C# String LastIndexOf(Char, Int32)

Description

String LastIndexOf(Char, Int32) reports the zero-based index position of the last occurrence of a specified Unicode character within this instance. The search starts at a specified character position and proceeds backward toward the beginning of the string.

Syntax

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

public int LastIndexOf(
  char value,
  int startIndex
)

Parameters

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

• value - The Unicode character to seek.
• startIndex - The starting position of the search. The search proceeds from startIndex toward the beginning of this instance.

Returns

String.LastIndexOf(Char, Int32) method returns The zero-based index position of value if that character is found, or -1 if it is not found or if the current instance equals String.Empty.

Example

Sample for String.LastIndexOf(Char, Int32)

// w w w  .j a  va 2  s. co m
using System;

class Sample {
    public static void Main() {
    
        string str = "this is a test.";
        int start = str.Length-1;
        int at = 0;
        while((start > -1) && (at > -1)){
            at = str.LastIndexOf('t', start);
            if (at > -1) {
                Console.Write("{0} ", at);
                start = at - 1;
            }
        }
    }
}

The code above generates the following result.