C# String IndexOf(Char, Int32, Int32)

Description

String IndexOf(Char, Int32, Int32) reports the zero-based index of the first occurrence of the specified character in this instance. The search starts at a specified character position and examines a specified number of character positions.

Syntax

String.IndexOf(Char, Int32, Int32) has the following syntax.


public int IndexOf(
  char value,//from  w w w .  ja v a2  s  .  c o  m
  int startIndex,
  int count
)

Parameters

String.IndexOf(Char, Int32, Int32) has the following parameters.

value - A Unicode character to seek.
startIndex - The search starting position.
count - The number of character positions to examine.

Returns

String.IndexOf(Char, Int32, Int32) method returns The zero-based index position of value if that character is found, or -1 if it is not.

Example

The following example demonstrates the IndexOf method.


//from ww  w .  ja va2s  .  c  om
using System;

class IndexOfCII 
{
    public static void Main() 
    {
        string searched = "ABCDEFGHI  ABCDEFGHI  " +
            "ABCDEFGHI abcdefghi ABCDEFGHI";

        Char target= 'A';

        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 );
    }
}

The code above generates the following result.