C# String IndexOf(String, Int32, StringComparison)

Description

String IndexOf(String, Int32, StringComparison) reports the zero-based index of the first occurrence of the specified string in the current String object. Parameters specify the starting search position in the current string and the type of search to use for the specified string.

Syntax

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

public int IndexOf(
  string value,//ww w .  j av a  2s  .  co  m
  int startIndex,
  StringComparison comparisonType
)

Parameters

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

• value - The string to seek.
• startIndex - The search starting position.
• comparisonType - One of the enumeration values that specifies the rules for the search.

Returns

String.IndexOf(String, Int32, StringComparison) method returns The zero-based index position of the value parameter if that string is found, or -1 if it is not. If value is Empty, the return value is startIndex.

Example

In the following example, the IndexOf(String, Int32, StringComparison) method is used to find the position of a soft hyphen (U+00AD) followed by an "m" starting with the third character position in two strings.

//from w  ww.jav  a2s .c  o  m

using System;

public class Example
{
   public static void Main()
   {
      string searchString = "\u00ADm";
      string s1 = "ani\u00ADmal" ;
      string s2 = "animal";

      Console.WriteLine(s1.IndexOf(searchString, 2, StringComparison.CurrentCulture));
      Console.WriteLine(s1.IndexOf(searchString, 2, StringComparison.Ordinal));
      Console.WriteLine(s2.IndexOf(searchString, 2, StringComparison.CurrentCulture));
      Console.WriteLine(s2.IndexOf(searchString, 2, StringComparison.Ordinal));
   }
}

The code above generates the following result.