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Simple Singleton Pattern in C#

ForgaSw

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27 Oct 2011CPOL

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Another alternative: class Singleton { public static Singleton m_Instance; //Prevent instance creation from other classes private Singleton() { } public static Singleton Instance { get { return m_Instance ?? (m_Instance = new Singleton()); } ...

Another alternative:

class Singleton 
{
    public static Singleton m_Instance;
 
    //Prevent instance creation from other classes
    private Singleton() { }
 
    public static Singleton Instance 
    { 
       get { return m_Instance ?? (m_Instance = new Singleton()); } 
    }
}

Could you comment pros and cons with alternative-3?

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ForgaSw

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Comments and Discussions

While Alternative 4 will only load the instance when it is called, it could have some concurrency issues as two threads could call it instantiating two separate instances. Alternative 3 would not have concurrency issues, but would instantiate the instance the first time the class type is referenced in code.

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