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Singleton Pattern VB.NET using Static Variable

, 24 May 2012
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The most elegant implementation for VB.NET and safe as simple

Introduction

I have seen many implementations of the Singleton pattern. This one seems to be the most elegant for VB.NET and is as safe as simple.

Theory

Static Local Variables in VB.NET

In VB, a local variable marked as static, apart from usual local variable, continues to exist and retains its most recent value. Moreover, it is initialized only once and this operation is thread safe.

What it simply means is that while the first time property is accessed, the variable is defined and initialized with a value given. Every next call initialization and declaration is ignored and the variable is used as shared/static for this class and continues to exist for a lifetime of the class.

Singleton Pattern Implementation

Public Class Singleton

    Private Sub New()

    End Sub

    Public Shared ReadOnly Property GetInstance As Singleton
        Get
            Static Instance As Singleton = New Singleton
            Return Instance
        End Get
    End Property

End Class

Please do let me know if there are any pitfalls or if you have other ideas.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Evgeniy Sukhikh
Web Developer
Ukraine Ukraine
No Biography provided

Comments and Discussions

 
BugI think that it is wrong because this singleton is always creating a new instance, you need to question if is this nothing PinmemberNicolás Bjorklund14-Nov-13 6:26 
GeneralRe: I think that it is wrong because this singleton is always creating a new instance, you need to question if is this nothing [modified] PinmemberMPelletierProg9-Apr-14 5:07 
SuggestionSingletone PinprotectorAspDotNetDev25-May-12 13:40 
GeneralRe: Singletone PinmemberEvgeniySu26-May-12 9:10 
GeneralIt still needs more explanation PinmemberPIEBALDconsult25-May-12 8:39 
GeneralRe: It still needs more explanation PinmemberEvgeniySu26-May-12 9:32 
QuestionInstantiation PinmemberCtznkane24-May-12 8:33 
AnswerRe: Instantiation PinmemberPIEBALDconsult25-May-12 8:29 
GeneralMy vote of 1 PinmemberMarcus Kramer23-May-12 8:45 
GeneralRe: My vote of 1 PinmemberEvgeniySu23-May-12 11:15 
GeneralRe: My vote of 1 Pinmemberkfsdavidt6424-May-12 3:25 
GeneralRe: My vote of 1 PinmemberEvgeniySu24-May-12 22:57 
QuestionGood, though... PinmemberJose Menendez Póo23-May-12 8:37 
AnswerRe: Good, though... PinmemberEvgeniySu23-May-12 11:16 

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