LinkedList<T>.AddFirst Method (T)

LinkedList<T> accepts null as a valid Value for reference types and allows duplicate values.

If the LinkedList<T> is empty, the new node becomes the First and the Last.

This method is an O(1) operation.

The following code example and output demonstrate the use of the AddFirst method. The code example uses the AddFirst(T) method overload to create a new node to hold a value, and to insert that node at the beginning of a linked list of strings. The code example displays the list, marks and removes the first node, and adds it to the end of the list.

This code and output are part of a larger example provided for the LinkedList<T> class.

// Move the first node to be the last node.
LinkedListNode<string> mark1 = sentence.First;
sentence.RemoveFirst();
sentence.AddLast(mark1);

.NET Framework

.NET Framework Client Profile

Portable Class Library

.NET for Windows Store apps

Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Reference