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String.LastIndexOfAny Method (Char[], Int32)

Reports the index position of the last occurrence in this instance of one or more characters specified in a Unicode array. The search starts at a specified character position.

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

public int LastIndexOfAny (
	char[] anyOf,
	int startIndex
)
public int LastIndexOfAny (
	char[] anyOf, 
	int startIndex
)
public function LastIndexOfAny (
	anyOf : char[], 
	startIndex : int
) : int

Parameters

anyOf

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

startIndex

The search starting position.

Return Value

The index position of the last 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

startIndex specifies a position not within this instance.

Index numbering starts from zero.

This method begins searching at the startIndex character position of this instance and proceeds backwards towards the beginning until either a character in anyOf is found or the first character position has been examined. The search 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 values are the same. To perform a culture-sensitive search, use the CompareInfo.LastIndexOf 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 last occurrence of any character in the string "is" within a substring of another string.

// Sample for String.LastIndexOfAny(Char[], 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;
    string target = "is";
    char[] anyOf = target.ToCharArray();

    start = (str.Length-1)/2;
    Console.WriteLine("The last character occurrence  from position {0} to 0.", start);
    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.LastIndexOfAny(anyOf, start);
    if (at > -1) 
        Console.Write(at);
    else
        Console.Write("(not found)");
    Console.Write("{0}{0}{0}", Environment.NewLine);
    }
}
/*
This example produces the following results:
The last character occurrence  from position 33 to 0.
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 'is' occurs at position: 12


*/

// Sample for String.LastIndexOfAny(Char[], 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;
        String target = "is";
        char anyOf[] = target.ToCharArray();

        start = (str.get_Length() - 1) / 2;
        Console.WriteLine("The last character occurrence  from position {0} "
            + "to 0.", (Int32)start);
        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.LastIndexOfAny(anyOf, start);
        if (at > -1) {
            Console.Write(at);
        }
        else {
            Console.Write("(not found)");
        }
        Console.Write("{0}{0}{0}", Environment.get_NewLine());
    } //main
} //Sample
/*
This example produces the following results:
The last character occurrence  from position 33 to 0.
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 'is' occurs at position: 12


*/

Windows 98, Windows 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 .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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