C# | Removing the specified node from the LinkedList<T>

Remove(LinkedListNode<T>) method is used to remove the specified node from the LinkedList<T>.

Syntax:

public void Remove (System.Collections.Generic.LinkedListNode<T> node);

Here, node is the LinkedListNode<T> to remove from the LinkedList<T>.

Exceptions:

• ArgumentNullException : If the node is null.
• InvalidOperationException : If the node is not in the current LinkedList<T>.

Below given are some examples to understand the implementation in a better way:

Example 1:

// C# code to remove the specified
// node from the 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(2);
        myList.AddLast(4);
        myList.AddLast(6);
        myList.AddLast(8);

        // To get the count of nodes in LinkedList
        // before removing all the nodes
        Console.WriteLine("Total nodes in myList are : " + myList.Count);

        // Displaying the nodes in LinkedList
        foreach(int i in myList)
        {
            Console.WriteLine(i);
        }

        // Removing the first node from the LinkedList
        myList.Remove(myList.First);

        // To get the count of nodes in LinkedList
        // after removing all the nodes
        Console.WriteLine("Total nodes in myList are : " + myList.Count);

        // Displaying the nodes in LinkedList
        foreach(int i in myList)
        {
            Console.WriteLine(i);
        }
    }
}

Output:

Total nodes in myList are : 4
2
4
6
8
Total nodes in myList are : 3
4
6
8

Example 2:

// C# code to remove the specified
// node from the 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 get the count of nodes in LinkedList
        // before removing all the nodes
        Console.WriteLine("Total nodes in myList are : " + myList.Count);

        // Displaying the nodes in LinkedList
        foreach(string str in myList)
        {
            Console.WriteLine(str);
        }

        // Removing the specified node from the LinkedList
        myList.Remove("D");

        // To get the count of nodes in LinkedList
        // after removing all the nodes
        Console.WriteLine("Total nodes in myList are : " + myList.Count);

        // Displaying the nodes in LinkedList
        foreach(string str in myList)
        {
            Console.WriteLine(str);
        }
    }
}

Output:

Total nodes in myList are : 5
A
B
C
D
E
Total nodes in myList are : 4
A
B
C
E

Note: This method is an O(1) operation.

Reference:

https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.linkedlist-1.remove?view=netframework-4.7.2#System_Collections_Generic_LinkedList_1_Remove_System_Collections_Generic_LinkedListNode__0__