C# | Get the first node of the LinkedList<T>
LinkedList<T>.First property is used to get the first node of the LinkedList<T>.
Syntax:
public System.Collections.Generic.LinkedListNode First { get; }
Return Value: The first LinkedListNode<T> of the LinkedList<T>.
Below given are some examples to understand the implementation in a better way:
Example 1:
// C# code to get the first // node of 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( "Beginner" ); myList.AddLast( "for" ); myList.AddLast( "Data Structures" ); myList.AddLast( "Noida" ); // To get the first node of the LinkedList if (myList.Count > 0) Console.WriteLine(myList.First.Value); else Console.WriteLine( "LinkedList is empty" ); } } |
Output:
Beginner
Example 2:
// C# code to get the first // node of 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 >(); // To get the first node of the LinkedList if (myList.Count > 0) Console.WriteLine(myList.First.Value); else Console.WriteLine( "LinkedList is empty" ); } } |
Output:
LinkedList is empty
Note:
- LinkedList accepts null as a valid Value for reference types and allows duplicate values.
- If the LinkedList is empty, the First and Last properties contain null.
- Retrieving the value of this property is an O(1) operation.
Reference:
- https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.linkedlist-1.first?view=netframework-4.7.2
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