c))
      Console.WriteLine("Ordinal       : {0}", myStr)
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "AE", CompareOptions.Ordinal))
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "ae", CompareOptions.Ordinal))
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "Æ"c, CompareOptions.Ordinal))
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "æ"c, CompareOptions.Ordinal))
      Console.WriteLine("IgnoreCase    : {0}", myStr)
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "AE", CompareOptions.IgnoreCase))
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "ae", CompareOptions.IgnoreCase))
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "Æ"c, CompareOptions.IgnoreCase))
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "æ"c, CompareOptions.IgnoreCase))

      ' Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
      myStr = "Is " & ChrW(&H0055) & ChrW(&H0308) & " or " & ChrW(&H0075) & ChrW(&H0308) & " the same as " & ChrW(&H00DC) & " or " & ChrW(&H00FC) & "?"
      Console.WriteLine()
      Console.WriteLine("No options    : {0}", myStr)
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308)), myComp.LastIndexOf(myStr, "U" & ChrW(&H0308)))
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308)), myComp.LastIndexOf(myStr, "u" & ChrW(&H0308)))
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c), myComp.LastIndexOf(myStr, "Ü"c))
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c), myComp.LastIndexOf(myStr, "ü"c))
      Console.WriteLine("Ordinal       : {0}", myStr)
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), CompareOptions.Ordinal))
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), CompareOptions.Ordinal))
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "Ü"c, CompareOptions.Ordinal))
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, CompareOptions.Ordinal), myComp.LastIndexOf(myStr, "ü"c, CompareOptions.Ordinal))
      Console.WriteLine("IgnoreCase    : {0}", myStr)
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), CompareOptions.IgnoreCase))
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), CompareOptions.IgnoreCase))
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "Ü"c, CompareOptions.IgnoreCase))
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, CompareOptions.IgnoreCase), myComp.LastIndexOf(myStr, "ü"c, CompareOptions.IgnoreCase))

   End Sub 'Main

   Public Shared Sub PrintMarker(Prefix As [String], First As Integer, Last As Integer)

      ' Determines the size of the array to create.
      Dim mySize As Integer
      If Last > First Then
         mySize = Last
      Else
         mySize = First
      End If 

      If mySize > - 1 Then

         ' Creates an array of Char to hold the markers.
         Dim myCharArr(mySize + 1) As [Char]

         ' Inserts the appropriate markers.
         If First > - 1 Then
            myCharArr(First) = "f"c
         End If
         If Last > - 1 Then
            myCharArr(Last) = "l"c
         End If
         If First = Last Then
            myCharArr(First) = "b"c
         End If 
         ' Displays the array of Char as a String.
         Console.WriteLine("{0}{1}", Prefix, New [String](myCharArr))

      Else
         Console.WriteLine(Prefix)

      End If 

   End Sub 'PrintMarker

End Class 'SamplesCompareInfo 


'This code produces the following output.
'
'No options    : Is AE or ae the same as Æ or æ?
'           AE :    f                    l
'           ae :          f                   l
'            Æ :    f                    l
'            æ :          f                   l
'Ordinal       : Is AE or ae the same as Æ or æ?
'           AE :    b
'           ae :          b
'            Æ :                         b
'            æ :                              b
'IgnoreCase    : Is AE or ae the same as Æ or æ?
'           AE :    f                         l
'           ae :    f                         l
'            Æ :    f                         l
'            æ :    f                         l
'
'No options    : Is U" or u" the same as Ü or ü?
'           U" :    f                    l
'           u" :          f                   l
'            Ü :    f                    l
'            ü :          f                   l
'Ordinal       : Is U" or u" the same as Ü or ü?
'           U" :    b
'           u" :          b
'            Ü :                         b
'            ü :                              b
'IgnoreCase    : Is U" or u" the same as Ü or ü?
'           U" :    f                         l
'           u" :    f                         l
'            Ü :    f                         l
'            ü :    f                         l

Commenti

La stringa di origine viene cercata all'indietro a partire dalla fine della stringa e termina all'inizio della stringa.The source string is searched backward starting at the end of the string and ending at the beginning of the string.

Questo overload esegue una ricerca con distinzione delle impostazioni cultura.This overload performs a culture-sensitive search. Se il carattere è un valore Unicode che rappresenta un carattere precomposto, ad esempio la legatura "Æ" (U + 00C6), può essere considerato equivalente a qualsiasi occorrenza dei componenti nella sequenza corretta, ad esempio "AE" (U + 0041, U + 0045), a seconda delle impostazioni cultura.If the character is a Unicode value representing a precomposed character, such as the ligature "Æ" (U+00C6), it might be considered equivalent to any occurrence of its components in the correct sequence, such as "AE" (U+0041, U+0045), depending on the culture. Per eseguire una ricerca ordinale (indipendente dalle impostazioni cultura), in cui un carattere viene considerato equivalente a un altro carattere solo se i valori Unicode sono uguali, è necessario chiamare uno degli overload con un parametro di tipo CompareOptions e usare il metodo Ordinal valore.To perform an ordinal (culture-insensitive) search, where a character is considered equivalent to another character only if the Unicode values are the same, you should call one of the overloads that has a parameter of type CompareOptions and use the Ordinal value. Gli overload di String.LastIndexOf che cercano un carattere eseguono una ricerca ordinale, mentre quelli che cercano una stringa eseguono una ricerca con distinzione delle impostazioni cultura.Overloads of String.LastIndexOf that search for a character perform an ordinal search, whereas those that search for a string perform a culture-sensitive search.

Nota

Quando possibile, è necessario chiamare i metodi di confronto tra stringhe con un parametro CompareOptions di tipo per specificare il tipo di confronto previsto.When possible, you should call string comparison methods that have a parameter of type CompareOptions to specify the kind of comparison expected. Come regola generale, usare le opzioni linguistiche (usando le impostazioni cultura correnti) per confrontare le stringhe visualizzate nell'interfaccia utente CompareOptions.Ordinal e CompareOptions.OrdinalIgnoreCase specificare o per i confronti di sicurezza.As a general rule, use linguistic options (using the current culture) for comparing strings displayed in the user interface and specify CompareOptions.Ordinal or CompareOptions.OrdinalIgnoreCase for security comparisons.

Note per i chiamanti

I set di caratteri includono caratteri ignorabili, ovvero caratteri che non vengono considerati quando si esegue un ordinamento linguistico o con distinzione delle impostazioni cultura.Character sets include ignorable characters, which are characters that are not considered when performing a linguistic or culture-sensitive sort. In una ricerca dipendente dalle impostazioni cultura, value se è un carattere ignorabile, il risultato è equivalente alla ricerca con il carattere rimosso.In a culture-sensitive search, if value is an ignorable character, the result is equivalent to searching with that character removed. In questo caso, il LastIndexOf(String, Char) metodo restituisce sempre l'ultima posizione di indice source in per indicare che la corrispondenza viene trovata alla fine di source.In this case, the LastIndexOf(String, Char) method always returns the last index position in source to indicate that the match is found at the end of source. Nell'esempio seguente viene usato il LastIndexOf(String, Char) metodo per trovare il trattino (U + 00AD) flessibile in due stringhe.In the following example, the LastIndexOf(String, Char) method is used to find the soft hyphen (U+00AD) in two strings. Solo una delle stringhe contiene un segno meno facoltativo.Only one of the strings contains a soft hyphen. In entrambi i casi, poiché il trattino Soft è un carattere ignorabile, il metodo restituisce l'ultima posizione di indice nella stringa per indicare che è stata trovata una corrispondenza alla fine della stringa.In both cases, because the soft hyphen is an ignorable character, the method returns the last index position in the string to indicate that it has found a match at the end of the string.

[!code-csharpSystem.Globalization.CompareInfo.LastIndexOf#3] [!code-vbSystem.Globalization.CompareInfo.LastIndexOf#3][!code-csharpSystem.Globalization.CompareInfo.LastIndexOf#3] [!code-vbSystem.Globalization.CompareInfo.LastIndexOf#3]

Vedi anche

LastIndexOf(String, String, Int32) LastIndexOf(String, String, Int32) LastIndexOf(String, String, Int32) LastIndexOf(String, String, Int32)

Cerca la sottostringa specificata e restituisce l'indice in base zero dell'ultima occorrenza all'interno della sezione della stringa di origine compresa tra l'inizio della stringa e l'indice specificato.Searches for the specified substring and returns the zero-based index of the last occurrence within the section of the source string that extends from the beginning of the string to the specified index.

public:
 virtual int LastIndexOf(System::String ^ source, System::String ^ value, int startIndex);
public virtual int LastIndexOf (string source, string value, int startIndex);
abstract member LastIndexOf : string * string * int -> int
override this.LastIndexOf : string * string * int -> int
Public Overridable Function LastIndexOf (source As String, value As String, startIndex As Integer) As Integer

Parametri

source
String String String String

Stringa in cui effettuare la ricerca.The string to search.

value
String String String String

Stringa da individuare all'interno di source.The string to locate within source.

startIndex
Int32 Int32 Int32 Int32

Indice iniziale in base zero della ricerca all'indietro.The zero-based starting index of the backward search.

Restituisce

Indice in base zero dell'ultima occorrenza di value, se presente, all'interno della sezione di source compresa tra l'inizio di source e startIndex; in caso contrario, -1.The zero-based index of the last occurrence of value, if found, within the section of source that extends from the beginning of source to startIndex; otherwise, -1. Restituisce startIndex se value è un carattere che è possibile ignorare.Returns startIndex if value is an ignorable character.

Eccezioni

source è null.source is null.

-oppure--or-

value è null.value is null.

startIndex non è compreso nell'intervallo di indici validi per source.startIndex is outside the range of valid indexes for source.

Esempi

Nell'esempio seguente vengono determinati gli indici della prima e dell'ultima occorrenza di un carattere o di una sottostringa all'interno di una parte di una stringa.The following example determines the indexes of the first and last occurrences of a character or a substring within a portion of a string. Si noti IndexOf che LastIndexOf e eseguono la ricerca in parti diverse della stringa, anche con lo startIndex stesso parametro.Note that IndexOf and LastIndexOf are searching in different portions of the string, even with the same startIndex parameter.

using namespace System;
using namespace System::Globalization;
void PrintMarker( String^ Prefix, int First, int Last )
{
   
   // Determines the size of the array to create.
   int mySize;
   if ( Last > First )
      mySize = Last;
   else
      mySize = First;

   if ( mySize > -1 )
   {
      
      // Creates an array of Char to hold the markers.
      array<Char>^myCharArr = gcnew array<Char>(mySize + 1);
      
      // Inserts the appropriate markers.
      if ( First > -1 )
            myCharArr[ First ] = 'f';
      if ( Last > -1 )
            myCharArr[ Last ] = 'l';
      if ( First == Last )
            myCharArr[ First ] = 'b';
      
      // Displays the array of Char as a String.
      Console::WriteLine( "{0}{1}", Prefix, gcnew String( myCharArr ) );
   }
   else
      Console::WriteLine( Prefix );
}

int main()
{
   
   // Creates CompareInfo for the InvariantCulture.
   CompareInfo^ myComp = CultureInfo::InvariantCulture->CompareInfo;
   
   // iS is the starting index of the substring.
   int iS = 20;
   
   // myT1 is the string used for padding.
   String^ myT1;
   
   // Searches for the ligature Æ.
   String^ myStr = "Is AE or ae the same as Æ or æ?";
   Console::WriteLine();
   myT1 = gcnew String( '-',iS );
   Console::WriteLine( "IndexOf( String, *, {0}, * )", iS );
   Console::WriteLine( "Original      : {0}", myStr );
   Console::WriteLine( "No options    : {0}{1}", myT1, myStr->Substring( iS ) );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", iS ), -1 );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", iS ), -1 );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', iS ), -1 );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', iS ), -1 );
   Console::WriteLine( "Ordinal       : {0}{1}", myT1, myStr->Substring( iS ) );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", iS, CompareOptions::Ordinal ), -1 );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", iS, CompareOptions::Ordinal ), -1 );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', iS, CompareOptions::Ordinal ), -1 );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', iS, CompareOptions::Ordinal ), -1 );
   Console::WriteLine( "IgnoreCase    : {0}{1}", myT1, myStr->Substring( iS ) );
   PrintMarker( "           AE : ", myComp->IndexOf( myStr, "AE", iS, CompareOptions::IgnoreCase ), -1 );
   PrintMarker( "           ae : ", myComp->IndexOf( myStr, "ae", iS, CompareOptions::IgnoreCase ), -1 );
   PrintMarker( "            Æ : ", myComp->IndexOf( myStr, L'Æ', iS, CompareOptions::IgnoreCase ), -1 );
   PrintMarker( "            æ : ", myComp->IndexOf( myStr, L'æ', iS, CompareOptions::IgnoreCase ), -1 );
   myT1 = gcnew String( '-',myStr->Length - iS - 1 );
   Console::WriteLine( "LastIndexOf( String, *, {0}, * )", iS );
   Console::WriteLine( "Original      : {0}", myStr );
   Console::WriteLine( "No options    : {0}{1}", myStr->Substring( 0, iS + 1 ), myT1 );
   PrintMarker( "           AE : ", -1, myComp->LastIndexOf( myStr, "AE", iS ) );
   PrintMarker( "           ae : ", -1, myComp->LastIndexOf( myStr, "ae", iS ) );
   PrintMarker( "            Æ : ", -1, myComp->LastIndexOf( myStr, L'Æ', iS ) );
   PrintMarker( "            æ : ", -1, myComp->LastIndexOf( myStr, L'æ', iS ) );
   Console::WriteLine( "Ordinal       : {0}{1}", myStr->Substring( 0, iS + 1 ), myT1 );
   PrintMarker( "           AE : ", -1, myComp->LastIndexOf( myStr, "AE", iS, CompareOptions::Ordinal ) );
   PrintMarker( "           ae : ", -1, myComp->LastIndexOf( myStr, "ae", iS, CompareOptions::Ordinal ) );
   PrintMarker( "            Æ : ", -1, myComp->LastIndexOf( myStr, L'Æ', iS, CompareOptions::Ordinal ) );
   PrintMarker( "            æ : ", -1, myComp->LastIndexOf( myStr, L'æ', iS, CompareOptions::Ordinal ) );
   Console::WriteLine( "IgnoreCase    : {0}{1}", myStr->Substring( 0, iS + 1 ), myT1 );
   PrintMarker( "           AE : ", -1, myComp->LastIndexOf( myStr, "AE", iS, CompareOptions::IgnoreCase ) );
   PrintMarker( "           ae : ", -1, myComp->LastIndexOf( myStr, "ae", iS, CompareOptions::IgnoreCase ) );
   PrintMarker( "            Æ : ", -1, myComp->LastIndexOf( myStr, L'Æ', iS, CompareOptions::IgnoreCase ) );
   PrintMarker( "            æ : ", -1, myComp->LastIndexOf( myStr, L'æ', iS, CompareOptions::IgnoreCase ) );
   
   // Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
   myStr = "Is U\u0308 or u\u0308 the same as \u00DC or \u00FC?";
   Console::WriteLine();
   myT1 = gcnew String( '-',iS );
   Console::WriteLine( "IndexOf( String, *, {0}, * )", iS );
   Console::WriteLine( "Original      : {0}", myStr );
   Console::WriteLine( "No options    : {0}{1}", myT1, myStr->Substring( iS ) );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", iS ), -1 );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", iS ), -1 );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', iS ), -1 );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', iS ), -1 );
   Console::WriteLine( "Ordinal       : {0}{1}", myT1, myStr->Substring( iS ) );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", iS, CompareOptions::Ordinal ), -1 );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", iS, CompareOptions::Ordinal ), -1 );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', iS, CompareOptions::Ordinal ), -1 );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', iS, CompareOptions::Ordinal ), -1 );
   Console::WriteLine( "IgnoreCase    : {0}{1}", myT1, myStr->Substring( iS ) );
   PrintMarker( "           U\u0308 : ", myComp->IndexOf( myStr, "U\u0308", iS, CompareOptions::IgnoreCase ), -1 );
   PrintMarker( "           u\u0308 : ", myComp->IndexOf( myStr, "u\u0308", iS, CompareOptions::IgnoreCase ), -1 );
   PrintMarker( "            Ü : ", myComp->IndexOf( myStr, L'Ü', iS, CompareOptions::IgnoreCase ), -1 );
   PrintMarker( "            ü : ", myComp->IndexOf( myStr, L'ü', iS, CompareOptions::IgnoreCase ), -1 );
   myT1 = gcnew String( '-',myStr->Length - iS - 1 );
   Console::WriteLine( "LastIndexOf( String, *, {0}, * )", iS );
   Console::WriteLine( "Original      : {0}", myStr );
   Console::WriteLine( "No options    : {0}{1}", myStr->Substring( 0, iS + 1 ), myT1 );
   PrintMarker( "           U\u0308 : ", -1, myComp->LastIndexOf( myStr, "U\u0308", iS ) );
   PrintMarker( "           u\u0308 : ", -1, myComp->LastIndexOf( myStr, "u\u0308", iS ) );
   PrintMarker( "            Ü : ", -1, myComp->LastIndexOf( myStr, L'Ü', iS ) );
   PrintMarker( "            ü : ", -1, myComp->LastIndexOf( myStr, L'ü', iS ) );
   Console::WriteLine( "Ordinal       : {0}{1}", myStr->Substring( 0, iS + 1 ), myT1 );
   PrintMarker( "           U\u0308 : ", -1, myComp->LastIndexOf( myStr, "U\u0308", iS, CompareOptions::Ordinal ) );
   PrintMarker( "           u\u0308 : ", -1, myComp->LastIndexOf( myStr, "u\u0308", iS, CompareOptions::Ordinal ) );
   PrintMarker( "            Ü : ", -1, myComp->LastIndexOf( myStr, L'Ü', iS, CompareOptions::Ordinal ) );
   PrintMarker( "            ü : ", -1, myComp->LastIndexOf( myStr, L'ü', iS, CompareOptions::Ordinal ) );
   Console::WriteLine( "IgnoreCase    : {0}{1}", myStr->Substring( 0, iS + 1 ), myT1 );
   PrintMarker( "           U\u0308 : ", -1, myComp->LastIndexOf( myStr, "U\u0308", iS, CompareOptions::IgnoreCase ) );
   PrintMarker( "           u\u0308 : ", -1, myComp->LastIndexOf( myStr, "u\u0308", iS, CompareOptions::IgnoreCase ) );
   PrintMarker( "            Ü : ", -1, myComp->LastIndexOf( myStr, L'Ü', iS, CompareOptions::IgnoreCase ) );
   PrintMarker( "            ü : ", -1, myComp->LastIndexOf( myStr, L'ü', iS, CompareOptions::IgnoreCase ) );
}

/*
This code produces the following output.

IndexOf( String, *, 20, * )
Original      : Is AE or ae the same as Æ or æ?
No options    : -------------------- as Æ or æ?
           AE :                         f
           ae :                              f
            Æ :                         f
            æ :                              f
Ordinal       : -------------------- as Æ or æ?
           AE :
           ae :
            Æ :                         f
            æ :                              f
IgnoreCase    : -------------------- as Æ or æ?
           AE :                         f
           ae :                         f
            Æ :                         f
            æ :                         f
LastIndexOf( String, *, 20, * )
Original      : Is AE or ae the same as Æ or æ?
No options    : Is AE or ae the same ----------
           AE :    l
           ae :          l
            Æ :    l
            æ :          l
Ordinal       : Is AE or ae the same ----------
           AE :    l
           ae :          l
            Æ :
            æ :
IgnoreCase    : Is AE or ae the same ----------
           AE :          l
           ae :          l
            Æ :          l
            æ :          l

IndexOf( String, *, 20, * )
Original      : Is U" or u" the same as Ü or ü?
No options    : -------------------- as Ü or ü?
           U" :                         f
           u" :                              f
            Ü :                         f
            ü :                              f
Ordinal       : -------------------- as Ü or ü?
           U" :
           u" :
            Ü :                         f
            ü :                              f
IgnoreCase    : -------------------- as Ü or ü?
           U" :                         f
           u" :                         f
            Ü :                         f
            ü :                         f
LastIndexOf( String, *, 20, * )
Original      : Is U" or u" the same as Ü or ü?
No options    : Is U" or u" the same ----------
           U" :    l
           u" :          l
            Ü :    l
            ü :          l
Ordinal       : Is U" or u" the same ----------
           U" :    l
           u" :          l
            Ü :
            ü :
IgnoreCase    : Is U" or u" the same ----------
           U" :          l
           u" :          l
            Ü :          l
            ü :          l

*/
using System;
using System.Globalization;

public class SamplesCompareInfo  {

   public static void Main()  {

      // Creates CompareInfo for the InvariantCulture.
      CompareInfo myComp = CultureInfo.InvariantCulture.CompareInfo;

      // iS is the starting index of the substring.
      int iS = 20;
      // myT1 is the string used for padding.
      String myT1;

      // Searches for the ligature Æ.
      String myStr = "Is AE or ae the same as Æ or æ?";
      Console.WriteLine();

      myT1 = new String( '-', iS );
      Console.WriteLine( "IndexOf( String, *, {0}, * )", iS );
      Console.WriteLine( "Original      : {0}", myStr );
      Console.WriteLine( "No options    : {0}{1}", myT1, myStr.Substring( iS ) );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", iS ), -1 );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", iS ), -1 );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', iS ), -1 );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', iS ), -1 );
      Console.WriteLine( "Ordinal       : {0}{1}", myT1, myStr.Substring( iS ) );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", iS, CompareOptions.Ordinal ), -1 );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", iS, CompareOptions.Ordinal ), -1 );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', iS, CompareOptions.Ordinal ), -1 );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', iS, CompareOptions.Ordinal ), -1 );
      Console.WriteLine( "IgnoreCase    : {0}{1}", myT1, myStr.Substring( iS ) );
      PrintMarker( "           AE : ", myComp.IndexOf( myStr, "AE", iS, CompareOptions.IgnoreCase ), -1 );
      PrintMarker( "           ae : ", myComp.IndexOf( myStr, "ae", iS, CompareOptions.IgnoreCase ), -1 );
      PrintMarker( "            Æ : ", myComp.IndexOf( myStr, 'Æ', iS, CompareOptions.IgnoreCase ), -1 );
      PrintMarker( "            æ : ", myComp.IndexOf( myStr, 'æ', iS, CompareOptions.IgnoreCase ), -1 );

      myT1 = new String( '-', myStr.Length - iS - 1 );
      Console.WriteLine( "LastIndexOf( String, *, {0}, * )", iS );
      Console.WriteLine( "Original      : {0}", myStr );
      Console.WriteLine( "No options    : {0}{1}", myStr.Substring( 0, iS + 1 ), myT1 );
      PrintMarker( "           AE : ", -1, myComp.LastIndexOf( myStr, "AE", iS ) );
      PrintMarker( "           ae : ", -1, myComp.LastIndexOf( myStr, "ae", iS ) );
      PrintMarker( "            Æ : ", -1, myComp.LastIndexOf( myStr, 'Æ', iS ) );
      PrintMarker( "            æ : ", -1, myComp.LastIndexOf( myStr, 'æ', iS ) );
      Console.WriteLine( "Ordinal       : {0}{1}", myStr.Substring( 0, iS + 1 ), myT1 );
      PrintMarker( "           AE : ", -1, myComp.LastIndexOf( myStr, "AE", iS, CompareOptions.Ordinal ) );
      PrintMarker( "           ae : ", -1, myComp.LastIndexOf( myStr, "ae", iS, CompareOptions.Ordinal ) );
      PrintMarker( "            Æ : ", -1, myComp.LastIndexOf( myStr, 'Æ', iS, CompareOptions.Ordinal ) );
      PrintMarker( "            æ : ", -1, myComp.LastIndexOf( myStr, 'æ', iS, CompareOptions.Ordinal ) );
      Console.WriteLine( "IgnoreCase    : {0}{1}", myStr.Substring( 0, iS + 1 ), myT1 );
      PrintMarker( "           AE : ", -1, myComp.LastIndexOf( myStr, "AE", iS, CompareOptions.IgnoreCase ) );
      PrintMarker( "           ae : ", -1, myComp.LastIndexOf( myStr, "ae", iS, CompareOptions.IgnoreCase ) );
      PrintMarker( "            Æ : ", -1, myComp.LastIndexOf( myStr, 'Æ', iS, CompareOptions.IgnoreCase ) );
      PrintMarker( "            æ : ", -1, myComp.LastIndexOf( myStr, 'æ', iS, CompareOptions.IgnoreCase ) );

      // Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
      myStr = "Is \u0055\u0308 or \u0075\u0308 the same as \u00DC or \u00FC?";
      Console.WriteLine();

      myT1 = new String( '-', iS );
      Console.WriteLine( "IndexOf( String, *, {0}, * )", iS );
      Console.WriteLine( "Original      : {0}", myStr );
      Console.WriteLine( "No options    : {0}{1}", myT1, myStr.Substring( iS ) );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", iS ), -1 );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", iS ), -1 );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', iS ), -1 );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', iS ), -1 );
      Console.WriteLine( "Ordinal       : {0}{1}", myT1, myStr.Substring( iS ) );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", iS, CompareOptions.Ordinal ), -1 );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", iS, CompareOptions.Ordinal ), -1 );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', iS, CompareOptions.Ordinal ), -1 );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', iS, CompareOptions.Ordinal ), -1 );
      Console.WriteLine( "IgnoreCase    : {0}{1}", myT1, myStr.Substring( iS ) );
      PrintMarker( "           U\u0308 : ", myComp.IndexOf( myStr, "U\u0308", iS, CompareOptions.IgnoreCase ), -1 );
      PrintMarker( "           u\u0308 : ", myComp.IndexOf( myStr, "u\u0308", iS, CompareOptions.IgnoreCase ), -1 );
      PrintMarker( "            Ü : ", myComp.IndexOf( myStr, 'Ü', iS, CompareOptions.IgnoreCase ), -1 );
      PrintMarker( "            ü : ", myComp.IndexOf( myStr, 'ü', iS, CompareOptions.IgnoreCase ), -1 );

      myT1 = new String( '-', myStr.Length - iS - 1 );
      Console.WriteLine( "LastIndexOf( String, *, {0}, * )", iS );
      Console.WriteLine( "Original      : {0}", myStr );
      Console.WriteLine( "No options    : {0}{1}", myStr.Substring( 0, iS + 1 ), myT1 );
      PrintMarker( "           U\u0308 : ", -1, myComp.LastIndexOf( myStr, "U\u0308", iS ) );
      PrintMarker( "           u\u0308 : ", -1, myComp.LastIndexOf( myStr, "u\u0308", iS ) );
      PrintMarker( "            Ü : ", -1, myComp.LastIndexOf( myStr, 'Ü', iS ) );
      PrintMarker( "            ü : ", -1, myComp.LastIndexOf( myStr, 'ü', iS ) );
      Console.WriteLine( "Ordinal       : {0}{1}", myStr.Substring( 0, iS + 1 ), myT1 );
      PrintMarker( "           U\u0308 : ", -1, myComp.LastIndexOf( myStr, "U\u0308", iS, CompareOptions.Ordinal ) );
      PrintMarker( "           u\u0308 : ", -1, myComp.LastIndexOf( myStr, "u\u0308", iS, CompareOptions.Ordinal ) );
      PrintMarker( "            Ü : ", -1, myComp.LastIndexOf( myStr, 'Ü', iS, CompareOptions.Ordinal ) );
      PrintMarker( "            ü : ", -1, myComp.LastIndexOf( myStr, 'ü', iS, CompareOptions.Ordinal ) );
      Console.WriteLine( "IgnoreCase    : {0}{1}", myStr.Substring( 0, iS + 1 ), myT1 );
      PrintMarker( "           U\u0308 : ", -1, myComp.LastIndexOf( myStr, "U\u0308", iS, CompareOptions.IgnoreCase ) );
      PrintMarker( "           u\u0308 : ", -1, myComp.LastIndexOf( myStr, "u\u0308", iS, CompareOptions.IgnoreCase ) );
      PrintMarker( "            Ü : ", -1, myComp.LastIndexOf( myStr, 'Ü', iS, CompareOptions.IgnoreCase ) );
      PrintMarker( "            ü : ", -1, myComp.LastIndexOf( myStr, 'ü', iS, CompareOptions.IgnoreCase ) );

   }

   public static void PrintMarker( String Prefix, int First, int Last )  {

      // Determines the size of the array to create.
      int mySize;
      if ( Last > First )
         mySize = Last;
      else
         mySize = First;

      if ( mySize > -1 )  {

         // Creates an array of Char to hold the markers.
         Char[] myCharArr = new Char[mySize+1];

         // Inserts the appropriate markers.
         if ( First > -1 )
         myCharArr[First] = 'f';
         if ( Last > -1 )
            myCharArr[Last] = 'l';
         if ( First == Last )
         myCharArr[First] = 'b';

         // Displays the array of Char as a String.
         Console.WriteLine( "{0}{1}", Prefix, new String( myCharArr ) );

      }
      else
         Console.WriteLine( Prefix );

   }

}


/*
This code produces the following output.

IndexOf( String, *, 20, * )
Original      : Is AE or ae the same as Æ or æ?
No options    : -------------------- as Æ or æ?
           AE :                         f
           ae :                              f
            Æ :                         f
            æ :                              f
Ordinal       : -------------------- as Æ or æ?
           AE :
           ae :
            Æ :                         f
            æ :                              f
IgnoreCase    : -------------------- as Æ or æ?
           AE :                         f
           ae :                         f
            Æ :                         f
            æ :                         f
LastIndexOf( String, *, 20, * )
Original      : Is AE or ae the same as Æ or æ?
No options    : Is AE or ae the same ----------
           AE :    l
           ae :          l
            Æ :    l
            æ :          l
Ordinal       : Is AE or ae the same ----------
           AE :    l
           ae :          l
            Æ :
            æ :
IgnoreCase    : Is AE or ae the same ----------
           AE :          l
           ae :          l
            Æ :          l
            æ :          l

IndexOf( String, *, 20, * )
Original      : Is U" or u" the same as Ü or ü?
No options    : -------------------- as Ü or ü?
           U" :                         f
           u" :                              f
            Ü :                         f
            ü :                              f
Ordinal       : -------------------- as Ü or ü?
           U" :
           u" :
            Ü :                         f
            ü :                              f
IgnoreCase    : -------------------- as Ü or ü?
           U" :                         f
           u" :                         f
            Ü :                         f
            ü :                         f
LastIndexOf( String, *, 20, * )
Original      : Is U" or u" the same as Ü or ü?
No options    : Is U" or u" the same ----------
           U" :    l
           u" :          l
            Ü :    l
            ü :          l
Ordinal       : Is U" or u" the same ----------
           U" :    l
           u" :          l
            Ü :
            ü :
IgnoreCase    : Is U" or u" the same ----------
           U" :          l
           u" :          l
            Ü :          l
            ü :          l

*/
Imports System
Imports System.Globalization
Imports Microsoft.VisualBasic

Public Class SamplesCompareInfo

   Public Shared Sub Main()

      ' Creates CompareInfo for the InvariantCulture.
      Dim myComp As CompareInfo = CultureInfo.InvariantCulture.CompareInfo

      ' iS is the starting index of the substring.
      Dim [iS] As Integer = 20
      ' myT1 is the string used for padding.
      Dim myT1 As [String]

      ' Searches for the ligature Æ.
      Dim myStr As [String] = "Is AE or ae the same as Æ or æ?"
      Console.WriteLine()

      myT1 = New [String]("-"c, [iS])
      Console.WriteLine("IndexOf( String, *, {0}, * )", [iS])
      Console.WriteLine("Original      : {0}", myStr)
      Console.WriteLine("No options    : {0}{1}", myT1, myStr.Substring([iS]))
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", [iS]), - 1)
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", [iS]), - 1)
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, [iS]), - 1)
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, [iS]), - 1)
      Console.WriteLine("Ordinal       : {0}{1}", myT1, myStr.Substring([iS]))
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", [iS], CompareOptions.Ordinal), - 1)
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", [iS], CompareOptions.Ordinal), - 1)
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, [iS], CompareOptions.Ordinal), - 1)
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, [iS], CompareOptions.Ordinal), - 1)
      Console.WriteLine("IgnoreCase    : {0}{1}", myT1, myStr.Substring([iS]))
      PrintMarker("           AE : ", myComp.IndexOf(myStr, "AE", [iS], CompareOptions.IgnoreCase), - 1)
      PrintMarker("           ae : ", myComp.IndexOf(myStr, "ae", [iS], CompareOptions.IgnoreCase), - 1)
      PrintMarker("            Æ : ", myComp.IndexOf(myStr, "Æ"c, [iS], CompareOptions.IgnoreCase), - 1)
      PrintMarker("            æ : ", myComp.IndexOf(myStr, "æ"c, [iS], CompareOptions.IgnoreCase), - 1)

      myT1 = New [String]("-"c, myStr.Length - [iS] - 1)
      Console.WriteLine("LastIndexOf( String, *, {0}, * )", [iS])
      Console.WriteLine("Original      : {0}", myStr)
      Console.WriteLine("No options    : {0}{1}", myStr.Substring(0, [iS] + 1), myT1)
      PrintMarker("           AE : ", - 1, myComp.LastIndexOf(myStr, "AE", [iS]))
      PrintMarker("           ae : ", - 1, myComp.LastIndexOf(myStr, "ae", [iS]))
      PrintMarker("            Æ : ", - 1, myComp.LastIndexOf(myStr, "Æ"c, [iS]))
      PrintMarker("            æ : ", - 1, myComp.LastIndexOf(myStr, "æ"c, [iS]))
      Console.WriteLine("Ordinal       : {0}{1}", myStr.Substring(0, [iS] + 1), myT1)
      PrintMarker("           AE : ", - 1, myComp.LastIndexOf(myStr, "AE", [iS], CompareOptions.Ordinal))
      PrintMarker("           ae : ", - 1, myComp.LastIndexOf(myStr, "ae", [iS], CompareOptions.Ordinal))
      PrintMarker("            Æ : ", - 1, myComp.LastIndexOf(myStr, "Æ"c, [iS], CompareOptions.Ordinal))
      PrintMarker("            æ : ", - 1, myComp.LastIndexOf(myStr, "æ"c, [iS], CompareOptions.Ordinal))
      Console.WriteLine("IgnoreCase    : {0}{1}", myStr.Substring(0, [iS] + 1), myT1)
      PrintMarker("           AE : ", - 1, myComp.LastIndexOf(myStr, "AE", [iS], CompareOptions.IgnoreCase))
      PrintMarker("           ae : ", - 1, myComp.LastIndexOf(myStr, "ae", [iS], CompareOptions.IgnoreCase))
      PrintMarker("            Æ : ", - 1, myComp.LastIndexOf(myStr, "Æ"c, [iS], CompareOptions.IgnoreCase))
      PrintMarker("            æ : ", - 1, myComp.LastIndexOf(myStr, "æ"c, [iS], CompareOptions.IgnoreCase))

      ' Searches for the combining character sequence Latin capital letter U with diaeresis or Latin small letter u with diaeresis.
      myStr = "Is " & ChrW(&H0055) & ChrW(&H0308) & " or " & ChrW(&H0075) & ChrW(&H0308) & " the same as " & ChrW(&H00DC) & " or " & ChrW(&H00FC) & "?"
      Console.WriteLine()

      myT1 = New [String]("-"c, [iS])
      Console.WriteLine("IndexOf( String, *, {0}, * )", [iS])
      Console.WriteLine("Original      : {0}", myStr)
      Console.WriteLine("No options    : {0}{1}", myT1, myStr.Substring([iS]))
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), [iS]), - 1)
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), [iS]), - 1)
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, [iS]), - 1)
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, [iS]), - 1)
      Console.WriteLine("Ordinal       : {0}{1}", myT1, myStr.Substring([iS]))
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), [iS], CompareOptions.Ordinal), - 1)
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), [iS], CompareOptions.Ordinal), - 1)
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, [iS], CompareOptions.Ordinal), - 1)
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, [iS], CompareOptions.Ordinal), - 1)
      Console.WriteLine("IgnoreCase    : {0}{1}", myT1, myStr.Substring([iS]))
      PrintMarker("           U" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H0308), [iS], CompareOptions.IgnoreCase), - 1)
      PrintMarker("           u" & ChrW(&H0308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H0308), [iS], CompareOptions.IgnoreCase), - 1)
      PrintMarker("            Ü : ", myComp.IndexOf(myStr, "Ü"c, [iS], CompareOptions.IgnoreCase), - 1)
      PrintMarker("            ü : ", myComp.IndexOf(myStr, "ü"c, [iS], CompareOptions.IgnoreCase), - 1)

      myT1 = New [String]("-"c, myStr.Length - [iS] - 1)
      Console.WriteLine("LastIndexOf( String, *, {0}, * )", [iS])
      Console.WriteLine("Original      : {0}", myStr)
      Console.WriteLine("No options    : {0}{1}", myStr.Substring(0, [iS] + 1), myT1)
      PrintMarker("           U" & ChrW(&H0308) & " : ", - 1, myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), [iS]))
      PrintMarker("           u" & ChrW(&H0308) & " : ", - 1, myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), [iS]))
      PrintMarker("            Ü : ", - 1, myComp.LastIndexOf(myStr, "Ü"c, [iS]))
      PrintMarker("            ü : ", - 1, myComp.LastIndexOf(myStr, "ü"c, [iS]))
      Console.WriteLine("Ordinal       : {0}{1}", myStr.Substring(0, [iS] + 1), myT1)
      PrintMarker("           U" & ChrW(&H0308) & " : ", - 1, myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), [iS], CompareOptions.Ordinal))
      PrintMarker("           u" & ChrW(&H0308) & " : ", - 1, myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), [iS], CompareOptions.Ordinal))
      PrintMarker("            Ü : ", - 1, myComp.LastIndexOf(myStr, "Ü"c, [iS], CompareOptions.Ordinal))
      PrintMarker("            ü : ", - 1, myComp.LastIndexOf(myStr, "ü"c, [iS], CompareOptions.Ordinal))
      Console.WriteLine("IgnoreCase    : {0}{1}", myStr.Substring(0, [iS] + 1), myT1)
      PrintMarker("           U" & ChrW(&H0308) & " : ", - 1, myComp.LastIndexOf(myStr, "U" & ChrW(&H0308), [iS], CompareOptions.IgnoreCase))
      PrintMarker("           u" & ChrW(&H0308) & " : ", - 1, myComp.LastIndexOf(myStr, "u" & ChrW(&H0308), [iS], CompareOptions.IgnoreCase))
      PrintMarker("            Ü : ", - 1, myComp.LastIndexOf(myStr, "Ü"c, [iS], CompareOptions.IgnoreCase))
      PrintMarker("            ü : ", - 1, myComp.LastIndexOf(myStr, "ü"c, [iS], CompareOptions.IgnoreCase))

   End Sub 'Main

   Public Shared Sub PrintMarker(Prefix As [String], First As Integer, Last As Integer)

      ' Determines the size of the array to create.
      Dim mySize As Integer
      If Last > First Then
         mySize = Last
      Else
         mySize = First
      End If 

      If mySize > - 1 Then

         ' Creates an array of Char to hold the markers.
         Dim myCharArr(mySize + 1) As [Char]

         ' Inserts the appropriate markers.
         If First > - 1 Then
            myCharArr(First) = "f"c
         End If
         If Last > - 1 Then
            myCharArr(Last) = "l"c
         End If
         If First = Last Then
            myCharArr(First) = "b"c
         End If 

         ' Displays the array of Char as a String.
         Console.WriteLine("{0}{1}", Prefix, New [String](myCharArr))
      
      Else
         Console.WriteLine(Prefix)

      End If 

   End Sub 'PrintMarker

End Class 'SamplesCompareInfo 


'This code produces the following output.
'
'IndexOf( String, *, 20, * )
'Original      : Is AE or ae the same as Æ or æ?
'No options    : -------------------- as Æ or æ?
'           AE :                         f
'           ae :                              f
'            Æ :                         f
'            æ :                              f
'Ordinal       : -------------------- as Æ or æ?
'           AE :
'           ae :
'            Æ :                         f
'            æ :                              f
'IgnoreCase    : -------------------- as Æ or æ?
'           AE :                         f
'           ae :                         f
'            Æ :                         f
'            æ :                         f
'LastIndexOf( String, *, 20, * )
'Original      : Is AE or ae the same as Æ or æ?
'No options    : Is AE or ae the same ----------
'           AE :    l
'           ae :          l
'            Æ :    l
'            æ :          l
'Ordinal       : Is AE or ae the same ----------
'           AE :    l
'           ae :          l
'            Æ :
'            æ :
'IgnoreCase    : Is AE or ae the same ----------
'           AE :          l
'           ae :          l
'            Æ :          l
'            æ :          l
'
'IndexOf( String, *, 20, * )
'Original      : Is U" or u" the same as Ü or ü?
'No options    : -------------------- as Ü or ü?
'           U" :                         f
'           u" :                              f
'            Ü :                         f
'            ü :                              f
'Ordinal       : -------------------- as Ü or ü?
'           U" :
'           u" :
'            Ü :                         f
'            ü :                              f
'IgnoreCase    : -------------------- as Ü or ü?
'           U" :                         f
'           u" :                         f
'            Ü :                         f
'            ü :                         f
'LastIndexOf( String, *, 20, * )
'Original      : Is U" or u" the same as Ü or ü?
'No options    : Is U" or u" the same ----------
'           U" :    l
'           u" :          l
'            Ü :    l
'            ü :          l
'Ordinal       : Is U" or u" the same ----------
'           U" :    l
'           u" :          l
'            Ü :
'            ü :
'IgnoreCase    : Is U" or u" the same ----------
'           U" :          l
'           u" :          l
'            Ü :          l
'            ü :          l

Commenti

La stringa di origine viene cercata all' startIndex indietro a partire da e termina all'inizio della stringa.The source string is searched backward starting at startIndex and ending at the beginning of the string.

Questo overload esegue una ricerca con distinzione delle impostazioni cultura.This overload performs a culture-sensitive search. Un valore Unicode che rappresenta un carattere precomposto, ad esempio la legatura "Æ" (U + 00C6), può essere considerato equivalente a qualsiasi occorrenza dei componenti del carattere nella sequenza corretta, ad esempio "AE" (U + 0041, U + 0045), a seconda delle impostazioni cultura.A Unicode value representing a precomposed character, such as the ligature "Æ" (U+00C6), might be considered equivalent to any occurrence of the character's components in the correct sequence, such as "AE" (U+0041, U+0045), depending on the culture. Per eseguire una ricerca ordinale (indipendente dalle impostazioni cultura), in cui vengono confrontati i valori Unicode, è necessario chiamare uno degli overload con un parametro di tipo CompareOptions e usare il CompareOptions.Ordinal valore.To perform an ordinal (culture-insensitive) search, where the Unicode values are compared, you should call one of the overloads that has a parameter of type CompareOptions and use the CompareOptions.Ordinal value.

Nota

Quando possibile, è necessario chiamare i metodi di confronto tra stringhe con un parametro CompareOptions di tipo per specificare il tipo di confronto previsto.When possible, you should call string comparison methods that have a parameter of type CompareOptions to specify the kind of comparison expected. Come regola generale, usare le opzioni linguistiche (usando le impostazioni cultura correnti) per confrontare le stringhe visualizzate nell'interfaccia utente CompareOptions.Ordinal e CompareOptions.OrdinalIgnoreCase specificare o per i confronti di sicurezza.As a general rule, use linguistic options (using the current culture) for comparing strings displayed in the user interface and specify CompareOptions.Ordinal or CompareOptions.OrdinalIgnoreCase for security comparisons.

Note per i chiamanti

I set di caratteri includono caratteri ignorabili, ovvero caratteri che non vengono considerati quando si esegue un ordinamento linguistico o con distinzione delle impostazioni cultura.Character sets include ignorable characters, which are characters that are not considered when performing a linguistic or culture-sensitive sort. In una ricerca dipendente dalle impostazioni cultura, se value contiene un carattere ignorabile, il risultato è equivalente alla ricerca con il carattere rimosso.In a culture-sensitive search, if value contains an ignorable character, the result is equivalent to searching with that character removed. Se value è costituito solo da uno o più caratteri ignorabili LastIndexOf(String, String, Int32) , il metodo startIndexrestituisce sempre, ovvero la posizione del carattere in corrispondenza della quale ha inizio la ricerca.If value consists only of one or more ignorable characters, the LastIndexOf(String, String, Int32) method always returns startIndex, which is the character position at which the search begins. Nell'esempio seguente viene usato il LastIndexOf(String, String, Int32) metodo per trovare una sottostringa che include un trattino (U + 00AD) e che precede o include la "m" finale in una stringa.In the following example, the LastIndexOf(String, String, Int32) method is used to find a substring that includes a soft hyphen (U+00AD) and that precedes or includes the final "m" in a string. Poiché il segno meno flessibile nella stringa di ricerca viene ignorato, chiamando il metodo per trovare una sottostringa costituita dal trattino morbido e "m" viene restituita la posizione della "m" nella stringa, mentre la chiamata per trovare una sottostringa costituita dal trattino morbido e "n" restituisce il posizione di "n".Because the soft hyphen in the search string is ignored, calling the method to find a substring that consists of the soft hyphen and "m" returns the position of the "m" in the string, whereas calling it to find a substring that consists of the soft hyphen and "n" returns the position of the "n". Quando la stringa di ricerca contiene solo il trattino morbido, il metodo restituisce l'indice di "m", che rappresenta il valore startIndexdi.When the search string contains only the soft hyphen, the method returns the index of the "m", which represents the value of startIndex.

[!code-csharpSystem.Globalization.CompareInfo.LastIndexOf#7] [!code-vbSystem.Globalization.CompareInfo.LastIndexOf#7][!code-csharpSystem.Globalization.CompareInfo.LastIndexOf#7] [!code-vbSystem.Globalization.CompareInfo.LastIndexOf#7]

Vedi anche

Si applica a