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Linked List in C#

In this article, we will learn about the LinkedList class.

C# LinkedList class uses the concept of doubly linked list. The LinkedList Collection represents a doubly linked list. It allows insertion, deletion and other operations from the linked list. This collection is found in System.Collections.Generic namespace.

Creating a LinkedList

We create a linked list in C# using the following syntax:
LinkedList<T> l1 = new LinkedList<T>();
<T> here denotes any datatype of which we want to create a linked list of.


Properties of Linked List

  • Count: This property gets the number of nodes actually contained in the LinkedList.</li>
  • First: This property gets the first node of the LinkedList.</li>
  • Last: This property gets the last node of the LinkedList.</li> </ul>

    Methods of Linked List

    • AddFirst(T): This method adds a new node containing the specified value at the start of the LinkedList.</li>
    • AddLast(T): This method adds a new node containing the specified value at the end of the LinkedList.</li>
    • Contains(T): This method determines whether a value is in the LinkedList.</li>
    • Remove(T): This method removes the first occurrence of the specified value from the LinkedList.</li>
    • RemoveFirst(): This method removes the node at the start of the LinkedList.</li>
    • RemoveLast(): This method removes the node at the end of the LinkedList.</li>
    • Clear(): This method removes all the nodes from the LinkedList.</li> </ul>

      LinkedList Operation Examples:

      Different LinkedList operations are demonstrated in the example below:

      using System;
      using System.Collections.Generic;
      namespace LinkedListDemo {
          class Example {
              static void Main(string[] args) {
                  LinkedList < int > L = new LinkedList < int > ();
                  L.AddFirst(5);          // Adds to the beginning
                  L.AddFirst(2);          
                  L.AddLast(4);           // Adds to the ending
                  L.AddLast(9);
                  foreach(int i in L) {
                      Console.Write(i + " ");
                  }
                  Console.WriteLine();
                  L.RemoveFirst();        // Removes from the beginning
                  L.RemoveLast();         // Removes from the ending
                  foreach(int i in L) {
                      Console.Write(i + " ");
                  }
                  Console.WriteLine();
                  Console.WriteLine(list.Contains(3));    // Checks if 3 is present in the list
                  Console.WriteLine(list.Contains(5));    // Checks if 5 is present in the list
                  Console.WriteLine(list.First.Value);    // 'First' returns the first node in list
                                                          // 'Value' returns the value of the node
              }
          }
      }
      

      Output:

      2 5 4 9
      5 4
      False
      True
      5

      Task

      In the editor below, perform the different tasks as directed.

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