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String::IndexOfAny Method (array<Char>, Int32, Int32)

Reports the zero-based index of the first occurrence in this instance of any character in a specified array of Unicode characters. The search starts at a specified character position and examines a specified number of character positions.

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

int IndexOfAny(
	array<wchar_t>^ anyOf, 
	int startIndex, 
	int count


Type: array<System::Char>

A Unicode character array containing one or more characters to seek.

Type: System::Int32

The search starting position.

Type: System::Int32

The number of character positions to examine.

Return Value

Type: System::Int32
The zero-based index position of the first occurrence in this instance where any character in anyOf was found; -1 if no character in anyOf was found.


anyOf is nullptr.


count or startIndex is negative.


count + startIndex is greater than the number of characters in this instance.

The search begins at startIndex and continues to startIndex + count -1. The character at startIndex + count is not included in the search.

Index numbering starts from zero. The startIndex parameter can range from 0 to one less than the length of the string instance.

The search for anyOf is case-sensitive.

This method performs an ordinal (culture-insensitive) search, where a character is considered equivalent to another character only if their Unicode scalar value are the same. 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.

The following example finds the index of the occurrence of any character of the string "aid" within a substring of another string.

// Sample for String::IndexOfAny(Char[], 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 count;
   String^ target = "aid";
   array<Char>^anyOf = target->ToCharArray();
   start = (str->Length - 1) / 3;
   count = (str->Length - 1) / 4;
   Console::WriteLine( "The first character occurrence from position {0} for {1} characters.", start, count );
   Console::WriteLine( "{1}{0}{2}{0}{3}{0}", Environment::NewLine, br1, br2, str );
   Console::Write( "A character in '{0}' occurs at position: ", target );
   at = str->IndexOfAny( anyOf, start, count );
   if ( at > -1 )
      Console::Write( at );
      Console::Write( "(not found)" );



The first character occurrence from position 22 for 16 characters.
Now is the time for all good men to come to the aid of their party.

A character in 'aid' occurs at position: 27


.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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