String.IndexOf Yöntem

Tanım

Bu örnek içinde belirtilen bir Unicode karakterinin veya dizesinin ilk oluşumunun sıfır tabanlı dizinini bildirir.Reports the zero-based index of the first occurrence of a specified Unicode character or string within this instance. Bu örnekte karakter veya dize bulunmadığında, yöntem -1 döndürür.The method returns -1 if the character or string is not found in this instance.

Aşırı Yüklemeler

IndexOf(String, Int32, Int32)

Bu örnekteki belirtilen dizenin ilk oluşumunun sıfır tabanlı dizinini bildirir.Reports the zero-based index of the first occurrence of the specified string in this instance. Arama belirtilen bir karakter konumunda başlar ve belirtilen sayıda karakter konumunu inceler.The search starts at a specified character position and examines a specified number of character positions.

IndexOf(String, Int32, Int32, StringComparison)

Geçerli nesnede belirtilen dizenin ilk oluşumunun sıfır tabanlı dizinini bildirir String .Reports the zero-based index of the first occurrence of the specified string in the current String object. Parametreler geçerli dizedeki başlangıç arama konumunu, aranacak geçerli dizedeki karakter sayısını ve belirtilen dize için kullanılacak arama türünü belirtir.Parameters specify the starting search position in the current string, the number of characters in the current string to search, and the type of search to use for the specified string.

IndexOf(String, Int32, StringComparison)

Geçerli nesnede belirtilen dizenin ilk oluşumunun sıfır tabanlı dizinini bildirir String .Reports the zero-based index of the first occurrence of the specified string in the current String object. Parametreler geçerli dizedeki başlangıç arama konumunu ve belirtilen dize için kullanılacak arama türünü belirtir.Parameters specify the starting search position in the current string and the type of search to use for the specified string.

IndexOf(Char, Int32, Int32)

Bu örnekte belirtilen karakterin ilk oluşumunun sıfır tabanlı dizinini bildirir.Reports the zero-based index of the first occurrence of the specified character in this instance. Arama belirtilen bir karakter konumunda başlar ve belirtilen sayıda karakter konumunu inceler.The search starts at a specified character position and examines a specified number of character positions.

IndexOf(String, StringComparison)

Geçerli nesnede belirtilen dizenin ilk oluşumunun sıfır tabanlı dizinini bildirir String .Reports the zero-based index of the first occurrence of the specified string in the current String object. Bir parametre, belirtilen dize için kullanılacak arama türünü belirtir.A parameter specifies the type of search to use for the specified string.

IndexOf(Char, StringComparison)

Bu dizedeki belirtilen Unicode karakterinin ilk oluşumunun sıfır tabanlı dizinini bildirir.Reports the zero-based index of the first occurrence of the specified Unicode character in this string. Bir parametre belirtilen karakter için kullanılacak arama türünü belirtir.A parameter specifies the type of search to use for the specified character.

IndexOf(Char, Int32)

Bu dizedeki belirtilen Unicode karakterinin ilk oluşumunun sıfır tabanlı dizinini bildirir.Reports the zero-based index of the first occurrence of the specified Unicode character in this string. Arama belirtilen bir karakter konumunda başlar.The search starts at a specified character position.

IndexOf(String)

Bu örnekteki belirtilen dizenin ilk oluşumunun sıfır tabanlı dizinini bildirir.Reports the zero-based index of the first occurrence of the specified string in this instance.

IndexOf(Char)

Bu dizedeki belirtilen Unicode karakterinin ilk oluşumunun sıfır tabanlı dizinini bildirir.Reports the zero-based index of the first occurrence of the specified Unicode character in this string.

IndexOf(String, Int32)

Bu örnekteki belirtilen dizenin ilk oluşumunun sıfır tabanlı dizinini bildirir.Reports the zero-based index of the first occurrence of the specified string in this instance. Arama belirtilen bir karakter konumunda başlar.The search starts at a specified character position.

IndexOf(String, Int32, Int32)

Bu örnekteki belirtilen dizenin ilk oluşumunun sıfır tabanlı dizinini bildirir.Reports the zero-based index of the first occurrence of the specified string in this instance. Arama belirtilen bir karakter konumunda başlar ve belirtilen sayıda karakter konumunu inceler.The search starts at a specified character position and examines a specified number of character positions.

public:
 int IndexOf(System::String ^ value, int startIndex, int count);
public int IndexOf (string value, int startIndex, int count);
member this.IndexOf : string * int * int -> int
Public Function IndexOf (value As String, startIndex As Integer, count As Integer) As Integer

Parametreler

value
String

Aranacak dize.The string to seek.

startIndex
Int32

Arama başlama konumu.The search starting position.

count
Int32

İncelenecek karakter konumlarının sayısı.The number of character positions to examine.

Döndürülenler

Int32

valueBu dize bulunursa geçerli örneğin başından itibaren sıfır tabanlı dizin konumu veya değilse-1.The zero-based index position of value from the start of the current instance if that string is found, or -1 if it is not. valueİse Empty , dönüş değeri olur startIndex .If value is Empty, the return value is startIndex.

Özel durumlar

value, null değeridir.value is null.

count veya startIndex negatif.count or startIndex is negative.

-veya--or-

startIndex Bu dizenin uzunluğundan daha büyük.startIndex is greater than the length of this string.

-veya--or-

count Bu dizenin uzunluğundan daha büyük startIndex .count is greater than the length of this string minus startIndex.

Örnekler

Aşağıdaki örnek, başka bir dizenin alt dizesinde "he" dizesinin tüm tekrarlarının dizinini bulur.The following example finds the index of all occurrences of the string "he" within a substring of another string. Aranacak karakter sayısının her bir arama yinelemesi için yeniden hesaplanması gerektiğini unutmayın.Note that the number of characters to be searched must be recalculated for each search iteration.

// Sample for String::IndexOf(String, Int32, Int32)
using namespace System;
int main()
{
   String^ br1 = "0----+----1----+----2----+----3----+----4----+----5----+----6----+-";
   String^ br2 = "0123456789012345678901234567890123456789012345678901234567890123456";
   String^ str = "Now is the time for all good men to come to the aid of their party.";
   int start;
   int at;
   int end;
   int count;
   end = str->Length;
   start = end / 2;
   Console::WriteLine();
   Console::WriteLine( "All occurrences of 'he' from position {0} to {1}.", start, end - 1 );
   Console::WriteLine( "{1}{0}{2}{0}{3}{0}", Environment::NewLine, br1, br2, str );
   Console::Write( "The string 'he' occurs at position(s): " );
   count = 0;
   at = 0;
   while ( (start <= end) && (at > -1) )
   {
      
      // start+count must be a position within -str-.
      count = end - start;
      at = str->IndexOf( "he", start, count );
      if ( at == -1 )
            break;

      Console::Write( "{0} ", at );
      start = at + 1;
   }

   Console::WriteLine();
}

/*
This example produces the following results:

All occurrences of 'he' from position 33 to 66.
0----+----1----+----2----+----3----+----4----+----5----+----6----+-
0123456789012345678901234567890123456789012345678901234567890123456
Now is the time for all good men to come to the aid of their party.

The string 'he' occurs at position(s): 45 56

*/
string br1 = "0----+----1----+----2----+----3----+----4----+----5----+----6----+---";
string br2 = "012345678901234567890123456789012345678901234567890123456789012345678";
string str = "Now is the time for all good men to come to the aid of their country.";
int start;
int at;
int end;
int count;

end = str.Length;
start = end/2;
Console.WriteLine();
Console.WriteLine("All occurrences of 'he' from position {0} to {1}.", start, end-1);
Console.WriteLine("{1}{0}{2}{0}{3}{0}", Environment.NewLine, br1, br2, str);
Console.Write("The string 'he' occurs at position(s): ");

count = 0;
at = 0;
while((start <= end) && (at > -1))
{
    // start+count must be a position within -str-.
    count = end - start;
    at = str.IndexOf("he", start, count);
    if (at == -1) break;
    Console.Write("{0} ", at);
    start = at+1;
}
Console.WriteLine();

/*
This example produces the following results:

All occurrences of 'he' from position 34 to 68.
0----+----1----+----2----+----3----+----4----+----5----+----6----+---
012345678901234567890123456789012345678901234567890123456789012345678
Now is the time for all good men to come to the aid of their country.

The string 'he' occurs at position(s): 45 56

*/
' Sample for String.IndexOf(String, Int32, Int32)
Class Sample
   
   Public Shared Sub Main()
      
      Dim br1 As String = "0----+----1----+----2----+----3----+----4----+----5----+----6----+-"
      Dim br2 As String = "0123456789012345678901234567890123456789012345678901234567890123456"
      Dim str As String = "Now is the time for all good men to come to the aid of their party."
      Dim start As Integer
      Dim at As Integer
      Dim [end] As Integer
      Dim count As Integer
      
      [end] = str.Length
      start = [end] / 2
      Console.WriteLine()
      Console.WriteLine("All occurrences of 'he' from position {0} to {1}.", start, [end] - 1)
      Console.WriteLine("{1}{0}{2}{0}{3}{0}", Environment.NewLine, br1, br2, str)
      Console.Write("The string 'he' occurs at position(s): ")
      
      count = 0
      at = 0
      While start <= [end] AndAlso at > - 1
         ' start+count must be a position within -str-.
         count = [end] - start
         at = str.IndexOf("he", start, count)
         If at = - 1 Then
            Exit While
         End If
         Console.Write("{0} ", at)
         start = at + 1
      End While
      Console.WriteLine()
   End Sub
End Class
'
'This example produces the following results:
'
'All occurrences of 'he' from position 33 to 66.
'0----+----1----+----2----+----3----+----4----+----5----+----6----+-
'0123456789012345678901234567890123456789012345678901234567890123456
'Now is the time for all good men to come to the aid of their party.
'
'The string 'he' occurs at position(s): 45 56
'
'

Açıklamalar

Dizin numaralandırması 0 (sıfır) ile başlar.Index numbering starts from 0 (zero). startIndexParametresi, 0 ile dize örneğinin uzunluğuna kadar değişebilir.The startIndex parameter can range from 0 to the length of the string instance.

Bu yöntem, geçerli kültür kullanılarak bir sözcük (büyük/küçük harfe ve kültüre duyarlı) araması gerçekleştirir.This method performs a word (case-sensitive and culture-sensitive) search using the current culture. Arama, tarihinde başlar startIndex ve startIndex + count -1 olmaya devam eder.The search begins at startIndex and continues to startIndex + count -1. Konumundaki karakteri startIndex + count aramaya dahil değildir.The character at startIndex + count is not included in the search.

Karakter kümeleri, dilbilimsel veya kültüre duyarlı bir karşılaştırma yapılırken dikkate alınmayan karakterler olan yok sayılabilir karakterler içerir.Character sets include ignorable characters, which are characters that are not considered when performing a linguistic or culture-sensitive comparison. Kültüre duyarlı aramada, yok value sayılamayan bir karakter içeriyorsa sonuç, bu karakteri kaldırılmış şekilde aramayla eşdeğerdir.In a culture-sensitive search, if value contains an ignorable character, the result is equivalent to searching with that character removed. valueYalnızca bir veya daha fazla yoksayılabilir karakter içeriyorsa, yöntem, IndexOf(String, Int32, Int32) startIndex aramanın başladığı karakter konumu olan her zaman döndürülür.If value consists only of one or more ignorable characters, the IndexOf(String, Int32, Int32) method always returns startIndex, which is the character position at which the search begins. Aşağıdaki örnekte, IndexOf(String, Int32, Int32) yöntemi, iki dizelerdeki üçüncü-altıncı karakter konumlarından başlayarak bir "m" tarafından izlenen bir yumuşak tire (U + 00AD) konumunu bulmak için kullanılır.In the following example, the IndexOf(String, Int32, Int32) method is used to find the position of a soft hyphen (U+00AD) followed by an "m" starting in the third through sixth character positions in two strings. Dizelerin yalnızca birinde gereken alt dize var.Only one of the strings contains the required substring. Örnek, .NET Framework 4.NET Framework 4 veya sonraki sürümlerde çalışıyorsa, her iki durumda da, yumuşak tire yoksayılabilir bir karakter olduğundan, yöntem kültüre duyarlı bir karşılaştırma gerçekleştirdiğinde dizedeki "d" dizinini döndürür.If the example is run on the .NET Framework 4.NET Framework 4 or later, 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. Hece ayırma çizgisi ve ardından "m" harfinin geldiği ilk dize söz konusu olduğunda, yöntemin hece ayırma çizgisinin dizinini döndüremediğine ancak onun yerine "m" harfinin dizinini döndürdüğüne dikkat edin.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".

using System;

public class Example
{
    public static void Main()
    {
        string searchString = "\u00ADm";
        string s1 = "ani\u00ADmal" ;
        string s2 = "animal";

        Console.WriteLine(s1.IndexOf(searchString, 2, 4));
        Console.WriteLine(s2.IndexOf(searchString, 2, 4));

        // The example displays the following output:
        //       4
        //       3
    }
}
Module Example
   Public Sub Main()
      Dim searchString As String = Chrw(&h00AD) + "m"
      Dim s1 As String = "ani" + ChrW(&h00AD) + "mal"
      Dim s2 As String = "animal"

      Console.WriteLine(s1.IndexOf(searchString, 2, 4))
      Console.WriteLine(s2.IndexOf(searchString, 2, 4))
   End Sub
End Module
' The example displays the following output:
'       4
'       3

Arayanlara Notlar

Dizeleri kullanmak Için En Iyi Yöntemlerbölümünde açıklandığı gibi, varsayılan değerlerin yerine geçecek dize karşılaştırma yöntemlerinden kaçının ve bunun yerine parametrelerin açıkça belirtilmesini gerektiren yöntemleri çağırın.As explained in Best Practices for Using Strings, we recommend that you avoid calling string comparison methods that substitute default values and instead call methods that require parameters to be explicitly specified. Bu işlemi gerçekleştirmek için geçerli kültürün karşılaştırma kurallarını kullanmak için, IndexOf(String, Int32, Int32, StringComparison) yönteminin bir değeriyle birlikte yöntem aşırı yüklemesini çağırın CurrentCulture comparisonType .To use the comparison rules of the current culture to perform this operation, call the IndexOf(String, Int32, Int32, StringComparison) method overload with a value of CurrentCulture for its comparisonType parameter.

Ayrıca bkz.

Şunlara uygulanır

IndexOf(String, Int32, Int32, StringComparison)

Geçerli nesnede belirtilen dizenin ilk oluşumunun sıfır tabanlı dizinini bildirir String .Reports the zero-based index of the first occurrence of the specified string in the current String object. Parametreler geçerli dizedeki başlangıç arama konumunu, aranacak geçerli dizedeki karakter sayısını ve belirtilen dize için kullanılacak arama türünü belirtir.Parameters specify the starting search position in the current string, the number of characters in the current string to search, and the type of search to use for the specified string.

public:
 int IndexOf(System::String ^ value, int startIndex, int count, StringComparison comparisonType);
public int IndexOf (string value, int startIndex, int count, StringComparison comparisonType);
member this.IndexOf : string * int * int * StringComparison -> int
Public Function IndexOf (value As String, startIndex As Integer, count As Integer, comparisonType As StringComparison) As Integer

Parametreler

value
String

Aranacak dize.The string to seek.

startIndex
Int32

Arama başlama konumu.The search starting position.

count
Int32

İncelenecek karakter konumlarının sayısı.The number of character positions to examine.

comparisonType
StringComparison

Arama kurallarını belirten numaralandırma değerlerinden biri.One of the enumeration values that specifies the rules for the search.

Döndürülenler

Int32

Parametrenin sıfır tabanlı dizin konumu value , bu dize bulunursa geçerli örneğin başından itibaren, veya değilse-1.The zero-based index position of the value parameter from the start of the current instance if that string is found, or -1 if it is not. valueİse Empty , dönüş değeri olur startIndex .If value is Empty, the return value is startIndex.

Özel durumlar

value, null değeridir.value is null.

count veya startIndex negatif.count or startIndex is negative.

-veya--or-

startIndex Bu örneğin uzunluğundan daha büyük.startIndex is greater than the length of this instance.

-veya--or-

count Bu dizenin uzunluğundan daha büyük startIndex .count is greater than the length of this string minus startIndex.

comparisonType geçerli bir değer değil StringComparison .comparisonType is not a valid StringComparison value.

Örnekler

Aşağıdaki örnek, IndexOf numaralandırmanın farklı değerlerini kullanarak başka bir dizedeki bir dizenin ilk oluşumunu bulmak için yönteminin üç aşırı yüklemesini gösterir StringComparison .The following example demonstrates three overloads of the IndexOf method that find the first occurrence of a string within another string using different values of the StringComparison enumeration.

// This code example demonstrates the 
// System.String.IndexOf(String, ..., StringComparison) methods.

using System;
using System.Threading;
using System.Globalization;

class Sample 
{
    public static void Main() 
    {
    string intro = "Find the first occurrence of a character using different " + 
                   "values of StringComparison.";
    string resultFmt = "Comparison: {0,-28} Location: {1,3}";

// Define a string to search for.
// U+00c5 = LATIN CAPITAL LETTER A WITH RING ABOVE
    string CapitalAWithRing = "\u00c5"; 

// Define a string to search. 
// The result of combining the characters LATIN SMALL LETTER A and COMBINING 
// RING ABOVE (U+0061, U+030a) is linguistically equivalent to the character 
// LATIN SMALL LETTER A WITH RING ABOVE (U+00e5).
    string cat = "A Cheshire c" + "\u0061\u030a" + "t";

    int loc = 0;
    StringComparison[] scValues = {
        StringComparison.CurrentCulture,
        StringComparison.CurrentCultureIgnoreCase,
        StringComparison.InvariantCulture,
        StringComparison.InvariantCultureIgnoreCase,
        StringComparison.Ordinal,
        StringComparison.OrdinalIgnoreCase };

// Clear the screen and display an introduction.
    Console.Clear();
    Console.WriteLine(intro);

// Display the current culture because culture affects the result. For example, 
// try this code example with the "sv-SE" (Swedish-Sweden) culture.

    Thread.CurrentThread.CurrentCulture = new CultureInfo("en-US");
    Console.WriteLine("The current culture is \"{0}\" - {1}.", 
                       Thread.CurrentThread.CurrentCulture.Name,
                       Thread.CurrentThread.CurrentCulture.DisplayName);

// Display the string to search for and the string to search.
    Console.WriteLine("Search for the string \"{0}\" in the string \"{1}\"", 
                       CapitalAWithRing, cat);
    Console.WriteLine();

// Note that in each of the following searches, we look for 
// LATIN CAPITAL LETTER A WITH RING ABOVE in a string that contains 
// LATIN SMALL LETTER A WITH RING ABOVE. A result value of -1 indicates 
// the string was not found.
// Search using different values of StringComparison. Specify the start 
// index and count. 

    Console.WriteLine("Part 1: Start index and count are specified.");
    foreach (StringComparison sc in scValues)
        {
        loc = cat.IndexOf(CapitalAWithRing, 0, cat.Length, sc);
        Console.WriteLine(resultFmt, sc, loc);
        }

// Search using different values of StringComparison. Specify the 
// start index. 
    Console.WriteLine("\nPart 2: Start index is specified.");
    foreach (StringComparison sc in scValues)
        {
        loc = cat.IndexOf(CapitalAWithRing, 0, sc);
        Console.WriteLine(resultFmt, sc, loc);
        }

// Search using different values of StringComparison. 
    Console.WriteLine("\nPart 3: Neither start index nor count is specified.");
    foreach (StringComparison sc in scValues)
        {
        loc = cat.IndexOf(CapitalAWithRing, sc);
        Console.WriteLine(resultFmt, sc, loc);
        }
    }
}

/*
Note: This code example was executed on a console whose user interface 
culture is "en-US" (English-United States).

This code example produces the following results:

Find the first occurrence of a character using different values of StringComparison.
The current culture is "en-US" - English (United States).
Search for the string "Å" in the string "A Cheshire ca°t"

Part 1: Start index and count are specified.
Comparison: CurrentCulture               Location:  -1
Comparison: CurrentCultureIgnoreCase     Location:  12
Comparison: InvariantCulture             Location:  -1
Comparison: InvariantCultureIgnoreCase   Location:  12
Comparison: Ordinal                      Location:  -1
Comparison: OrdinalIgnoreCase            Location:  -1

Part 2: Start index is specified.
Comparison: CurrentCulture               Location:  -1
Comparison: CurrentCultureIgnoreCase     Location:  12
Comparison: InvariantCulture             Location:  -1
Comparison: InvariantCultureIgnoreCase   Location:  12
Comparison: Ordinal                      Location:  -1
Comparison: OrdinalIgnoreCase            Location:  -1

Part 3: Neither start index nor count is specified.
Comparison: CurrentCulture               Location:  -1
Comparison: CurrentCultureIgnoreCase     Location:  12
Comparison: InvariantCulture             Location:  -1
Comparison: InvariantCultureIgnoreCase   Location:  12
Comparison: Ordinal                      Location:  -1
Comparison: OrdinalIgnoreCase            Location:  -1

*/
' This code example demonstrates the 
' System.String.IndexOf(String, ..., StringComparison) methods.

Imports System.Threading
Imports System.Globalization

Class Sample
    Public Shared Sub Main() 
        Dim intro As String = "Find the first occurrence of a character using different " & _
                              "values of StringComparison."
        Dim resultFmt As String = "Comparison: {0,-28} Location: {1,3}"
        
        ' Define a string to search for.
        ' U+00c5 = LATIN CAPITAL LETTER A WITH RING ABOVE
        Dim CapitalAWithRing As String = "Å"
        
        ' Define a string to search. 
        ' The result of combining the characters LATIN SMALL LETTER A and COMBINING 
        ' RING ABOVE (U+0061, U+030a) is linguistically equivalent to the character 
        ' LATIN SMALL LETTER A WITH RING ABOVE (U+00e5).
        Dim cat As String = "A Cheshire c" & "å" & "t"
        
        Dim loc As Integer = 0
        Dim scValues As StringComparison() =  { _
                        StringComparison.CurrentCulture, _
                        StringComparison.CurrentCultureIgnoreCase, _
                        StringComparison.InvariantCulture, _
                        StringComparison.InvariantCultureIgnoreCase, _
                        StringComparison.Ordinal, _
                        StringComparison.OrdinalIgnoreCase }
        Dim sc As StringComparison
        
        ' Clear the screen and display an introduction.
        Console.Clear()
        Console.WriteLine(intro)
        
        ' Display the current culture because culture affects the result. For example, 
        ' try this code example with the "sv-SE" (Swedish-Sweden) culture.
        Thread.CurrentThread.CurrentCulture = New CultureInfo("en-US")
        Console.WriteLine("The current culture is ""{0}"" - {1}.", _
                           Thread.CurrentThread.CurrentCulture.Name, _ 
                           Thread.CurrentThread.CurrentCulture.DisplayName)
        
        ' Display the string to search for and the string to search.
        Console.WriteLine("Search for the string ""{0}"" in the string ""{1}""", _
                           CapitalAWithRing, cat)
        Console.WriteLine()
        
        ' Note that in each of the following searches, we look for 
        ' LATIN CAPITAL LETTER A WITH RING ABOVE in a string that contains 
        ' LATIN SMALL LETTER A WITH RING ABOVE. A result value of -1 indicates 
        ' the string was not found.
        ' Search using different values of StringComparison. Specify the start 
        ' index and count.

        Console.WriteLine("Part 1: Start index and count are specified.")
        For Each sc In  scValues
            loc = cat.IndexOf(CapitalAWithRing, 0, cat.Length, sc)
            Console.WriteLine(resultFmt, sc, loc)
        Next sc
        
        ' Search using different values of StringComparison. Specify the 
        ' start index. 

        Console.WriteLine(vbCrLf & "Part 2: Start index is specified.")
        For Each sc In  scValues
            loc = cat.IndexOf(CapitalAWithRing, 0, sc)
            Console.WriteLine(resultFmt, sc, loc)
        Next sc
        
        ' Search using different values of StringComparison. 

        Console.WriteLine(vbCrLf & "Part 3: Neither start index nor count is specified.")
        For Each sc In  scValues
            loc = cat.IndexOf(CapitalAWithRing, sc)
            Console.WriteLine(resultFmt, sc, loc)
        Next sc
    
    End Sub
End Class

'
'Note: This code example was executed on a console whose user interface 
'culture is "en-US" (English-United States).
'
'This code example produces the following results:
'
'Find the first occurrence of a character using different values of StringComparison.
'The current culture is "en-US" - English (United States).
'Search for the string "Å" in the string "A Cheshire ca°t"
'
'Part 1: Start index and count are specified.
'Comparison: CurrentCulture               Location:  -1
'Comparison: CurrentCultureIgnoreCase     Location:  12
'Comparison: InvariantCulture             Location:  -1
'Comparison: InvariantCultureIgnoreCase   Location:  12
'Comparison: Ordinal                      Location:  -1
'Comparison: OrdinalIgnoreCase            Location:  -1
'
'Part 2: Start index is specified.
'Comparison: CurrentCulture               Location:  -1
'Comparison: CurrentCultureIgnoreCase     Location:  12
'Comparison: InvariantCulture             Location:  -1
'Comparison: InvariantCultureIgnoreCase   Location:  12
'Comparison: Ordinal                      Location:  -1
'Comparison: OrdinalIgnoreCase            Location:  -1
'
'Part 3: Neither start index nor count is specified.
'Comparison: CurrentCulture               Location:  -1
'Comparison: CurrentCultureIgnoreCase     Location:  12
'Comparison: InvariantCulture             Location:  -1
'Comparison: InvariantCultureIgnoreCase   Location:  12
'Comparison: Ordinal                      Location:  -1
'Comparison: OrdinalIgnoreCase            Location:  -1
'

Açıklamalar

Dizin numaralandırması 0 (sıfır) ile başlar.Index numbering starts from 0 (zero). startIndexParametresi, 0 ile dize örneğinin uzunluğuna kadar değişebilir.The startIndex parameter can range from 0 to the length of the string instance.

Arama, tarihinde başlar startIndex ve startIndex + count -1 olmaya devam eder.The search begins at startIndex and continues to startIndex + count -1. Konumundaki karakteri startIndex + count aramaya dahil değildir.The character at startIndex + count is not included in the search.

comparisonTypeParametresi, value geçerli veya sabit kültür kullanılarak, büyük/küçük harfe duyarlı veya büyük/küçük harfe duyarsız bir arama kullanarak ve Word veya Ordinal karşılaştırma kurallarını kullanarak parametreyi aramak için belirtir.The comparisonType parameter specifies to search for the value parameter using the current or invariant culture, using a case-sensitive or case-insensitive search, and using word or ordinal comparison rules.

Arayanlara Notlar

Karakter kümeleri, dilbilimsel veya kültüre duyarlı bir karşılaştırma yapılırken dikkate alınmayan karakterler olan yok sayılabilir karakterler içerir.Character sets include ignorable characters, which are characters that are not considered when performing a linguistic or culture-sensitive comparison. Kültüre duyarlı bir aramada ( comparisonType Ordinal veya değilse OrdinalIgnoreCase ), yok value sayılamayan bir karakter içeriyorsa sonuç, bu karakter kaldırılmış şekilde aramaya eşdeğerdir.In a culture-sensitive search (that is, if comparisonType is not Ordinal or OrdinalIgnoreCase), if value contains an ignorable character, the result is equivalent to searching with that character removed. valueYalnızca bir veya daha fazla yoksayılabilir karakter içeriyorsa, yöntem, IndexOf(String, Int32, Int32, StringComparison) startIndex aramanın başladığı karakter konumu olan her zaman döndürülür.If value consists only of one or more ignorable characters, the IndexOf(String, Int32, Int32, StringComparison) method always returns startIndex, which is the character position at which the search begins.

Aşağıdaki örnekte, IndexOf(String, Int32, Int32, StringComparison) yöntemi, iki dizelerdeki üçüncü-altıncı karakter konumlarından başlayarak bir "m" tarafından izlenen bir yumuşak tire (U + 00AD) konumunu bulmak için kullanılır.In the following example, the IndexOf(String, Int32, Int32, StringComparison) method is used to find the position of a soft hyphen (U+00AD) followed by an "m" starting in the third through sixth character positions in two strings. Dizelerin yalnızca birinde gereken alt dize var.Only one of the strings contains the required substring. Örnek, .NET Framework 4.NET Framework 4 veya sonraki sürümlerde çalışıyorsa, her iki durumda da, yumuşak tire yoksayılabilir bir karakter olduğundan, yöntem kültüre duyarlı bir karşılaştırma gerçekleştirdiğinde dizedeki "d" dizinini döndürür.If the example is run on the .NET Framework 4.NET Framework 4 or later, 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. Ancak, bir sıralı karşılaştırma gerçekleştirdiğinde, alt dizeyi yalnızca ilk dizede bulur.When it performs an ordinal comparison, however, it finds the substring only in the first string. İlk dize olması durumunda, "e" tarafından izlenen yumuşak tireyi içeren, yöntemin yumuşak tire dizinini döndürmediğinde, bunun yerine kültüre duyarlı bir karşılaştırma gerçekleştirdiğinde "e" dizininin dizinini döndürdüğüne unutmayın.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. Yöntem, yalnızca bir sıra karşılaştırma yapıldığında ilk dizede hece ayırma çizgisinin dizinini döndürür.The method returns the index of the soft hyphen in the first string only when it performs an ordinal comparison.

[! Code-CSharpSystem. String. IndexOf # 24] [! Code-vbSystem. String. IndexOf # 24][!code-csharpSystem.String.IndexOf#24] [!code-vbSystem.String.IndexOf#24]

Şunlara uygulanır

IndexOf(String, Int32, StringComparison)

Geçerli nesnede belirtilen dizenin ilk oluşumunun sıfır tabanlı dizinini bildirir String .Reports the zero-based index of the first occurrence of the specified string in the current String object. Parametreler geçerli dizedeki başlangıç arama konumunu ve belirtilen dize için kullanılacak arama türünü belirtir.Parameters specify the starting search position in the current string and the type of search to use for the specified string.

public:
 int IndexOf(System::String ^ value, int startIndex, StringComparison comparisonType);
public int IndexOf (string value, int startIndex, StringComparison comparisonType);
member this.IndexOf : string * int * StringComparison -> int
Public Function IndexOf (value As String, startIndex As Integer, comparisonType As StringComparison) As Integer

Parametreler

value
String

Aranacak dize.The string to seek.

startIndex
Int32

Arama başlama konumu.The search starting position.

comparisonType
StringComparison

Arama kurallarını belirten numaralandırma değerlerinden biri.One of the enumeration values that specifies the rules for the search.

Döndürülenler

Int32

Parametrenin sıfır tabanlı dizin konumu value , bu dize bulunursa geçerli örneğin başından itibaren, veya değilse-1.The zero-based index position of the value parameter from the start of the current instance if that string is found, or -1 if it is not. valueİse Empty , dönüş değeri olur startIndex .If value is Empty, the return value is startIndex.

Özel durumlar

value, null değeridir.value is null.

startIndex 0 ' dan (sıfır) veya bu dizenin uzunluğundan daha büyük.startIndex is less than 0 (zero) or greater than the length of this string.

comparisonType geçerli bir değer değil StringComparison .comparisonType is not a valid StringComparison value.

Örnekler

Aşağıdaki örnek, IndexOf numaralandırmanın farklı değerlerini kullanarak başka bir dizedeki bir dizenin ilk oluşumunu bulmak için yönteminin üç aşırı yüklemesini gösterir StringComparison .The following example demonstrates three overloads of the IndexOf method that find the first occurrence of a string within another string using different values of the StringComparison enumeration.

// This code example demonstrates the 
// System.String.IndexOf(String, ..., StringComparison) methods.

using System;
using System.Threading;
using System.Globalization;

class Sample 
{
    public static void Main() 
    {
    string intro = "Find the first occurrence of a character using different " + 
                   "values of StringComparison.";
    string resultFmt = "Comparison: {0,-28} Location: {1,3}";

// Define a string to search for.
// U+00c5 = LATIN CAPITAL LETTER A WITH RING ABOVE
    string CapitalAWithRing = "\u00c5"; 

// Define a string to search. 
// The result of combining the characters LATIN SMALL LETTER A and COMBINING 
// RING ABOVE (U+0061, U+030a) is linguistically equivalent to the character 
// LATIN SMALL LETTER A WITH RING ABOVE (U+00e5).
    string cat = "A Cheshire c" + "\u0061\u030a" + "t";

    int loc = 0;
    StringComparison[] scValues = {
        StringComparison.CurrentCulture,
        StringComparison.CurrentCultureIgnoreCase,
        StringComparison.InvariantCulture,
        StringComparison.InvariantCultureIgnoreCase,
        StringComparison.Ordinal,
        StringComparison.OrdinalIgnoreCase };

// Clear the screen and display an introduction.
    Console.Clear();
    Console.WriteLine(intro);

// Display the current culture because culture affects the result. For example, 
// try this code example with the "sv-SE" (Swedish-Sweden) culture.

    Thread.CurrentThread.CurrentCulture = new CultureInfo("en-US");
    Console.WriteLine("The current culture is \"{0}\" - {1}.", 
                       Thread.CurrentThread.CurrentCulture.Name,
                       Thread.CurrentThread.CurrentCulture.DisplayName);

// Display the string to search for and the string to search.
    Console.WriteLine("Search for the string \"{0}\" in the string \"{1}\"", 
                       CapitalAWithRing, cat);
    Console.WriteLine();

// Note that in each of the following searches, we look for 
// LATIN CAPITAL LETTER A WITH RING ABOVE in a string that contains 
// LATIN SMALL LETTER A WITH RING ABOVE. A result value of -1 indicates 
// the string was not found.
// Search using different values of StringComparison. Specify the start 
// index and count. 

    Console.WriteLine("Part 1: Start index and count are specified.");
    foreach (StringComparison sc in scValues)
        {
        loc = cat.IndexOf(CapitalAWithRing, 0, cat.Length, sc);
        Console.WriteLine(resultFmt, sc, loc);
        }

// Search using different values of StringComparison. Specify the 
// start index. 
    Console.WriteLine("\nPart 2: Start index is specified.");
    foreach (StringComparison sc in scValues)
        {
        loc = cat.IndexOf(CapitalAWithRing, 0, sc);
        Console.WriteLine(resultFmt, sc, loc);
        }

// Search using different values of StringComparison. 
    Console.WriteLine("\nPart 3: Neither start index nor count is specified.");
    foreach (StringComparison sc in scValues)
        {
        loc = cat.IndexOf(CapitalAWithRing, sc);
        Console.WriteLine(resultFmt, sc, loc);
        }
    }
}

/*
Note: This code example was executed on a console whose user interface 
culture is "en-US" (English-United States).

This code example produces the following results:

Find the first occurrence of a character using different values of StringComparison.
The current culture is "en-US" - English (United States).
Search for the string "Å" in the string "A Cheshire ca°t"

Part 1: Start index and count are specified.
Comparison: CurrentCulture               Location:  -1
Comparison: CurrentCultureIgnoreCase     Location:  12
Comparison: InvariantCulture             Location:  -1
Comparison: InvariantCultureIgnoreCase   Location:  12
Comparison: Ordinal                      Location:  -1
Comparison: OrdinalIgnoreCase            Location:  -1

Part 2: Start index is specified.
Comparison: CurrentCulture               Location:  -1
Comparison: CurrentCultureIgnoreCase     Location:  12
Comparison: InvariantCulture             Location:  -1
Comparison: InvariantCultureIgnoreCase   Location:  12
Comparison: Ordinal                      Location:  -1
Comparison: OrdinalIgnoreCase            Location:  -1

Part 3: Neither start index nor count is specified.
Comparison: CurrentCulture               Location:  -1
Comparison: CurrentCultureIgnoreCase     Location:  12
Comparison: InvariantCulture             Location:  -1
Comparison: InvariantCultureIgnoreCase   Location:  12
Comparison: Ordinal                      Location:  -1
Comparison: OrdinalIgnoreCase            Location:  -1

*/
' This code example demonstrates the 
' System.String.IndexOf(String, ..., StringComparison) methods.

Imports System.Threading
Imports System.Globalization

Class Sample
    Public Shared Sub Main() 
        Dim intro As String = "Find the first occurrence of a character using different " & _
                              "values of StringComparison."
        Dim resultFmt As String = "Comparison: {0,-28} Location: {1,3}"
        
        ' Define a string to search for.
        ' U+00c5 = LATIN CAPITAL LETTER A WITH RING ABOVE
        Dim CapitalAWithRing As String = "Å"
        
        ' Define a string to search. 
        ' The result of combining the characters LATIN SMALL LETTER A and COMBINING 
        ' RING ABOVE (U+0061, U+030a) is linguistically equivalent to the character 
        ' LATIN SMALL LETTER A WITH RING ABOVE (U+00e5).
        Dim cat As String = "A Cheshire c" & "å" & "t"
        
        Dim loc As Integer = 0
        Dim scValues As StringComparison() =  { _
                        StringComparison.CurrentCulture, _
                        StringComparison.CurrentCultureIgnoreCase, _
                        StringComparison.InvariantCulture, _
                        StringComparison.InvariantCultureIgnoreCase, _
                        StringComparison.Ordinal, _
                        StringComparison.OrdinalIgnoreCase }
        Dim sc As StringComparison
        
        ' Clear the screen and display an introduction.
        Console.Clear()
        Console.WriteLine(intro)
        
        ' Display the current culture because culture affects the result. For example, 
        ' try this code example with the "sv-SE" (Swedish-Sweden) culture.
        Thread.CurrentThread.CurrentCulture = New CultureInfo("en-US")
        Console.WriteLine("The current culture is ""{0}"" - {1}.", _
                           Thread.CurrentThread.CurrentCulture.Name, _ 
                           Thread.CurrentThread.CurrentCulture.DisplayName)
        
        ' Display the string to search for and the string to search.
        Console.WriteLine("Search for the string ""{0}"" in the string ""{1}""", _
                           CapitalAWithRing, cat)
        Console.WriteLine()
        
        ' Note that in each of the following searches, we look for 
        ' LATIN CAPITAL LETTER A WITH RING ABOVE in a string that contains 
        ' LATIN SMALL LETTER A WITH RING ABOVE. A result value of -1 indicates 
        ' the string was not found.
        ' Search using different values of StringComparison. Specify the start 
        ' index and count.

        Console.WriteLine("Part 1: Start index and count are specified.")
        For Each sc In  scValues
            loc = cat.IndexOf(CapitalAWithRing, 0, cat.Length, sc)
            Console.WriteLine(resultFmt, sc, loc)
        Next sc
        
        ' Search using different values of StringComparison. Specify the 
        ' start index. 

        Console.WriteLine(vbCrLf & "Part 2: Start index is specified.")
        For Each sc In  scValues
            loc = cat.IndexOf(CapitalAWithRing, 0, sc)
            Console.WriteLine(resultFmt, sc, loc)
        Next sc
        
        ' Search using different values of StringComparison. 

        Console.WriteLine(vbCrLf & "Part 3: Neither start index nor count is specified.")
        For Each sc In  scValues
            loc = cat.IndexOf(CapitalAWithRing, sc)
            Console.WriteLine(resultFmt, sc, loc)
        Next sc
    
    End Sub
End Class

'
'Note: This code example was executed on a console whose user interface 
'culture is "en-US" (English-United States).
'
'This code example produces the following results:
'
'Find the first occurrence of a character using different values of StringComparison.
'The current culture is "en-US" - English (United States).
'Search for the string "Å" in the string "A Cheshire ca°t"
'
'Part 1: Start index and count are specified.
'Comparison: CurrentCulture               Location:  -1
'Comparison: CurrentCultureIgnoreCase     Location:  12
'Comparison: InvariantCulture             Location:  -1
'Comparison: InvariantCultureIgnoreCase   Location:  12
'Comparison: Ordinal                      Location:  -1
'Comparison: OrdinalIgnoreCase            Location:  -1
'
'Part 2: Start index is specified.
'Comparison: CurrentCulture               Location:  -1
'Comparison: CurrentCultureIgnoreCase     Location:  12
'Comparison: InvariantCulture             Location:  -1
'Comparison: InvariantCultureIgnoreCase   Location:  12
'Comparison: Ordinal                      Location:  -1
'Comparison: OrdinalIgnoreCase            Location:  -1
'
'Part 3: Neither start index nor count is specified.
'Comparison: CurrentCulture               Location:  -1
'Comparison: CurrentCultureIgnoreCase     Location:  12
'Comparison: InvariantCulture             Location:  -1
'Comparison: InvariantCultureIgnoreCase   Location:  12
'Comparison: Ordinal                      Location:  -1
'Comparison: OrdinalIgnoreCase            Location:  -1
'

Açıklamalar

Dizin numaralandırması 0 ' dan başlar.Index numbering starts from 0. startIndexParametresi, 0 ile dize örneğinin uzunluğuna kadar değişebilir.The startIndex parameter can range from 0 to the length of the string instance. startIndexDize örneğinin uzunluğuna eşitse, Yöntem-1 döndürür.If startIndex equals the length of the string instance, the method returns -1.

comparisonTypeParametresi, value geçerli veya sabit kültür kullanılarak, büyük/küçük harfe duyarlı veya büyük/küçük harfe duyarsız bir arama kullanarak ve Word veya Ordinal karşılaştırma kurallarını kullanarak parametreyi aramak için belirtir.The comparisonType parameter specifies to search for the value parameter using the current or invariant culture, using a case-sensitive or case-insensitive search, and using word or ordinal comparison rules.

Arayanlara Notlar

Karakter kümeleri, dilbilimsel veya kültüre duyarlı bir karşılaştırma yapılırken dikkate alınmayan karakterler olan yok sayılabilir karakterler içerir.Character sets include ignorable characters, which are characters that are not considered when performing a linguistic or culture-sensitive comparison. Kültüre duyarlı bir aramada ( comparisonType Ordinal veya değilse OrdinalIgnoreCase ), yok value sayılamayan bir karakter içeriyorsa sonuç, bu karakter kaldırılmış şekilde aramaya eşdeğerdir.In a culture-sensitive search (that is, if comparisonType is not Ordinal or OrdinalIgnoreCase), if value contains an ignorable character, the result is equivalent to searching with that character removed. valueYalnızca bir veya daha fazla yoksayılabilir karakter içeriyorsa, yöntem, IndexOf(String, Int32, StringComparison) startIndex aramanın başladığı karakter konumu olan her zaman döndürülür.If value consists only of one or more ignorable characters, the IndexOf(String, Int32, StringComparison) method always returns startIndex, which is the character position at which the search begins.

Aşağıdaki örnekte, IndexOf(String, Int32, StringComparison) yöntemi, iki dizelerdeki üçüncü karakter konumundan itibaren bir "m" tarafından izlenen bir yumuşak tire (U + 00AD) konumunu bulmak için kullanılır.In the following example, the IndexOf(String, Int32, StringComparison) method is used to find the position of a soft hyphen (U+00AD) followed by an "m" starting with the third character position in two strings. Dizelerin yalnızca birinde gereken alt dize var.Only one of the strings contains the required substring. Örnek, .NET Framework 4.NET Framework 4 veya sonraki sürümlerde çalışıyorsa, her iki durumda da, yumuşak tire yoksayılabilir bir karakter olduğundan, yöntem kültüre duyarlı bir karşılaştırma gerçekleştirdiğinde dizedeki "d" dizinini döndürür.If the example is run on the .NET Framework 4.NET Framework 4 or later, 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. Hece ayırma çizgisi ve ardından "m" harfinin geldiği ilk dize söz konusu olduğunda, yöntemin hece ayırma çizgisinin dizinini döndüremediğine ancak onun yerine "m" harfinin dizinini döndürdüğüne dikkat edin.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". Yöntem, yalnızca bir sıra karşılaştırma yapıldığında ilk dizede hece ayırma çizgisinin dizinini döndürür.The method returns the index of the soft hyphen in the first string only when it performs an ordinal comparison.

[! Code-CSharpSystem. String. IndexOf # 25] [! Code-vbSystem. String. IndexOf # 25][!code-csharpSystem.String.IndexOf#25] [!code-vbSystem.String.IndexOf#25]

Şunlara uygulanır

IndexOf(Char, Int32, Int32)

Bu örnekte belirtilen karakterin ilk oluşumunun sıfır tabanlı dizinini bildirir.Reports the zero-based index of the first occurrence of the specified character in this instance. Arama belirtilen bir karakter konumunda başlar ve belirtilen sayıda karakter konumunu inceler.The search starts at a specified character position and examines a specified number of character positions.

public:
 int IndexOf(char value, int startIndex, int count);
public int IndexOf (char value, int startIndex, int count);
member this.IndexOf : char * int * int -> int
Public Function IndexOf (value As Char, startIndex As Integer, count As Integer) As Integer

Parametreler

value
Char

Aranacak Unicode karakteri.A Unicode character to seek.

startIndex
Int32

Arama başlama konumu.The search starting position.

count
Int32

İncelenecek karakter konumlarının sayısı.The number of character positions to examine.

Döndürülenler

Int32

valueBu karakter bulunursa dizenin başından itibaren sıfır tabanlı dizin konumu veya değilse-1.The zero-based index position of value from the start of the string if that character is found, or -1 if it is not.

Özel durumlar

count veya startIndex negatif.count or startIndex is negative.

-veya--or-

startIndex Bu dizenin uzunluğundan daha büyük.startIndex is greater than the length of this string.

-veya--or-

count Bu dizenin uzunluğundan daha büyük startIndex .count is greater than the length of this string minus startIndex.

Örnekler

Aşağıdaki örnek IndexOf yöntemini gösterir.The following example demonstrates the IndexOf method.

// Example for the String::IndexOf( Char, int, int ) method.
using namespace System;
void FindAllChar( Char target, String^ searched )
{
   Console::Write( "The character '{0}' occurs at position(s): ", target );
   int startIndex = -1;
   int hitCount = 0;
   
   // Search for all occurrences of the target.
   while ( true )
   {
      startIndex = searched->IndexOf( target, startIndex + 1, searched->Length - startIndex - 1 );
      
      // Exit the loop if the target is not found.
      if ( startIndex < 0 )
            break;

      Console::Write( "{0}, ", startIndex );
      hitCount++;
   }

   Console::WriteLine( "occurrences: {0}", hitCount );
}

int main()
{
   String^ br1 = "0----+----1----+----2----+----3----+----"
   "4----+----5----+----6----+----7";
   String^ br2 = "0123456789012345678901234567890123456789"
   "0123456789012345678901234567890";
   String^ str = "ABCDEFGHI abcdefghi ABCDEFGHI abcdefghi "
   "ABCDEFGHI abcdefghi ABCDEFGHI";
   Console::WriteLine( "This example of String::IndexOf( Char, int, int )\n"
   "generates the following output." );
   Console::WriteLine( "{0}{1}{0}{2}{0}{3}{0}", Environment::NewLine, br1, br2, str );
   FindAllChar( 'A', str );
   FindAllChar( 'a', str );
   FindAllChar( 'I', str );
   FindAllChar( 'i', str );
   FindAllChar( '@', str );
   FindAllChar( ' ', str );
}

/*
This example of String::IndexOf( Char, int, int )
generates the following output.

0----+----1----+----2----+----3----+----4----+----5----+----6----+----7
01234567890123456789012345678901234567890123456789012345678901234567890
ABCDEFGHI abcdefghi ABCDEFGHI abcdefghi ABCDEFGHI abcdefghi ABCDEFGHI

The character 'A' occurs at position(s): 0, 20, 40, 60, occurrences: 4
The character 'a' occurs at position(s): 10, 30, 50, occurrences: 3
The character 'I' occurs at position(s): 8, 28, 48, 68, occurrences: 4
The character 'i' occurs at position(s): 18, 38, 58, occurrences: 3
The character '@' occurs at position(s): occurrences: 0
The character ' ' occurs at position(s): 9, 19, 29, 39, 49, 59, occurrences: 6
*/
// Example for the String.IndexOf( char, int, int ) method.
using System;

class IndexOfCII 
{
    public static void Main() 
    {
        string br1 = 
            "0----+----1----+----2----+----3----+----" +
            "4----+----5----+----6----+----7";
        string br2 = 
            "0123456789012345678901234567890123456789" +
            "0123456789012345678901234567890";
        string str = 
            "ABCDEFGHI abcdefghi ABCDEFGHI abcdefghi " +
            "ABCDEFGHI abcdefghi ABCDEFGHI";

        Console.WriteLine( 
            "This example of String.IndexOf( char, int, int )\n" +
            "generates the following output." );
        Console.WriteLine( 
            "{0}{1}{0}{2}{0}{3}{0}", 
            Environment.NewLine, br1, br2, str );

        FindAllChar( 'A', str );
        FindAllChar( 'a', str );
        FindAllChar( 'I', str );
        FindAllChar( 'i', str );
        FindAllChar( '@', str );
        FindAllChar( ' ', str );
    }

    static void FindAllChar( Char target, String searched )
    {
        Console.Write( 
            "The character '{0}' occurs at position(s): ", 
            target );

        int     startIndex = -1;
        int     hitCount = 0;

        // Search for all occurrences of the target.
        while( true )
        {
            startIndex = searched.IndexOf( 
                target, startIndex + 1, 
                searched.Length - startIndex - 1 );

            // Exit the loop if the target is not found.
            if( startIndex < 0 )
                break;

            Console.Write( "{0}, ", startIndex );
            hitCount++;
        }

        Console.WriteLine( "occurrences: {0}", hitCount );
    }
}

/*
This example of String.IndexOf( char, int, int )
generates the following output.

0----+----1----+----2----+----3----+----4----+----5----+----6----+----7
01234567890123456789012345678901234567890123456789012345678901234567890
ABCDEFGHI abcdefghi ABCDEFGHI abcdefghi ABCDEFGHI abcdefghi ABCDEFGHI

The character 'A' occurs at position(s): 0, 20, 40, 60, occurrences: 4
The character 'a' occurs at position(s): 10, 30, 50, occurrences: 3
The character 'I' occurs at position(s): 8, 28, 48, 68, occurrences: 4
The character 'i' occurs at position(s): 18, 38, 58, occurrences: 3
The character '@' occurs at position(s): occurrences: 0
The character ' ' occurs at position(s): 9, 19, 29, 39, 49, 59, occurrences: 6
*/
' Example for the String.IndexOf( Char, Integer, Integer ) method.
Module IndexOfCII
   
    Sub Main()
        Dim br1 As String = _
            "0----+----1----+----2----+----3----+----" & _
            "4----+----5----+----6----+----7"
        Dim br2 As String = _
            "0123456789012345678901234567890123456789" & _
            "0123456789012345678901234567890"
        Dim str As String = _
            "ABCDEFGHI abcdefghi ABCDEFGHI abcdefghi " & _
            "ABCDEFGHI abcdefghi ABCDEFGHI"
          
        Console.WriteLine( _
            "This example of String.IndexOf( Char, Integer, Integer )" & _
            vbCrLf & "generates the following output." )
        Console.WriteLine( _
            "{0}{1}{0}{2}{0}{3}{0}", _
            Environment.NewLine, br1, br2, str)

        FindAllChar("A"c, str)
        FindAllChar("a"c, str)
        FindAllChar("I"c, str)
        FindAllChar("i"c, str)
        FindAllChar("@"c, str)
        FindAllChar(" "c, str)
    End Sub
       
    Sub FindAllChar(target As Char, searched As String)

        Console.Write( _
            "The character ""{0}"" occurs at position(s): ", target)
          
        Dim startIndex As Integer = - 1
        Dim hitCount As Integer = 0
          
        ' Search for all occurrences of the target.
        While True
            startIndex = searched.IndexOf( _
                target, startIndex + 1, _
                searched.Length - startIndex - 1)

            ' Exit the loop if the target is not found.
            If startIndex < 0 Then
                Exit While
            End If 

            Console.Write("{0}, ", startIndex)
            hitCount += 1
        End While
          
        Console.WriteLine("occurrences: {0}", hitCount)

    End Sub
End Module 'IndexOfCII

' This example of String.IndexOf( Char, Integer, Integer )
' generates the following output.
' 
' 0----+----1----+----2----+----3----+----4----+----5----+----6----+----7
' 01234567890123456789012345678901234567890123456789012345678901234567890
' ABCDEFGHI abcdefghi ABCDEFGHI abcdefghi ABCDEFGHI abcdefghi ABCDEFGHI
' 
' The character "A" occurs at position(s): 0, 20, 40, 60, occurrences: 4
' The character "a" occurs at position(s): 10, 30, 50, occurrences: 3
' The character "I" occurs at position(s): 8, 28, 48, 68, occurrences: 4
' The character "i" occurs at position(s): 18, 38, 58, occurrences: 3
' The character "@" occurs at position(s): occurrences: 0
' The character " " occurs at position(s): 9, 19, 29, 39, 49, 59, occurrences: 6

Açıklamalar

Arama, tarihinde başlar startIndex ve startIndex + count -1 olmaya devam eder.The search begins at startIndex and continues to startIndex + count -1. Konumundaki karakteri startIndex + count aramaya dahil değildir.The character at startIndex + count is not included in the search.

Dizin numaralandırması 0 (sıfır) ile başlar.Index numbering starts from 0 (zero). startIndexParametresi, 0 ile dize örneğinin uzunluğuna kadar değişebilir.The startIndex parameter can range from 0 to the length of the string instance.

Bu yöntem, yalnızca kendi Unicode skalar değerleri aynıysa, bir karakterin başka bir karaktere eşit kabul edildiği bir sıra (kültür duyarlı olmayan) araması gerçekleştirir.This method performs an ordinal (culture-insensitive) search, where a character is considered equivalent to another character only if their Unicode scalar values are the same. Kültüre duyarlı arama gerçekleştirmek için, CompareInfo.IndexOf "Æ" (u + 00C6) gibi önceden oluşturulmuş bir karakteri temsil eden bir Unicode skaler değeri, kültüre bağlı olarak, "AE" (u + 0041, u + 0045) gibi, bir karakter bileşeninin doğru sırada herhangi bir oluşumuna eşdeğer olarak düşünülebilir.To perform a culture-sensitive search, use the CompareInfo.IndexOf method, where a Unicode scalar 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.

Ayrıca bkz.

Şunlara uygulanır

IndexOf(String, StringComparison)

Geçerli nesnede belirtilen dizenin ilk oluşumunun sıfır tabanlı dizinini bildirir String .Reports the zero-based index of the first occurrence of the specified string in the current String object. Bir parametre, belirtilen dize için kullanılacak arama türünü belirtir.A parameter specifies the type of search to use for the specified string.

public:
 int IndexOf(System::String ^ value, StringComparison comparisonType);
public int IndexOf (string value, StringComparison comparisonType);
member this.IndexOf : string * StringComparison -> int
Public Function IndexOf (value As String, comparisonType As StringComparison) As Integer

Parametreler

value
String

Aranacak dize.The string to seek.

comparisonType
StringComparison

Arama kurallarını belirten numaralandırma değerlerinden biri.One of the enumeration values that specifies the rules for the search.

Döndürülenler

Int32

valueBu dize bulunursa parametrenin dizin konumu veya değilse-1.The index position of the value parameter if that string is found, or -1 if it is not. valueİse Empty , dönüş değeri 0 ' dır.If value is Empty, the return value is 0.

Özel durumlar

value, null değeridir.value is null.

comparisonType geçerli bir değer değil StringComparison .comparisonType is not a valid StringComparison value.

Örnekler

Aşağıdaki örnek, IndexOf numaralandırmanın farklı değerlerini kullanarak başka bir dizedeki bir dizenin ilk oluşumunu bulmak için yönteminin üç aşırı yüklemesini gösterir StringComparison .The following example demonstrates three overloads of the IndexOf method that find the first occurrence of a string within another string using different values of the StringComparison enumeration.

// This code example demonstrates the 
// System.String.IndexOf(String, ..., StringComparison) methods.

using System;
using System.Threading;
using System.Globalization;

class Sample 
{
    public static void Main() 
    {
    string intro = "Find the first occurrence of a character using different " + 
                   "values of StringComparison.";
    string resultFmt = "Comparison: {0,-28} Location: {1,3}";

// Define a string to search for.
// U+00c5 = LATIN CAPITAL LETTER A WITH RING ABOVE
    string CapitalAWithRing = "\u00c5"; 

// Define a string to search. 
// The result of combining the characters LATIN SMALL LETTER A and COMBINING 
// RING ABOVE (U+0061, U+030a) is linguistically equivalent to the character 
// LATIN SMALL LETTER A WITH RING ABOVE (U+00e5).
    string cat = "A Cheshire c" + "\u0061\u030a" + "t";

    int loc = 0;
    StringComparison[] scValues = {
        StringComparison.CurrentCulture,
        StringComparison.CurrentCultureIgnoreCase,
        StringComparison.InvariantCulture,
        StringComparison.InvariantCultureIgnoreCase,
        StringComparison.Ordinal,
        StringComparison.OrdinalIgnoreCase };

// Clear the screen and display an introduction.
    Console.Clear();
    Console.WriteLine(intro);

// Display the current culture because culture affects the result. For example, 
// try this code example with the "sv-SE" (Swedish-Sweden) culture.

    Thread.CurrentThread.CurrentCulture = new CultureInfo("en-US");
    Console.WriteLine("The current culture is \"{0}\" - {1}.", 
                       Thread.CurrentThread.CurrentCulture.Name,
                       Thread.CurrentThread.CurrentCulture.DisplayName);

// Display the string to search for and the string to search.
    Console.WriteLine("Search for the string \"{0}\" in the string \"{1}\"", 
                       CapitalAWithRing, cat);
    Console.WriteLine();

// Note that in each of the following searches, we look for 
// LATIN CAPITAL LETTER A WITH RING ABOVE in a string that contains 
// LATIN SMALL LETTER A WITH RING ABOVE. A result value of -1 indicates 
// the string was not found.
// Search using different values of StringComparison. Specify the start 
// index and count. 

    Console.WriteLine("Part 1: Start index and count are specified.");
    foreach (StringComparison sc in scValues)
        {
        loc = cat.IndexOf(CapitalAWithRing, 0, cat.Length, sc);
        Console.WriteLine(resultFmt, sc, loc);
        }

// Search using different values of StringComparison. Specify the 
// start index. 
    Console.WriteLine("\nPart 2: Start index is specified.");
    foreach (StringComparison sc in scValues)
        {
        loc = cat.IndexOf(CapitalAWithRing, 0, sc);
        Console.WriteLine(resultFmt, sc, loc);
        }

// Search using different values of StringComparison. 
    Console.WriteLine("\nPart 3: Neither start index nor count is specified.");
    foreach (StringComparison sc in scValues)
        {
        loc = cat.IndexOf(CapitalAWithRing, sc);
        Console.WriteLine(resultFmt, sc, loc);
        }
    }
}

/*
Note: This code example was executed on a console whose user interface 
culture is "en-US" (English-United States).

This code example produces the following results:

Find the first occurrence of a character using different values of StringComparison.
The current culture is "en-US" - English (United States).
Search for the string "Å" in the string "A Cheshire ca°t"

Part 1: Start index and count are specified.
Comparison: CurrentCulture               Location:  -1
Comparison: CurrentCultureIgnoreCase     Location:  12
Comparison: InvariantCulture             Location:  -1
Comparison: InvariantCultureIgnoreCase   Location:  12
Comparison: Ordinal                      Location:  -1
Comparison: OrdinalIgnoreCase            Location:  -1

Part 2: Start index is specified.
Comparison: CurrentCulture               Location:  -1
Comparison: CurrentCultureIgnoreCase     Location:  12
Comparison: InvariantCulture             Location:  -1
Comparison: InvariantCultureIgnoreCase   Location:  12
Comparison: Ordinal                      Location:  -1
Comparison: OrdinalIgnoreCase            Location:  -1

Part 3: Neither start index nor count is specified.
Comparison: CurrentCulture               Location:  -1
Comparison: CurrentCultureIgnoreCase     Location:  12
Comparison: InvariantCulture             Location:  -1
Comparison: InvariantCultureIgnoreCase   Location:  12
Comparison: Ordinal                      Location:  -1
Comparison: OrdinalIgnoreCase            Location:  -1

*/
' This code example demonstrates the 
' System.String.IndexOf(String, ..., StringComparison) methods.

Imports System.Threading
Imports System.Globalization

Class Sample
    Public Shared Sub Main() 
        Dim intro As String = "Find the first occurrence of a character using different " & _
                              "values of StringComparison."
        Dim resultFmt As String = "Comparison: {0,-28} Location: {1,3}"
        
        ' Define a string to search for.
        ' U+00c5 = LATIN CAPITAL LETTER A WITH RING ABOVE
        Dim CapitalAWithRing As String = "Å"
        
        ' Define a string to search. 
        ' The result of combining the characters LATIN SMALL LETTER A and COMBINING 
        ' RING ABOVE (U+0061, U+030a) is linguistically equivalent to the character 
        ' LATIN SMALL LETTER A WITH RING ABOVE (U+00e5).
        Dim cat As String = "A Cheshire c" & "å" & "t"
        
        Dim loc As Integer = 0
        Dim scValues As StringComparison() =  { _
                        StringComparison.CurrentCulture, _
                        StringComparison.CurrentCultureIgnoreCase, _
                        StringComparison.InvariantCulture, _
                        StringComparison.InvariantCultureIgnoreCase, _
                        StringComparison.Ordinal, _
                        StringComparison.OrdinalIgnoreCase }
        Dim sc As StringComparison
        
        ' Clear the screen and display an introduction.
        Console.Clear()
        Console.WriteLine(intro)
        
        ' Display the current culture because culture affects the result. For example, 
        ' try this code example with the "sv-SE" (Swedish-Sweden) culture.
        Thread.CurrentThread.CurrentCulture = New CultureInfo("en-US")
        Console.WriteLine("The current culture is ""{0}"" - {1}.", _
                           Thread.CurrentThread.CurrentCulture.Name, _ 
                           Thread.CurrentThread.CurrentCulture.DisplayName)
        
        ' Display the string to search for and the string to search.
        Console.WriteLine("Search for the string ""{0}"" in the string ""{1}""", _
                           CapitalAWithRing, cat)
        Console.WriteLine()
        
        ' Note that in each of the following searches, we look for 
        ' LATIN CAPITAL LETTER A WITH RING ABOVE in a string that contains 
        ' LATIN SMALL LETTER A WITH RING ABOVE. A result value of -1 indicates 
        ' the string was not found.
        ' Search using different values of StringComparison. Specify the start 
        ' index and count.

        Console.WriteLine("Part 1: Start index and count are specified.")
        For Each sc In  scValues
            loc = cat.IndexOf(CapitalAWithRing, 0, cat.Length, sc)
            Console.WriteLine(resultFmt, sc, loc)
        Next sc
        
        ' Search using different values of StringComparison. Specify the 
        ' start index. 

        Console.WriteLine(vbCrLf & "Part 2: Start index is specified.")
        For Each sc In  scValues
            loc = cat.IndexOf(CapitalAWithRing, 0, sc)
            Console.WriteLine(resultFmt, sc, loc)
        Next sc
        
        ' Search using different values of StringComparison. 

        Console.WriteLine(vbCrLf & "Part 3: Neither start index nor count is specified.")
        For Each sc In  scValues
            loc = cat.IndexOf(CapitalAWithRing, sc)
            Console.WriteLine(resultFmt, sc, loc)
        Next sc
    
    End Sub
End Class

'
'Note: This code example was executed on a console whose user interface 
'culture is "en-US" (English-United States).
'
'This code example produces the following results:
'
'Find the first occurrence of a character using different values of StringComparison.
'The current culture is "en-US" - English (United States).
'Search for the string "Å" in the string "A Cheshire ca°t"
'
'Part 1: Start index and count are specified.
'Comparison: CurrentCulture               Location:  -1
'Comparison: CurrentCultureIgnoreCase     Location:  12
'Comparison: InvariantCulture             Location:  -1
'Comparison: InvariantCultureIgnoreCase   Location:  12
'Comparison: Ordinal                      Location:  -1
'Comparison: OrdinalIgnoreCase            Location:  -1
'
'Part 2: Start index is specified.
'Comparison: CurrentCulture               Location:  -1
'Comparison: CurrentCultureIgnoreCase     Location:  12
'Comparison: InvariantCulture             Location:  -1
'Comparison: InvariantCultureIgnoreCase   Location:  12
'Comparison: Ordinal                      Location:  -1
'Comparison: OrdinalIgnoreCase            Location:  -1
'
'Part 3: Neither start index nor count is specified.
'Comparison: CurrentCulture               Location:  -1
'Comparison: CurrentCultureIgnoreCase     Location:  12
'Comparison: InvariantCulture             Location:  -1
'Comparison: InvariantCultureIgnoreCase   Location:  12
'Comparison: Ordinal                      Location:  -1
'Comparison: OrdinalIgnoreCase            Location:  -1
'

Açıklamalar

Dizin numaralandırması sıfırdan başlar.Index numbering starts from zero.

comparisonTypeParametresi, value geçerli veya sabit kültür kullanılarak, büyük/küçük harfe duyarlı veya büyük/küçük harfe duyarsız bir arama kullanarak ve Word veya Ordinal karşılaştırma kurallarını kullanarak parametreyi aramak için belirtir.The comparisonType parameter specifies to search for the value parameter using the current or invariant culture, using a case-sensitive or case-insensitive search, and using word or ordinal comparison rules.

Arayanlara Notlar

Karakter kümeleri, dilbilimsel veya kültüre duyarlı bir karşılaştırma yapılırken dikkate alınmayan karakterler olan yok sayılabilir karakterler içerir.Character sets include ignorable characters, which are characters that are not considered when performing a linguistic or culture-sensitive comparison. Kültüre duyarlı bir aramada ( comparisonType Ordinal veya değilse OrdinalIgnoreCase ), yok value sayılamayan bir karakter içeriyorsa sonuç, bu karakter kaldırılmış şekilde aramaya eşdeğerdir.In a culture-sensitive search (that is, if comparisonType is not Ordinal or OrdinalIgnoreCase), if value contains an ignorable character, the result is equivalent to searching with that character removed. valueYalnızca bir veya daha fazla yoksayılabilir karakter içeriyorsa, IndexOf(String, StringComparison) Yöntem her zaman, eşleşmenin geçerli örneğin başlangıcında bulunduğunu belirtmek için 0 (sıfır) döndürür.If value consists only of one or more ignorable characters, the IndexOf(String, StringComparison) method always returns 0 (zero) to indicate that the match is found at the beginning of the current instance.

Aşağıdaki örnekte, IndexOf(String, StringComparison) yöntemi üç alt dizeyi (yumuşak bir tire (U + 00AD) bulmak için, yumuşak bir tire ve sonrasında "m" gelen yumuşak bir tire, sonra da "m" ile sonra "m") için kullanılır.In the following example, the IndexOf(String, StringComparison) 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. Dizelerin yalnızca birinde hece ayırma çizgisi var.Only one of the strings contains a soft hyphen. Örnek .NET Framework 4.NET Framework 4 veya sonraki bir sürümde çalışıyorsa, yumuşak tire yoksayılabilir bir karakter olduğundan, kültüre duyarlı bir arama, yavaş tire arama dizesine dahil edilmediğinde döndürdüğü değeri döndürür.If the example is run on the .NET Framework 4.NET Framework 4 or later, 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. Ancak sıralı arama, bir dizedeki yumuşak kısa çizgiyi başarıyla bulur ve ikinci dizeden eksik olduğunu bildirir.An ordinal search, however, successfully finds the soft hyphen in one string and reports that it is absent from the second string.

[! Code-CSharpSystem. String. IndexOf # 26] [! Code-vbSystem. String. IndexOf # 26][!code-csharpSystem.String.IndexOf#26] [!code-vbSystem.String.IndexOf#26]

Şunlara uygulanır

IndexOf(Char, StringComparison)

Bu dizedeki belirtilen Unicode karakterinin ilk oluşumunun sıfır tabanlı dizinini bildirir.Reports the zero-based index of the first occurrence of the specified Unicode character in this string. Bir parametre belirtilen karakter için kullanılacak arama türünü belirtir.A parameter specifies the type of search to use for the specified character.

public:
 int IndexOf(char value, StringComparison comparisonType);
public int IndexOf (char value, StringComparison comparisonType);
member this.IndexOf : char * StringComparison -> int
Public Function IndexOf (value As Char, comparisonType As StringComparison) As Integer

Parametreler

value
Char

Aranmaya yönelik karakter.The character to seek.

comparisonType
StringComparison

Arama kurallarını belirten bir numaralandırma değeri.An enumeration value that specifies the rules for the search.

Döndürülenler

Int32

valueBu karakter bulunursa, sıfır tabanlı dizin veya değilse-1.The zero-based index of value if that character is found, or -1 if it is not.

Özel durumlar

comparisonType geçerli bir değer değil StringComparison .comparisonType is not a valid StringComparison value.

Açıklamalar

Dizin numaralandırması sıfırdan başlar.Index numbering starts from zero.

comparisonTypeParametresi, StringComparison value bağımsız değişken için aramanın geçerli veya sabit kültür kullandığını, büyük/küçük harfe duyarlı veya büyük/küçük harfe duyarsız olduğunu veya Word veya Ordinal karşılaştırma kurallarını kullandığını belirten bir numaralandırma üyesidir.The comparisonType parameter is a StringComparison enumeration member that specifies whether the search for the value argument uses the current or invariant culture, is case-sensitive or case-insensitive, or uses word or ordinal comparison rules.

Şunlara uygulanır

IndexOf(Char, Int32)

Bu dizedeki belirtilen Unicode karakterinin ilk oluşumunun sıfır tabanlı dizinini bildirir.Reports the zero-based index of the first occurrence of the specified Unicode character in this string. Arama belirtilen bir karakter konumunda başlar.The search starts at a specified character position.

public:
 int IndexOf(char value, int startIndex);
public int IndexOf (char value, int startIndex);
member this.IndexOf : char * int -> int
Public Function IndexOf (value As Char, startIndex As Integer) As Integer

Parametreler

value
Char

Aranacak Unicode karakteri.A Unicode character to seek.

startIndex
Int32

Arama başlama konumu.The search starting position.

Döndürülenler

Int32

valueBu karakter bulunursa dizenin başından itibaren sıfır tabanlı dizin konumu veya değilse-1.The zero-based index position of value from the start of the string if that character is found, or -1 if it is not.

Özel durumlar

startIndex 0 ' dan (sıfır) veya dizenin uzunluğundan daha büyük.startIndex is less than 0 (zero) or greater than the length of the string.

Örnekler

Aşağıdaki örnek IndexOf yöntemini gösterir.The following example demonstrates the IndexOf method.

// Sample for String::IndexOf(Char, Int32)
using namespace System;
int main()
{
   String^ br1 = "0----+----1----+----2----+----3----+----4----+----5----+----6----+-";
   String^ br2 = "0123456789012345678901234567890123456789012345678901234567890123456";
   String^ str = "Now is the time for all good men to come to the aid of their party.";
   int start;
   int at;
   Console::WriteLine();
   Console::WriteLine( "All occurrences of 't' from position 0 to {0}.", str->Length - 1 );
   Console::WriteLine( "{1}{0}{2}{0}{3}{0}", Environment::NewLine, br1, br2, str );
   Console::Write( "The letter 't' occurs at position(s): " );
   at = 0;
   start = 0;
   while ( (start < str->Length) && (at > -1) )
   {
      at = str->IndexOf( 't', start );
      if ( at == -1 )
            break;

      Console::Write( "{0} ", at );
      start = at + 1;
   }

   Console::WriteLine();
}

/*
This example produces the following results:

All occurrences of 't' from position 0 to 66.
0----+----1----+----2----+----3----+----4----+----5----+----6----+-
0123456789012345678901234567890123456789012345678901234567890123456
Now is the time for all good men to come to the aid of their party.

The letter 't' occurs at position(s): 7 11 33 41 44 55 64

*/
string br1 = "0----+----1----+----2----+----3----+----4----+----5----+----6----+---";
string br2 = "012345678901234567890123456789012345678901234567890123456789012345678";
string str = "Now is the time for all good men to come to the aid of their country.";
int start;
int at;

Console.WriteLine();
Console.WriteLine("All occurrences of 't' from position 0 to {0}.", str.Length-1);
Console.WriteLine("{1}{0}{2}{0}{3}{0}", Environment.NewLine, br1, br2, str);
Console.Write("The letter 't' occurs at position(s): ");

at = 0;
start = 0;
while((start < str.Length) && (at > -1))
{
    at = str.IndexOf('t', start);
    if (at == -1) break;
    Console.Write("{0} ", at);
    start = at+1;
}
Console.WriteLine();

/*
This example produces the following results:

All occurrences of 't' from position 0 to 68.
0----+----1----+----2----+----3----+----4----+----5----+----6----+---
012345678901234567890123456789012345678901234567890123456789012345678
Now is the time for all good men to come to the aid of their country.

The letter 't' occurs at position(s): 7 11 33 41 44 55 65

*/
' Sample for String.IndexOf(Char, Int32)

Module Sample
    Sub Main()

        Dim br1 As String = "0----+----1----+----2----+----3----+----4----+----5----+----6----+-"
        Dim br2 As String = "0123456789012345678901234567890123456789012345678901234567890123456"
        Dim str As String = "Now is the time for all good men to come to the aid of their party."
        Dim start As Integer
        Dim at As Integer

        Console.WriteLine()
        Console.WriteLine("All occurrences of 't' from position 0 to {0}.", str.Length - 1)
        Console.WriteLine("{1}{0}{2}{0}{3}{0}", Environment.NewLine, br1, br2, str)
        Console.Write("The letter 't' occurs at position(s): ")

        at = 0
        start = 0
        While start < str.Length AndAlso at > -1
            at = str.IndexOf("t"c, start)
            If at = -1 Then
                Exit While
            End If
            Console.Write("{0} ", at)
            start = at + 1
        End While
        Console.WriteLine()
    End Sub
End Module
'
'This example produces the following results:
'
'All occurrences of 't' from position 0 to 66.
'0----+----1----+----2----+----3----+----4----+----5----+----6----+-
'0123456789012345678901234567890123456789012345678901234567890123456
'Now is the time for all good men to come to the aid of their party.
'
'The letter 't' occurs at position(s): 7 11 33 41 44 55 64
'
'

Açıklamalar

Dizin numaralandırması 0 ' dan başlar.Index numbering starts from 0. startIndexParametresi, 0 ile dize örneğinin uzunluğuna kadar değişebilir.The startIndex parameter can range from 0 to the length of the string instance. startIndexDize örneğinin uzunluğuna eşitse, Yöntem-1 döndürür.If startIndex equals the length of the string instance, the method returns -1.

Arama, startIndex dizenin sonuna kadar aralığındadır.The search ranges from startIndex to the end of the string.

Bu yöntem, yalnızca kendi Unicode skalar değerleri aynıysa, bir karakterin başka bir karaktere eşit kabul edildiği bir sıra (kültür duyarlı olmayan) araması gerçekleştirir.This method performs an ordinal (culture-insensitive) search, where a character is considered equivalent to another character only if their Unicode scalar values are the same. Kültüre duyarlı arama gerçekleştirmek için, CompareInfo.IndexOf "Æ" (u + 00C6) gibi önceden oluşturulmuş bir karakteri temsil eden bir Unicode skaler değeri, kültüre bağlı olarak, "AE" (u + 0041, u + 0045) gibi, bir karakter bileşeninin doğru sırada herhangi bir oluşumuna eşdeğer olarak düşünülebilir.To perform a culture-sensitive search, use the CompareInfo.IndexOf method, where a Unicode scalar 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.

Ayrıca bkz.

Şunlara uygulanır

IndexOf(String)

Bu örnekteki belirtilen dizenin ilk oluşumunun sıfır tabanlı dizinini bildirir.Reports the zero-based index of the first occurrence of the specified string in this instance.

public:
 int IndexOf(System::String ^ value);
public int IndexOf (string value);
member this.IndexOf : string -> int
Public Function IndexOf (value As String) As Integer

Parametreler

value
String

Aranacak dize.The string to seek.

Döndürülenler

Int32

Bu dize bulunursa öğesinin sıfır tabanlı dizin konumu value veya yoksa-1.The zero-based index position of value if that string is found, or -1 if it is not. valueİse Empty , dönüş değeri 0 ' dır.If value is Empty, the return value is 0.

Özel durumlar

value, null değeridir.value is null.

Örnekler

Aşağıdaki örnek "anhayvan" içinde "n" öğesini arar.The following example searches for the "n" in "animal". Dize dizinleri, bir yerine sıfır ile başlayacağı için yöntemi, IndexOf(String) "n" ın 1. konumda olduğunu gösterir.Because string indexes begin at zero rather than one, the IndexOf(String) method indicates that the "n" is at position 1.

using namespace System;

void main()
{
   String^ str = "animal";
   String^ toFind = "n";
   int index = str->IndexOf("n");
   Console::WriteLine("Found '{0}' in '{1}' at position {2}",
                        toFind, str, index);

}
// The example displays the following output:
//        Found 'n' in 'animal' at position 1
String str = "animal";
String toFind = "n";
int index = str.IndexOf("n");
Console.WriteLine("Found '{0}' in '{1}' at position {2}",
                toFind, str, index);

// The example displays the following output:
//        Found 'n' in 'animal' at position 1
Public Module Example
   Public Sub Main()
      Dim str As String = "animal"
      Dim toFind As String = "n"
      Dim index As Integer = str.IndexOf("n")
      Console.WriteLine("Found '{0}' in '{1}' at position {2}",
                        toFind, str, index)
   End Sub
End Module
' The example displays the following output:
'       Found 'n' in 'animal' at position 1

Aşağıdaki örnek, IndexOf bir tümcedeki bir hayvan adının başlangıç konumunu tespit etmek için yöntemini kullanır.The following example uses the IndexOf method to determine the starting position of an animal name in a sentence. Daha sonra bu konumu kullanarak tümceyi açıklayan bir sıfatıcı ekler.It then uses this position to insert an adjective that describes the animal into the sentence.

using namespace System;

int main()
{
   String^ animal1 = "fox";
   String^ animal2 = "dog";
   String^ strTarget = String::Format( "The {0} jumps over the {1}.", animal1, animal2 );
   Console::WriteLine( "The original string is:{0}{1}{0}", Environment::NewLine, strTarget );
   Console::Write( "Enter an adjective (or group of adjectives) to describe the {0}: ==> ", animal1 );
   String^ adj1 = Console::ReadLine();
   Console::Write( "Enter an adjective (or group of adjectives) to describe the {0}: ==> ", animal2 );
   String^ adj2 = Console::ReadLine();
   adj1 = String::Concat( adj1->Trim(), " " );
   adj2 = String::Concat( adj2->Trim(), " " );
   strTarget = strTarget->Insert( strTarget->IndexOf( animal1 ), adj1 );
   strTarget = strTarget->Insert( strTarget->IndexOf( animal2 ), adj2 );
   Console::WriteLine( " {0}The final string is: {0} {1}", Environment::NewLine, strTarget );
}
// Output from the example might appear as follows:
//       The original string is:
//       The fox jumps over the dog.
//       
//       Enter an adjective (or group of adjectives) to describe the fox: ==> bold
//       Enter an adjective (or group of adjectives) to describe the dog: ==> lazy
//       
//       The final string is:
//       The bold fox jumps over the lazy dog.
using System;

public class Example {
    public static void Main()
    {
        string animal1 = "fox";
        string animal2 = "dog";

        string strTarget = String.Format("The {0} jumps over the {1}.",
                                         animal1, animal2);

        Console.WriteLine("The original string is:{0}{1}{0}",
                          Environment.NewLine, strTarget);

        Console.Write("Enter an adjective (or group of adjectives) " +
                      "to describe the {0}: ==> ", animal1);
        string adj1 = Console.ReadLine();

        Console.Write("Enter an adjective (or group of adjectives) " +
                      "to describe the {0}: ==> ", animal2);
        string adj2 = Console.ReadLine();

        adj1 = adj1.Trim() + " ";
        adj2 = adj2.Trim() + " ";

        strTarget = strTarget.Insert(strTarget.IndexOf(animal1), adj1);
        strTarget = strTarget.Insert(strTarget.IndexOf(animal2), adj2);

        Console.WriteLine("{0}The final string is:{0}{1}",
                          Environment.NewLine, strTarget);
    }
}
// Output from the example might appear as follows:
//       The original string is:
//       The fox jumps over the dog.
//
//       Enter an adjective (or group of adjectives) to describe the fox: ==> bold
//       Enter an adjective (or group of adjectives) to describe the dog: ==> lazy
//
//       The final string is:
//       The bold fox jumps over the lazy dog.
Public Class Example
    Public Shared Sub Main()
        Dim animal1 As String = "fox"
        Dim animal2 As String = "dog"
        Dim strTarget As String = String.Format("The {0} jumps over the {1}.", 
                                                animal1, animal2)
        
        Console.WriteLine("The original string is: {0}{1}{0}", 
                          Environment.NewLine, strTarget)
        
        Console.Write("Enter an adjective (or group of adjectives) " +
                      "to describe the {0}: ==> ", animal1)
        Dim adj1 As String = Console.ReadLine()
        
        Console.Write("Enter an adjective (or group of adjectives) " + 
                      "to describe the {0}: ==> ", animal2)
        Dim adj2 As String = Console.ReadLine()
        
        adj1 = adj1.Trim() + " "
        adj2 = adj2.Trim() + " "
        
        strTarget = strTarget.Insert(strTarget.IndexOf(animal1), adj1)
        strTarget = strTarget.Insert(strTarget.IndexOf(animal2), adj2)
        
        Console.WriteLine("{0}The final string is:{0}{1}", 
                          Environment.NewLine, strTarget)
    End Sub 
End Class 
' Output from the example might appear as follows:
'       The original string is:
'       The fox jumps over the dog.
'       
'       Enter an adjective (or group of adjectives) to describe the fox: ==> bold
'       Enter an adjective (or group of adjectives) to describe the dog: ==> lazy
'       
'       The final string is:
'       The bold fox jumps over the lazy dog.

Açıklamalar

Dizin numaralandırması sıfırdan başlar.Index numbering starts from zero.

Bu yöntem, geçerli kültür kullanılarak bir sözcük (büyük/küçük harfe ve kültüre duyarlı) araması gerçekleştirir.This method performs a word (case-sensitive and culture-sensitive) search using the current culture. Arama, bu örneğin ilk karakter konumunda başlar ve son karakter konumuna kadar devam eder.The search begins at the first character position of this instance and continues until the last character position.

Karakter kümeleri, dilbilimsel veya kültüre duyarlı bir karşılaştırma yapılırken dikkate alınmayan karakterler olan yok sayılabilir karakterler içerir.Character sets include ignorable characters, which are characters that are not considered when performing a linguistic or culture-sensitive comparison. Kültüre duyarlı aramada, yok value sayılamayan bir karakter içeriyorsa sonuç, bu karakteri kaldırılmış şekilde aramayla eşdeğerdir.In a culture-sensitive search, if value contains an ignorable character, the result is equivalent to searching with that character removed. valueYalnızca bir veya daha fazla yoksayılabilir karakter içeriyorsa, IndexOf(String) Yöntem her zaman, eşleşmenin geçerli örneğin başlangıcında bulunduğunu belirtmek için 0 (sıfır) döndürür.If value consists only of one or more ignorable characters, the IndexOf(String) method always returns 0 (zero) to indicate that the match is found at the beginning of the current instance. Aşağıdaki örnekte, IndexOf(String) yöntemi üç alt dizeyi (yumuşak bir tire (U + 00AD) bulmak için, yumuşak bir tire ve sonrasında "m" gelen yumuşak bir tire, sonra da "m" ile sonra "m") için kullanılır.In the following example, the IndexOf(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. Dizelerin yalnızca birinde hece ayırma çizgisi var.Only one of the strings contains a soft hyphen. Örnek, .NET Framework 4.NET Framework 4 veya sonraki sürümlerde çalıştırılsa, her durumda, yumuşak tire yoksayılabilir bir karakter olduğundan, sonuç, bu, yumuşak tireyle dahil edilmemelidir value .If the example is run on the .NET Framework 4.NET Framework 4 or later, 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. Yalnızca bir yumuşak tire ararken, yöntem, dizenin başlangıcında bir eşleşme buldığını göstermek için 0 (sıfır) döndürür.When searching for a soft hyphen only, the method returns 0 (zero) to indicate that it has found a match at the beginning of the string.

using System;

public class Example
{
    public static void Main()
    {
        string s1 = "ani\u00ADmal";
        string s2 = "animal";
      
        // Find the index of the soft hyphen.
        Console.WriteLine(s1.IndexOf("\u00AD"));
        Console.WriteLine(s2.IndexOf("\u00AD"));
      
        // Find the index of the soft hyphen followed by "n".
        Console.WriteLine(s1.IndexOf("\u00ADn"));
        Console.WriteLine(s2.IndexOf("\u00ADn"));
      
        // Find the index of the soft hyphen followed by "m".
        Console.WriteLine(s1.IndexOf("\u00ADm"));
        Console.WriteLine(s2.IndexOf("\u00ADm"));

        // The example displays the following output
        // if run under the .NET Framework 4 or later:
        //       0
        //       0
        //       1
        //       1
        //       4
        //       3
    }
}
Module Example
   Public Sub Main()
      Dim softHyphen As String = ChrW(&h00AD)
      Dim s1 As String = "ani" + softHyphen + "mal"
      Dim s2 As String = "animal"
      
      ' Find the index of the soft hyphen.
      Console.WriteLine(s1.IndexOf(softHyphen))
      Console.WriteLine(s2.IndexOf(softHyphen))
      
      ' Find the index of the soft hyphen followed by "n".
      Console.WriteLine(s1.IndexOf(softHyphen + "n"))
      Console.WriteLine(s2.IndexOf(softHyphen + "n"))
      
      ' Find the index of the soft hyphen followed by "m".
      Console.WriteLine(s1.IndexOf(softHyphen + "m"))
      Console.WriteLine(s2.IndexOf(softHyphen + "m"))
   End Sub
End Module
' The example displays the following output 
' if run under the .NET Framework 4 or later:
'       0
'       0
'       1
'       1
'       4
'       3

Arayanlara Notlar

Dizeleri kullanmak Için En Iyi Yöntemlerbölümünde açıklandığı gibi, varsayılan değerlerin yerine geçecek dize karşılaştırma yöntemlerinden kaçının ve bunun yerine parametrelerin açıkça belirtilmesini gerektiren yöntemleri çağırın.As explained in Best Practices for Using Strings, we recommend that you avoid calling string comparison methods that substitute default values and instead call methods that require parameters to be explicitly specified. Geçerli kültürün karşılaştırma kurallarını kullanarak bir dize örneği içindeki bir alt dizenin ilk dizinini bulmak için, IndexOf(String, StringComparison) metodu için bir değer olan yöntem aşırı yüklemesini çağırın CurrentCulture comparisonType .To find the first index of a substring within a string instance by using the comparison rules of the current culture, call the IndexOf(String, StringComparison) method overload with a value of CurrentCulture for its comparisonType parameter.

Ayrıca bkz.

Şunlara uygulanır

IndexOf(Char)

Bu dizedeki belirtilen Unicode karakterinin ilk oluşumunun sıfır tabanlı dizinini bildirir.Reports the zero-based index of the first occurrence of the specified Unicode character in this string.

public:
 int IndexOf(char value);
public int IndexOf (char value);
member this.IndexOf : char -> int
Public Function IndexOf (value As Char) As Integer

Parametreler

value
Char

Aranacak Unicode karakteri.A Unicode character to seek.

Döndürülenler

Int32

Bu karakter bulunursa öğesinin sıfır tabanlı dizin konumu value veya yoksa-1.The zero-based index position of value if that character is found, or -1 if it is not.

Örnekler

Aşağıdaki örnek, yöntemini kullanarak bir karakter için nasıl arama yapılacağını gösterir String IndexOf .The following example demonstrates how you can search a String for a character using the IndexOf method.

using namespace System;

void main()
{
   // Create a Unicode String with 5 Greek Alpha characters.
   String^ szGreekAlpha = gcnew String(L'\x0391',5);

   // Create a Unicode String with a 3 Greek Omega characters.
   String^ szGreekOmega = L"\x03A9\x03A9\x03A9";

   String^ szGreekLetters = String::Concat(szGreekOmega, szGreekAlpha, 
                                           szGreekOmega->Clone());

   // Display the entire string.
   Console::WriteLine(szGreekLetters);

   // The first index of Alpha.
   int ialpha = szGreekLetters->IndexOf( L'\x0391');
   // The first index of Omega.
   int iomega = szGreekLetters->IndexOf(L'\x03A9');

   Console::WriteLine("First occurrence of the Greek letter Alpha: Index {0}", 
                      ialpha);
   Console::WriteLine("First occurrence of the Greek letter Omega: Index {0}", 
                      iomega);
}
// The example displays the following output:
//       The string: OOO?????OOO
//       First occurrence of the Greek letter Alpha: Index 3
//       First occurrence of the Greek letter Omega: Index 0
// Create a Unicode string with 5 Greek Alpha characters.
String szGreekAlpha = new String('\u0391',5);

// Create a Unicode string with 3 Greek Omega characters.
String szGreekOmega = "\u03A9\u03A9\u03A9";

String szGreekLetters = String.Concat(szGreekOmega, szGreekAlpha, 
                                    szGreekOmega.Clone());

// Display the entire string.
Console.WriteLine("The string: {0}", szGreekLetters);

// The first index of Alpha.
int ialpha = szGreekLetters.IndexOf('\u0391');
// The first index of Omega.
int iomega = szGreekLetters.IndexOf('\u03A9');

Console.WriteLine("First occurrence of the Greek letter Alpha: Index {0}", 
                ialpha);
Console.WriteLine("First occurrence of the Greek letter Omega: Index {0}", 
                iomega);

// The example displays the following output:
//    The string: ΩΩΩΑΑΑΑΑΩΩΩ
//    First occurrence of the Greek letter Alpha: Index 3
//    First occurrence of the Greek letter Omega: Index 0
Public Module Example
   Public Sub Main()
      ' Create a Unicode string with 5 Greek Alpha characters.
      Dim szGreekAlpha As New String(ChrW(&H0391), 5)

      ' Create a Unicode string with 3 Greek Omega characters.
      Dim szGreekOmega As String = ChrW(&H03A9) + ChrW(&H03A9)+
                                   ChrW(&H03A9)

      Dim szGreekLetters As String = String.Concat(szGreekOmega, szGreekAlpha, _
                                                   szGreekOmega.Clone())

      ' Display the entire string.
      Console.WriteLine(szGreekLetters)

      ' The first index of Alpha.
      Dim iAlpha As Integer = szGreekLetters.IndexOf(ChrW(&H0391))
      ' The first index of Omega.
      Dim iomega As Integer = szGreekLetters.IndexOf(ChrW(&H03A9))

      Console.WriteLine("First occurrence of the Greek letter Alpha: Index {0}", 
                        ialpha)
      Console.WriteLine("First occurrence of the Greek letter Omega: Index {0}", 
                        iomega)
   End Sub
End Module
' The example displays the following output:
'       The string: OOO?????OOO
'       First occurrence of the Greek letter Alpha: Index 3
'       First occurrence of the Greek letter Omega: Index 0

Açıklamalar

Dizin numaralandırması sıfırdan başlar.Index numbering starts from zero.

Bu yöntem, yalnızca kendi Unicode skalar değerleri aynıysa, bir karakterin başka bir karaktere eşit kabul edildiği bir sıra (kültür duyarlı olmayan) araması gerçekleştirir.This method performs an ordinal (culture-insensitive) search, where a character is considered equivalent to another character only if their Unicode scalar values are the same. Kültüre duyarlı arama gerçekleştirmek için, CompareInfo.IndexOf "Æ" (u + 00C6) gibi önceden oluşturulmuş bir karakteri temsil eden bir Unicode skaler değeri, kültüre bağlı olarak, "AE" (u + 0041, u + 0045) gibi, bir karakter bileşeninin doğru sırada herhangi bir oluşumuna eşdeğer olarak düşünülebilir.To perform a culture-sensitive search, use the CompareInfo.IndexOf method, where a Unicode scalar 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.

Ayrıca bkz.

Şunlara uygulanır

IndexOf(String, Int32)

Bu örnekteki belirtilen dizenin ilk oluşumunun sıfır tabanlı dizinini bildirir.Reports the zero-based index of the first occurrence of the specified string in this instance. Arama belirtilen bir karakter konumunda başlar.The search starts at a specified character position.

public:
 int IndexOf(System::String ^ value, int startIndex);
public int IndexOf (string value, int startIndex);
member this.IndexOf : string * int -> int
Public Function IndexOf (value As String, startIndex As Integer) As Integer

Parametreler

value
String

Aranacak dize.The string to seek.

startIndex
Int32

Arama başlama konumu.The search starting position.

Döndürülenler

Int32

valueBu dize bulunursa geçerli örneğin başından itibaren sıfır tabanlı dizin konumu veya değilse-1.The zero-based index position of value from the start of the current instance if that string is found, or -1 if it is not. valueİse Empty , dönüş değeri olur startIndex .If value is Empty, the return value is startIndex.

Özel durumlar

value, null değeridir.value is null.

startIndex 0 ' dan (sıfır) veya bu dizenin uzunluğundan daha büyük.startIndex is less than 0 (zero) or greater than the length of this string.

Örnekler

Aşağıdaki örnek, bir hedef dize içinde belirtilen bir dizenin tüm oluşumlarını arar.The following example searches for all occurrences of a specified string within a target string.

using namespace System;
int main()
{
   String^ strSource = "This is the string which we will perform the search on";
   Console::WriteLine( "The search string is: {0}\"{1}\" {0}", Environment::NewLine, strSource );
   String^ strTarget = "";
   int found = 0;
   int totFinds = 0;
   do
   {
      Console::Write( "Please enter a search value to look for in the above string (hit Enter to exit) ==> " );
      strTarget = Console::ReadLine();
      if (  !strTarget->Equals( "" ) )
      {
         for ( int i = 0; i < strSource->Length; i++ )
         {
            found = strSource->IndexOf( strTarget, i );
            if (found >= 0)
            {
               totFinds++;
               i = found;
            }
            else
               break;

         }
      }
      else
            return 0;
      Console::WriteLine( "{0}The search parameter '{1}' was found {2} times. {0}", Environment::NewLine, strTarget, totFinds );
      totFinds = 0;
   }
   while ( true );
}

using System;

public class IndexOfTest {
    public static void Main() {

        string strSource = "This is the string which we will perform the search on";

        Console.WriteLine("The search string is:{0}\"{1}\"{0}", Environment.NewLine, strSource);

        string strTarget = "";
        int found = 0;
        int totFinds = 0;

        do {
            Console.Write("Please enter a search value to look for in the above string (hit Enter to exit) ==> ");

            strTarget = Console.ReadLine();

            if (strTarget != "") {

                for (int i = 0; i < strSource.Length; i++) {

                    found = strSource.IndexOf(strTarget, i);

                    if (found >= 0) {
                        totFinds++;
                        i = found;
                    }
                    else
                    {
                        break;
                    }
                }
            }
            else
            {
                return;
            }

            Console.WriteLine("{0}The search parameter '{1}' was found {2} times.{0}",
                    Environment.NewLine, strTarget, totFinds);

            totFinds = 0;
        } while ( true );
    }
}
Public Class IndexOfTest
    
    Public Shared Sub Main()
        Dim strSource As String = "This is the string which we will perform the search on"
        
        Console.WriteLine("The search string is:{0}{1}{0}", Environment.NewLine, strSource)
        Dim strTarget As String = ""
        Dim found As Integer = 0
        Dim totFinds As Integer = 0
        
        Do
            Console.Write("Please enter a search value to look for in the above string (hit Enter to exit) ==> ")
            
            strTarget = Console.ReadLine()
            If strTarget <> "" Then
                Dim i As Integer
                
                
                For i = 0 To strSource.Length - 1
                    
                    found = strSource.IndexOf(strTarget, i)
                    If found >= 0 Then
                        
                        totFinds += 1
                        i = found
                    Else
                        Exit For
                    End If
                Next i
            Else
                Return
            
            End If
            Console.WriteLine("{0}The search parameter '{1}' was found {2} times.{0}", Environment.NewLine, strTarget, totFinds)
            
            totFinds = 0
        
        Loop While True
    End Sub
End Class

Açıklamalar

Dizin numaralandırması 0 ' dan başlar.Index numbering starts from 0. startIndexParametresi, 0 ile dize örneğinin uzunluğuna kadar değişebilir.The startIndex parameter can range from 0 to the length of the string instance. startIndexDize örneğinin uzunluğuna eşitse, Yöntem-1 döndürür.If startIndex equals the length of the string instance, the method returns -1.

Bu yöntem, geçerli kültür kullanılarak bir sözcük (büyük/küçük harfe ve kültüre duyarlı) araması gerçekleştirir.This method performs a word (case-sensitive and culture-sensitive) search using the current culture. Arama, startIndex Bu örneğin karakter konumunda başlar ve son karakter konumuna kadar devam eder.The search begins at the startIndex character position of this instance and continues until the last character position.

Karakter kümeleri, dilbilimsel veya kültüre duyarlı bir karşılaştırma yapılırken dikkate alınmayan karakterler olan yok sayılabilir karakterler içerir.Character sets include ignorable characters, which are characters that are not considered when performing a linguistic or culture-sensitive comparison. Kültüre duyarlı aramada, yok value sayılamayan bir karakter içeriyorsa sonuç, bu karakteri kaldırılmış şekilde aramayla eşdeğerdir.In a culture-sensitive search, if value contains an ignorable character, the result is equivalent to searching with that character removed. valueYalnızca bir veya daha fazla yoksayılabilir karakter içeriyorsa, yöntem, IndexOf(String, Int32) startIndex aramanın başladığı karakter konumu olan her zaman döndürülür.If value consists only of one or more ignorable characters, the IndexOf(String, Int32) method always returns startIndex, which is the character position at which the search begins. Aşağıdaki örnekte, IndexOf(String, Int32) yöntemi iki dize içinde bir "m" gelen yumuşak tire (U + 00AD) konumunu bulmak için kullanılır.In the following example, the IndexOf(String, Int32) method is used to find the position of a soft hyphen (U+00AD) followed by an "m" in two strings. Dizelerin yalnızca birinde gereken alt dize var.Only one of the strings contains the required substring. Örnek, .NET Framework 4.NET Framework 4 veya sonraki sürümlerde çalışıyorsa, her iki durumda da, yumuşak tire yoksayılabilir bir karakter olduğundan, yöntemi dizedeki "d" dizinini döndürür.If the example is run on the .NET Framework 4.NET Framework 4 or later, in both cases, because the soft hyphen is an ignorable character, the method returns the index of "m" in the string. Hece ayırma çizgisi ve ardından "m" harfinin geldiği ilk dize söz konusu olduğunda, yöntemin hece ayırma çizgisinin dizinini döndüremediğine ancak onun yerine "m" harfinin dizinini döndürdüğüne dikkat edin.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".

using System;

public class Example
{
    public static void Main()
    {
        string searchString = "\u00ADm";
        string s1 = "ani\u00ADmal" ;
        string s2 = "animal";

        Console.WriteLine(s1.IndexOf(searchString, 2));
        Console.WriteLine(s2.IndexOf(searchString, 2));

        // The example displays the following output:
        //       4
        //       3
    }
}
Module Example
   Public Sub Main()
      Dim searchString As String = Chrw(&h00AD) + "m"
      Dim s1 As String = "ani" + ChrW(&h00AD) + "mal"
      Dim s2 As String = "animal"

      Console.WriteLine(s1.IndexOf(searchString, 2))
      Console.WriteLine(s2.IndexOf(searchString, 2))
   End Sub
End Module
' The example displays the following output:
'       4
'       3 

Arayanlara Notlar

Dizeleri kullanmak Için En Iyi Yöntemlerbölümünde açıklandığı gibi, varsayılan değerlerin yerine geçecek dize karşılaştırma yöntemlerinden kaçının ve bunun yerine parametrelerin açıkça belirtilmesini gerektiren yöntemleri çağırın.As explained in Best Practices for Using Strings, we recommend that you avoid calling string comparison methods that substitute default values and instead call methods that require parameters to be explicitly specified. Geçerli kültürün karşılaştırma kurallarını kullanarak belirli bir karakter konumundan sonra gelen bir alt dizenin ilk dizinini bulmak için, IndexOf(String, Int32, StringComparison) yönteminin bir değeriyle birlikte yöntem aşırı yüklemesini çağırın CurrentCulture comparisonType .To find the first index of a substring that occurs after a particular character position by using the comparison rules of the current culture, call the IndexOf(String, Int32, StringComparison) method overload with a value of CurrentCulture for its comparisonType parameter.

Ayrıca bkz.

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