LinkedList(T).First Property (System.Collections.Generic)

First Property

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This page is specific to

Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:

.NET Framework Class Library

LinkedList<(Of <(T>)>)..::.First Property

Gets the first node of the LinkedList<(Of <(T>)>).

Namespace: System.Collections.Generic
Assembly: System (in System.dll)

Syntax

Visual Basic (Declaration)

Public ReadOnly Property First As LinkedListNode(Of T)

Visual Basic (Usage)

Dim instance As LinkedList
Dim value As LinkedListNode(Of T)

value = instance.First

public LinkedListNode<T> First { get; }

Visual C++

public:
property LinkedListNode<T>^ First {
    LinkedListNode<T>^ get ();
}

JScript

public function get First () : LinkedListNode<T>

Property Value

Type: System.Collections.Generic..::.LinkedListNode<(Of <(T>)>)
The first LinkedListNode<(Of <(T>)>) of the LinkedList<(Of <(T>)>).

Remarks

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.

Examples

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.

Visual Basic

' 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);

Visual C++

sentence->AddFirst("today");
Display(sentence);

LinkedListNode<String^>^ mark1 = sentence->First;
sentence->RemoveFirst();
sentence->AddLast(mark1);
Display(sentence);

Platforms

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.

Version Information

.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

LinkedList<(Of <(T>)>) Class

LinkedList<(Of <(T>)>) Members

System.Collections.Generic Namespace