C# String IndexOfAny(Char[])

Description

String IndexOfAny(Char[]) reports the zero-based index of the first occurrence in this instance of any character in a specified array of Unicode characters.

Syntax

String.IndexOfAny(Char[]) has the following syntax.

public int IndexOfAny(
  char[] anyOf
)

Parameters

String.IndexOfAny(Char[]) has the following parameters.

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

Returns

String.IndexOfAny(Char[]) method returns 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.

Example

The following example uses the IndexOfAny method to check for invalid characters in a user entered string.

/*from   w  w  w  . java2  s.c  o  m*/

using System;
public class MainClass
{
    public static void Main(String[] argv)
    {
        System.Console.WriteLine("java2s.com".IndexOfAny(new char[] { 'a' }));
    }
}

The code above generates the following result.