C# List IndexOf(T, Int32, Int32)

Description

List IndexOf(T, Int32, Int32) searches for the specified object and returns the zero-based index of the first occurrence within the range of elements in the List that starts at the specified index and contains the specified number of elements.

Syntax

List.IndexOf(T, Int32, Int32) has the following syntax.

public int IndexOf(
  T item,//  w  w  w  .j a  va  2 s.  c o m
  int index,
  int count
)

Parameters

List.IndexOf(T, Int32, Int32) has the following parameters.

• item - The object to locate in the List . The value can be null for reference types.
• index - The zero-based starting index of the search. 0 (zero) is valid in an empty list.
• count - The number of elements in the section to search.

Returns

List.IndexOf(T, Int32, Int32) method returns The zero-based index of the first occurrence of item within the range of elements in the List that starts at index and contains count number of elements, if found; otherwise, -1.

Example

using System;/*from   www.  ja v  a 2 s .  c  o m*/
using System.Collections.Generic;

public class Example
{
    public static void Main()
    {
        List<string> myData = new List<string>();

        myData.Add("A");
        myData.Add("B");
        myData.Add("C");
        myData.Add("D");
        myData.Add("A");

        foreach(string myD in myData)
        {
            Console.WriteLine(myD);
        }

        Console.WriteLine(myData.IndexOf("A"));

        Console.WriteLine(myData.IndexOf("A", 3));

        Console.WriteLine(myData.IndexOf("A", 2, 2));
    }
}

The code above generates the following result.