C# | Removing all nodes from LinkedList<T>

LinkedList<T>.Clear method is used to remove the all nodes from the LinkedList<T>.

Syntax:

public void Clear ();

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

Example 1:

// C# code to remove all
// nodes from 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);

        // Removing all nodes from LinkedList
        myList.Clear();

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

Output:

Total nodes in myList are : 5
Total nodes in myList are : 0

Example 2:

// C# code to remove all
// nodes from 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);

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

        // Removing all nodes from LinkedList
        myList.Clear();

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

Output:

Total nodes in myList are : 3
Total nodes in myList are : 0

Note:

• Count is set to zero, and references to other objects from elements of the collection are also released.
• First and Last are set to null.
• This method is an O(n) operation, where n is Count.

Reference:

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