CompareInfo.LastIndexOf Method (String, Char, Int32, CompareOptions)

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.

Namespace:  System.Globalization
Assembly:  mscorlib (in mscorlib.dll)

Syntax

'Declaration
Public Overridable Function LastIndexOf ( _
    source As String, _
    value As Char, _
    startIndex As Integer, _
    options As CompareOptions _
) As Integer
public virtual int LastIndexOf(
    string source,
    char value,
    int startIndex,
    CompareOptions options
)

Parameters

  • value
    Type: System.Char
    The character to locate within source.
  • startIndex
    Type: System.Int32
    The zero-based starting index of the backward search.

Return Value

Type: System.Int32
The zero-based index of the last occurrence of value within the section of source that extends from the beginning of source to startIndex using the specified CompareOptions value, if found; otherwise, -1.

Exceptions

Exception Condition
ArgumentNullException

source is nulla null reference (Nothing in Visual Basic).

ArgumentOutOfRangeException

startIndex is outside the range of valid indexes for source.

ArgumentException

options contains an invalid CompareOptions value.

Remarks

The source string is searched backward starting at startIndex and ending at the beginning of the string.

The CompareOptions.StringSort value is not valid for this method.

If options does not include the Ordinal value, this overload performs a culture-sensitive search. 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. If options includes the Ordinal value, this overload performs an ordinal (culture-insensitive) search. A character is considered equivalent to another character only if the Unicode values are the same.

Examples

The following example determines the indexes of the first and last occurrences of a character or a substring within a portion of a string. Note that IndexOf and LastIndexOf are searching in different portions of the string, even with the same startIndex parameter.

Imports System.Globalization

Public Class Example

   Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)

      ' 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?"
      outputBlock.Text &= vbCrLf

      myT1 = New [String]("-"c, [iS])
      outputBlock.Text += String.Format("IndexOf( String, *, {0}, * )", [iS]) & vbCrLf
      outputBlock.Text += String.Format("Original      : {0}", myStr) & vbCrLf
      outputBlock.Text += String.Format("No options    : {0}{1}", myT1, myStr.Substring([iS])) & vbCrLf
      PrintMarker(outputBlock, "           AE : ", myComp.IndexOf(myStr, "AE", [iS], CompareOptions.None), -1)
      PrintMarker(outputBlock, "           ae : ", myComp.IndexOf(myStr, "ae", [iS], CompareOptions.None), -1)
      PrintMarker(outputBlock, "            Æ : ", myComp.IndexOf(myStr, "Æ"c, [iS], CompareOptions.None), -1)
      PrintMarker(outputBlock, "            æ : ", myComp.IndexOf(myStr, "æ"c, [iS], CompareOptions.None), -1)
      outputBlock.Text += String.Format("Ordinal       : {0}{1}", myT1, myStr.Substring([iS])) & vbCrLf
      PrintMarker(outputBlock, "           AE : ", myComp.IndexOf(myStr, "AE", [iS], CompareOptions.Ordinal), -1)
      PrintMarker(outputBlock, "           ae : ", myComp.IndexOf(myStr, "ae", [iS], CompareOptions.Ordinal), -1)
      PrintMarker(outputBlock, "            Æ : ", myComp.IndexOf(myStr, "Æ"c, [iS], CompareOptions.Ordinal), -1)
      PrintMarker(outputBlock, "            æ : ", myComp.IndexOf(myStr, "æ"c, [iS], CompareOptions.Ordinal), -1)
      outputBlock.Text += String.Format("IgnoreCase    : {0}{1}", myT1, myStr.Substring([iS])) & vbCrLf
      PrintMarker(outputBlock, "           AE : ", myComp.IndexOf(myStr, "AE", [iS], CompareOptions.IgnoreCase), -1)
      PrintMarker(outputBlock, "           ae : ", myComp.IndexOf(myStr, "ae", [iS], CompareOptions.IgnoreCase), -1)
      PrintMarker(outputBlock, "            Æ : ", myComp.IndexOf(myStr, "Æ"c, [iS], CompareOptions.IgnoreCase), -1)
      PrintMarker(outputBlock, "            æ : ", myComp.IndexOf(myStr, "æ"c, [iS], CompareOptions.IgnoreCase), -1)

      myT1 = New [String]("-"c, myStr.Length - [iS] - 1)
      outputBlock.Text += String.Format("LastIndexOf( String, *, {0}, * )", [iS]) & vbCrLf
      outputBlock.Text += String.Format("Original      : {0}", myStr) & vbCrLf
      outputBlock.Text += String.Format("No options    : {0}{1}", myStr.Substring(0, [iS] + 1), myT1) & vbCrLf
      PrintMarker(outputBlock, "           AE : ", -1, myComp.LastIndexOf(myStr, "AE", [iS], CompareOptions.None))
      PrintMarker(outputBlock, "           ae : ", -1, myComp.LastIndexOf(myStr, "ae", [iS], CompareOptions.None))
      PrintMarker(outputBlock, "            Æ : ", -1, myComp.LastIndexOf(myStr, "Æ"c, [iS], CompareOptions.None))
      PrintMarker(outputBlock, "            æ : ", -1, myComp.LastIndexOf(myStr, "æ"c, [iS], CompareOptions.None))
      outputBlock.Text += String.Format("Ordinal       : {0}{1}", myStr.Substring(0, [iS] + 1), myT1) & vbCrLf
      PrintMarker(outputBlock, "           AE : ", -1, myComp.LastIndexOf(myStr, "AE", [iS], CompareOptions.Ordinal))
      PrintMarker(outputBlock, "           ae : ", -1, myComp.LastIndexOf(myStr, "ae", [iS], CompareOptions.Ordinal))
      PrintMarker(outputBlock, "            Æ : ", -1, myComp.LastIndexOf(myStr, "Æ"c, [iS], CompareOptions.Ordinal))
      PrintMarker(outputBlock, "            æ : ", -1, myComp.LastIndexOf(myStr, "æ"c, [iS], CompareOptions.Ordinal))
      outputBlock.Text += String.Format("IgnoreCase    : {0}{1}", myStr.Substring(0, [iS] + 1), myT1) & vbCrLf
      PrintMarker(outputBlock, "           AE : ", -1, myComp.LastIndexOf(myStr, "AE", [iS], CompareOptions.IgnoreCase))
      PrintMarker(outputBlock, "           ae : ", -1, myComp.LastIndexOf(myStr, "ae", [iS], CompareOptions.IgnoreCase))
      PrintMarker(outputBlock, "            Æ : ", -1, myComp.LastIndexOf(myStr, "Æ"c, [iS], CompareOptions.IgnoreCase))
      PrintMarker(outputBlock, "            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(&H55) & ChrW(&H308) & " or " & ChrW(&H75) & ChrW(&H308) & " the same as " & ChrW(&HDC) & " or " & ChrW(&HFC) & "?"
      outputBlock.Text &= vbCrLf

      myT1 = New [String]("-"c, [iS])
      outputBlock.Text += String.Format("IndexOf( String, *, {0}, * )", [iS]) & vbCrLf
      outputBlock.Text += String.Format("Original      : {0}", myStr) & vbCrLf
      outputBlock.Text += String.Format("No options    : {0}{1}", myT1, myStr.Substring([iS])) & vbCrLf
      PrintMarker(outputBlock, "           U" & ChrW(&H308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H308), [iS], CompareOptions.None), -1)
      PrintMarker(outputBlock, "           u" & ChrW(&H308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H308), [iS], CompareOptions.None), -1)
      PrintMarker(outputBlock, "            Ü : ", myComp.IndexOf(myStr, "Ü"c, [iS], CompareOptions.None), -1)
      PrintMarker(outputBlock, "            ü : ", myComp.IndexOf(myStr, "ü"c, [iS], CompareOptions.None), -1)
      outputBlock.Text += String.Format("Ordinal       : {0}{1}", myT1, myStr.Substring([iS])) & vbCrLf
      PrintMarker(outputBlock, "           U" & ChrW(&H308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H308), [iS], CompareOptions.Ordinal), -1)
      PrintMarker(outputBlock, "           u" & ChrW(&H308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H308), [iS], CompareOptions.Ordinal), -1)
      PrintMarker(outputBlock, "            Ü : ", myComp.IndexOf(myStr, "Ü"c, [iS], CompareOptions.Ordinal), -1)
      PrintMarker(outputBlock, "            ü : ", myComp.IndexOf(myStr, "ü"c, [iS], CompareOptions.Ordinal), -1)
      outputBlock.Text += String.Format("IgnoreCase    : {0}{1}", myT1, myStr.Substring([iS])) & vbCrLf
      PrintMarker(outputBlock, "           U" & ChrW(&H308) & " : ", myComp.IndexOf(myStr, "U" & ChrW(&H308), [iS], CompareOptions.IgnoreCase), -1)
      PrintMarker(outputBlock, "           u" & ChrW(&H308) & " : ", myComp.IndexOf(myStr, "u" & ChrW(&H308), [iS], CompareOptions.IgnoreCase), -1)
      PrintMarker(outputBlock, "            Ü : ", myComp.IndexOf(myStr, "Ü"c, [iS], CompareOptions.IgnoreCase), -1)
      PrintMarker(outputBlock, "            ü : ", myComp.IndexOf(myStr, "ü"c, [iS], CompareOptions.IgnoreCase), -1)

      myT1 = New [String]("-"c, myStr.Length - [iS] - 1)
      outputBlock.Text += String.Format("LastIndexOf( String, *, {0}, * )", [iS]) & vbCrLf
      outputBlock.Text += String.Format("Original      : {0}", myStr) & vbCrLf
      outputBlock.Text += String.Format("No options    : {0}{1}", myStr.Substring(0, [iS] + 1), myT1) & vbCrLf
      PrintMarker(outputBlock, "           U" & ChrW(&H308) & " : ", -1, myComp.LastIndexOf(myStr, "U" & ChrW(&H308), [iS], CompareOptions.None))
      PrintMarker(outputBlock, "           u" & ChrW(&H308) & " : ", -1, myComp.LastIndexOf(myStr, "u" & ChrW(&H308), [iS], CompareOptions.None))
      PrintMarker(outputBlock, "            Ü : ", -1, myComp.LastIndexOf(myStr, "Ü"c, [iS], CompareOptions.None))
      PrintMarker(outputBlock, "            ü : ", -1, myComp.LastIndexOf(myStr, "ü"c, [iS], CompareOptions.None))
      outputBlock.Text += String.Format("Ordinal       : {0}{1}", myStr.Substring(0, [iS] + 1), myT1) & vbCrLf
      PrintMarker(outputBlock, "           U" & ChrW(&H308) & " : ", -1, myComp.LastIndexOf(myStr, "U" & ChrW(&H308), [iS], CompareOptions.Ordinal))
      PrintMarker(outputBlock, "           u" & ChrW(&H308) & " : ", -1, myComp.LastIndexOf(myStr, "u" & ChrW(&H308), [iS], CompareOptions.Ordinal))
      PrintMarker(outputBlock, "            Ü : ", -1, myComp.LastIndexOf(myStr, "Ü"c, [iS], CompareOptions.Ordinal))
      PrintMarker(outputBlock, "            ü : ", -1, myComp.LastIndexOf(myStr, "ü"c, [iS], CompareOptions.Ordinal))
      outputBlock.Text += String.Format("IgnoreCase    : {0}{1}", myStr.Substring(0, [iS] + 1), myT1) & vbCrLf
      PrintMarker(outputBlock, "           U" & ChrW(&H308) & " : ", -1, myComp.LastIndexOf(myStr, "U" & ChrW(&H308), [iS], CompareOptions.IgnoreCase))
      PrintMarker(outputBlock, "           u" & ChrW(&H308) & " : ", -1, myComp.LastIndexOf(myStr, "u" & ChrW(&H308), [iS], CompareOptions.IgnoreCase))
      PrintMarker(outputBlock, "            Ü : ", -1, myComp.LastIndexOf(myStr, "Ü"c, [iS], CompareOptions.IgnoreCase))
      PrintMarker(outputBlock, "            ü : ", -1, myComp.LastIndexOf(myStr, "ü"c, [iS], CompareOptions.IgnoreCase))

   End Sub 'Main

   Public Shared Sub PrintMarker(ByVal outputBlock As System.Windows.Controls.TextBlock, ByVal Prefix As [String], ByVal First As Integer, ByVal 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.
         outputBlock.Text += String.Format("{0}{1}", Prefix, New [String](myCharArr)) & vbCrLf

      Else
         outputBlock.Text &= Prefix & vbCrLf

      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

using System;
using System.Globalization;

public class Example
{

   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {

      // 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?";
      outputBlock.Text += "\n";

      myT1 = new String('-', iS);
      outputBlock.Text += String.Format("IndexOf( String, *, {0}, * )", iS) + "\n";
      outputBlock.Text += String.Format("Original      : {0}", myStr) + "\n";
      outputBlock.Text += String.Format("No options    : {0}{1}", myT1, myStr.Substring(iS)) + "\n";
      PrintMarker(outputBlock, "           AE : ", myComp.IndexOf(myStr, "AE", iS, CompareOptions.None), -1);
      PrintMarker(outputBlock, "           ae : ", myComp.IndexOf(myStr, "ae", iS, CompareOptions.None), -1);
      PrintMarker(outputBlock, "            Æ : ", myComp.IndexOf(myStr, 'Æ', iS, CompareOptions.None), -1);
      PrintMarker(outputBlock, "            æ : ", myComp.IndexOf(myStr, 'æ', iS, CompareOptions.None), -1);
      outputBlock.Text += String.Format("Ordinal       : {0}{1}", myT1, myStr.Substring(iS)) + "\n";
      PrintMarker(outputBlock, "           AE : ", myComp.IndexOf(myStr, "AE", iS, CompareOptions.Ordinal), -1);
      PrintMarker(outputBlock, "           ae : ", myComp.IndexOf(myStr, "ae", iS, CompareOptions.Ordinal), -1);
      PrintMarker(outputBlock, "            Æ : ", myComp.IndexOf(myStr, 'Æ', iS, CompareOptions.Ordinal), -1);
      PrintMarker(outputBlock, "            æ : ", myComp.IndexOf(myStr, 'æ', iS, CompareOptions.Ordinal), -1);
      outputBlock.Text += String.Format("IgnoreCase    : {0}{1}", myT1, myStr.Substring(iS)) + "\n";
      PrintMarker(outputBlock, "           AE : ", myComp.IndexOf(myStr, "AE", iS, CompareOptions.IgnoreCase), -1);
      PrintMarker(outputBlock, "           ae : ", myComp.IndexOf(myStr, "ae", iS, CompareOptions.IgnoreCase), -1);
      PrintMarker(outputBlock, "            Æ : ", myComp.IndexOf(myStr, 'Æ', iS, CompareOptions.IgnoreCase), -1);
      PrintMarker(outputBlock, "            æ : ", myComp.IndexOf(myStr, 'æ', iS, CompareOptions.IgnoreCase), -1);

      myT1 = new String('-', myStr.Length - iS - 1);
      outputBlock.Text += String.Format("LastIndexOf( String, *, {0}, * )", iS) + "\n";
      outputBlock.Text += String.Format("Original      : {0}", myStr) + "\n";
      outputBlock.Text += String.Format("No options    : {0}{1}", myStr.Substring(0, iS + 1), myT1) + "\n";
      PrintMarker(outputBlock, "           AE : ", -1, myComp.LastIndexOf(myStr, "AE", iS, CompareOptions.None));
      PrintMarker(outputBlock, "           ae : ", -1, myComp.LastIndexOf(myStr, "ae", iS, CompareOptions.None));
      PrintMarker(outputBlock, "            Æ : ", -1, myComp.LastIndexOf(myStr, 'Æ', iS, CompareOptions.None));
      PrintMarker(outputBlock, "            æ : ", -1, myComp.LastIndexOf(myStr, 'æ', iS, CompareOptions.None));
      outputBlock.Text += String.Format("Ordinal       : {0}{1}", myStr.Substring(0, iS + 1), myT1) + "\n";
      PrintMarker(outputBlock, "           AE : ", -1, myComp.LastIndexOf(myStr, "AE", iS, CompareOptions.Ordinal));
      PrintMarker(outputBlock, "           ae : ", -1, myComp.LastIndexOf(myStr, "ae", iS, CompareOptions.Ordinal));
      PrintMarker(outputBlock, "            Æ : ", -1, myComp.LastIndexOf(myStr, 'Æ', iS, CompareOptions.Ordinal));
      PrintMarker(outputBlock, "            æ : ", -1, myComp.LastIndexOf(myStr, 'æ', iS, CompareOptions.Ordinal));
      outputBlock.Text += String.Format("IgnoreCase    : {0}{1}", myStr.Substring(0, iS + 1), myT1) + "\n";
      PrintMarker(outputBlock, "           AE : ", -1, myComp.LastIndexOf(myStr, "AE", iS, CompareOptions.IgnoreCase));
      PrintMarker(outputBlock, "           ae : ", -1, myComp.LastIndexOf(myStr, "ae", iS, CompareOptions.IgnoreCase));
      PrintMarker(outputBlock, "            Æ : ", -1, myComp.LastIndexOf(myStr, 'Æ', iS, CompareOptions.IgnoreCase));
      PrintMarker(outputBlock, "            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?";
      outputBlock.Text += "\n";

      myT1 = new String('-', iS);
      outputBlock.Text += String.Format("IndexOf( String, *, {0}, * )", iS) + "\n";
      outputBlock.Text += String.Format("Original      : {0}", myStr) + "\n";
      outputBlock.Text += String.Format("No options    : {0}{1}", myT1, myStr.Substring(iS)) + "\n";
      PrintMarker(outputBlock, "           U\u0308 : ", myComp.IndexOf(myStr, "U\u0308", iS, CompareOptions.None), -1);
      PrintMarker(outputBlock, "           u\u0308 : ", myComp.IndexOf(myStr, "u\u0308", iS, CompareOptions.None), -1);
      PrintMarker(outputBlock, "            Ü : ", myComp.IndexOf(myStr, 'Ü', iS, CompareOptions.None), -1);
      PrintMarker(outputBlock, "            ü : ", myComp.IndexOf(myStr, 'ü', iS, CompareOptions.None), -1);
      outputBlock.Text += String.Format("Ordinal       : {0}{1}", myT1, myStr.Substring(iS)) + "\n";
      PrintMarker(outputBlock, "           U\u0308 : ", myComp.IndexOf(myStr, "U\u0308", iS, CompareOptions.Ordinal), -1);
      PrintMarker(outputBlock, "           u\u0308 : ", myComp.IndexOf(myStr, "u\u0308", iS, CompareOptions.Ordinal), -1);
      PrintMarker(outputBlock, "            Ü : ", myComp.IndexOf(myStr, 'Ü', iS, CompareOptions.Ordinal), -1);
      PrintMarker(outputBlock, "            ü : ", myComp.IndexOf(myStr, 'ü', iS, CompareOptions.Ordinal), -1);
      outputBlock.Text += String.Format("IgnoreCase    : {0}{1}", myT1, myStr.Substring(iS)) + "\n";
      PrintMarker(outputBlock, "           U\u0308 : ", myComp.IndexOf(myStr, "U\u0308", iS, CompareOptions.IgnoreCase), -1);
      PrintMarker(outputBlock, "           u\u0308 : ", myComp.IndexOf(myStr, "u\u0308", iS, CompareOptions.IgnoreCase), -1);
      PrintMarker(outputBlock, "            Ü : ", myComp.IndexOf(myStr, 'Ü', iS, CompareOptions.IgnoreCase), -1);
      PrintMarker(outputBlock, "            ü : ", myComp.IndexOf(myStr, 'ü', iS, CompareOptions.IgnoreCase), -1);

      myT1 = new String('-', myStr.Length - iS - 1);
      outputBlock.Text += String.Format("LastIndexOf( String, *, {0}, * )", iS) + "\n";
      outputBlock.Text += String.Format("Original      : {0}", myStr) + "\n";
      outputBlock.Text += String.Format("No options    : {0}{1}", myStr.Substring(0, iS + 1), myT1) + "\n";
      PrintMarker(outputBlock, "           U\u0308 : ", -1, myComp.LastIndexOf(myStr, "U\u0308", iS, CompareOptions.None));
      PrintMarker(outputBlock, "           u\u0308 : ", -1, myComp.LastIndexOf(myStr, "u\u0308", iS, CompareOptions.None));
      PrintMarker(outputBlock, "            Ü : ", -1, myComp.LastIndexOf(myStr, 'Ü', iS, CompareOptions.None));
      PrintMarker(outputBlock, "            ü : ", -1, myComp.LastIndexOf(myStr, 'ü', iS, CompareOptions.None));
      outputBlock.Text += String.Format("Ordinal       : {0}{1}", myStr.Substring(0, iS + 1), myT1) + "\n";
      PrintMarker(outputBlock, "           U\u0308 : ", -1, myComp.LastIndexOf(myStr, "U\u0308", iS, CompareOptions.Ordinal));
      PrintMarker(outputBlock, "           u\u0308 : ", -1, myComp.LastIndexOf(myStr, "u\u0308", iS, CompareOptions.Ordinal));
      PrintMarker(outputBlock, "            Ü : ", -1, myComp.LastIndexOf(myStr, 'Ü', iS, CompareOptions.Ordinal));
      PrintMarker(outputBlock, "            ü : ", -1, myComp.LastIndexOf(myStr, 'ü', iS, CompareOptions.Ordinal));
      outputBlock.Text += String.Format("IgnoreCase    : {0}{1}", myStr.Substring(0, iS + 1), myT1) + "\n";
      PrintMarker(outputBlock, "           U\u0308 : ", -1, myComp.LastIndexOf(myStr, "U\u0308", iS, CompareOptions.IgnoreCase));
      PrintMarker(outputBlock, "           u\u0308 : ", -1, myComp.LastIndexOf(myStr, "u\u0308", iS, CompareOptions.IgnoreCase));
      PrintMarker(outputBlock, "            Ü : ", -1, myComp.LastIndexOf(myStr, 'Ü', iS, CompareOptions.IgnoreCase));
      PrintMarker(outputBlock, "            ü : ", -1, myComp.LastIndexOf(myStr, 'ü', iS, CompareOptions.IgnoreCase));

   }

   public static void PrintMarker(System.Windows.Controls.TextBlock outputBlock, 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.
         outputBlock.Text += String.Format("{0}{1}", Prefix, new String(myCharArr)) + "\n";

      }
      else
         outputBlock.Text += Prefix + "\n";

   }

}


/*
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

*/

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.