Namespace:
System.Collections.Generic
Assembly:
System (in System.dll)
Visual Basic (Declaration)
Public ReadOnly Property First As LinkedListNode(Of T)
Dim instance As LinkedList
Dim value As LinkedListNode(Of T)
value = instance.First
public LinkedListNode<T> First { get; }
public:
property LinkedListNode<T>^ First {
LinkedListNode<T>^ get ();
}
public function get First () : LinkedListNode<T>
LinkedList<(Of <(T>)>) accepts nullNothingnullptra null reference (Nothing in Visual Basic) as a valid Value for reference types and allows duplicate values.
If the LinkedList<(Of <(T>)>) is empty, the First and Last properties contain nullNothingnullptra null reference (Nothing in Visual Basic).
Retrieving the value of this property is an O(1) operation.
The following code example and output demonstrate the First property. The code example inserts a node at the beginning of a linked list of nodes containing strings, uses the First property to mark the first element, then removes the element and adds it to the end of the list.
This code and output are part of a larger example provided for the LinkedList<(Of <(T>)>) class.
' Move the first node to be the last node.
Dim mark1 As LinkedListNode(Of String) = sentence.First
sentence.RemoveFirst()
sentence.AddLast(mark1)
// Move the first node to be the last node.
LinkedListNode<string> mark1 = sentence.First;
sentence.RemoveFirst();
sentence.AddLast(mark1);
sentence->AddFirst("today");
Display(sentence);
LinkedListNode<String^>^ mark1 = sentence->First;
sentence->RemoveFirst();
sentence->AddLast(mark1);
Display(sentence);
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
.NET Framework
Supported in: 3.5, 3.0, 2.0
.NET Compact Framework
Supported in: 3.5, 2.0
XNA Framework
Supported in: 3.0, 2.0, 1.0
Reference