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C# List<T>.Contains() Method with Example

C# List<T>.Contains() Method: In this tutorial, we will learn about the Contains() method of List collection with its usage, syntax, and an example using C# program. By IncludeHelp Last updated : April 15, 2023

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(s)

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# program 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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