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String.IndexOfAny Method (Char[], Int32, Int32)

Reports the 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)

public int IndexOfAny (
	char[] anyOf,
	int startIndex,
	int count
)
public int IndexOfAny (
	char[] anyOf, 
	int startIndex, 
	int count
)
public function IndexOfAny (
	anyOf : char[], 
	startIndex : int, 
	count : int
) : int
Not applicable.

Parameters

anyOf

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

startIndex

The search starting position.

count

The number of character positions to examine.

Return Value

The index position of the first occurrence in this instance where any character in anyOf was found; otherwise, -1 if no character in anyOf was found.

Exception typeCondition

ArgumentNullException

anyOf is a null reference (Nothing in Visual Basic).

ArgumentOutOfRangeException

count or startIndex is negative.

-or-

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 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 code 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 System;

class Sample {
    public static void 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";
    char[] anyOf = target.ToCharArray();

    start = (str.Length-1)/3;
    count = (str.Length-1)/4;
    Console.WriteLine();
    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);
    else
        Console.Write("(not found)");
    Console.WriteLine();
    }
}
/*

The first character occurrence from position 22 for 16 characters.
0----+----1----+----2----+----3----+----4----+----5----+----6----+-
0123456789012345678901234567890123456789012345678901234567890123456
Now is the time for all good men to come to the aid of their party.

A character in 'aid' occurs at position: 27

*/

// Sample for String.IndexOfAny(Char[], Int32, Int32)
import System.*;

class Sample
{
    public static void main(String[] args)
    {
        String br1 = "0----+----1----+----2----+----3----+----4----+----5----+"
            + "----6----+-";
        String br2 = "01234567890123456789012345678901234567890123456789012345"
            + "67890123456";
        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";
        char anyOf[] = target.ToCharArray();

        start = (str.get_Length() - 1) / 3;
        count = (str.get_Length() - 1) / 4;
        Console.WriteLine();
        Console.WriteLine("The first character occurrence from position {0} "
            + "for {1} characters.", (Int32)start, (Int32)count);
        Console.Write("{1}{0}", Environment.get_NewLine(), br1);
        Console.Write("{1}{0}", Environment.get_NewLine(), br2);
        Console.WriteLine("{1}{0}", Environment.get_NewLine(), str);
        Console.Write("A character in '{0}' occurs at position: ", target);

        at = str.IndexOfAny(anyOf, start, count);
        if (at > -1) {
            Console.Write(at);
        }
        else {
            Console.Write("(not found)");
        }
        Console.WriteLine();
    } //main
} //Sample
/*

The first character occurrence from position 22 for 16 characters.
0----+----1----+----2----+----3----+----4----+----5----+----6----+-
0123456789012345678901234567890123456789012345678901234567890123456
Now is the time for all good men to come to the aid of their party.

A character in 'aid' occurs at position: 27

*/

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0

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