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List<T>.Contains() method with example in C#

C# List<T>.Contains() method: Here, we are going to learn about the Contains() method of List with example.
Submitted by IncludeHelp, on March 15, 2019

C# List<T>.Contains() Method

List<T>.Contains() method is used to check whether list contains a specified element or not.

Syntax:

    bool List<T>.Contains(T item);

Parameter: It accepts an item of type T.

Return value: It returns a Boolean value. true if list contains the item, false if list does not contain the item.

Example:

    int list declaration:
    List<int> a = new List<int>();

    adding elements:
    a.Add(10);
    a.Add(20);
    a.Add(30);
    a.Add(40);
    a.Add(50);
    
    checking an item:
    a.Contains(10)
    
    Output:
    true

C# Example to check an item in the list using List<T>.Contains() Method

using System;
using System.Text;
using System.Collections.Generic;

namespace Test
{
    class Program
    {
        static void printList(List<int> lst)
        {
            //printing elements
            foreach (int item in lst)
            {
                Console.Write(item + " ");
            }
            Console.WriteLine();
        }

        static void Main(string[] args)
        {
            //integer list
            List<int> a = new List<int>();

            //adding elements
            a.Add(10);
            a.Add(20);
            a.Add(30);
            a.Add(40);
            a.Add(50);

            //print the list
            Console.WriteLine("list elements...");
            printList(a);

            //finding elements
            if (a.Contains(10))
                Console.WriteLine("List contains 10");
            else
                Console.WriteLine("List does not contain 10");

            if (a.Contains(60))
                Console.WriteLine("List contains 60");
            else
                Console.WriteLine("List does not contain 60");

            //hit ENTER to exit
            Console.ReadLine();
        }
    }
}

Output

list elements...
10 20 30 40 50
List contains 10
List does not contain 60





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