C# List IndexOf(T)

Description

List IndexOf(T) searches for the specified object and returns the zero-based index of the first occurrence within the entire List .

Syntax

List.IndexOf(T) has the following syntax.


public int IndexOf(
  T item
)

Parameters

List.IndexOf(T) has the following parameters.

  • item - The object to locate in the List . The value can be null for reference types.

Returns

List.IndexOf(T) method returns The zero-based index of the first occurrence of item within the entire List, if found; otherwise, -1.

Example


using System;/*from   w  w w  . j av a2  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.





















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HashSet
LinkedList
LinkedListNode
List
Queue
SortedSet
Stack