C# | Check if a value is in LinkedList<T>

LinkedList<T>.Contains(T) method is used to check whether a value is in the LinkedList<T> or not. Syntax:

public bool Contains (T value);

Here, value is the value to locate in the LinkedList<T>. The value can be null for reference types. Return Value: This method returns True if value is found in the LinkedList, otherwise, False. Below given are some examples to understand the implementation in a better way: Example 1:

CSHARP

// C# code to check if a
// value is in LinkedList
using System;
using System.Collections;
using System.Collections.Generic;

class GFG {

    // Driver code
    public static void Main()
    {
        // Creating a LinkedList of Strings
        LinkedList<String> myList = new LinkedList<String>();

        // Adding nodes in LinkedList
        myList.AddLast("A");
        myList.AddLast("B");
        myList.AddLast("C");
        myList.AddLast("D");
        myList.AddLast("E");

        // To check if a value is in LinkedList
        Console.WriteLine(myList.Contains("B"));
    }
}

Output:

True

Example 2:

CSHARP

// C# code to check if a
// value is in LinkedList
using System;
using System.Collections;
using System.Collections.Generic;

class GFG {

    // Driver code
    public static void Main()
    {
        // Creating a LinkedList of Integers
        LinkedList<int> myList = new LinkedList<int>();

        // Adding nodes in LinkedList
        myList.AddLast(1);
        myList.AddLast(2);
        myList.AddLast(3);
        myList.AddLast(4);
        myList.AddLast(5);

        // To check if a value is in LinkedList
        Console.WriteLine(myList.Contains(8));
    }
}

Output:

False

Note: This method performs a linear search. Therefore, this method is an O(n) operation, where n is Count. 

Space complexity: O(n) where n is size of the LinkedList

Reference: 

• https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.linkedlist-1.contains?view=netframework-4.7.2