Question

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Singleton by Jon Skeet clarification

I am reading up on Singletons and and now (also thanks to SO) quite clued up.

My implementation (which should be text book) looks like

public sealed class Singleton
{
   private static readonly Singleton instance = new Singleton();

   private Singleton(){ }    
   static Singleton(){ }

   public static Singleton Instance { get { return instance; } }
}

My question is, on .NET 4.0, should I include the constructors (I think the private ctor is implicitly created – but what about the static (doubtful)).

The following seems to work just as well, but I’m concerned it only works well in my contrived test example.

public sealed class Singleton
{
    private static readonly Singleton instance = new Singleton();    
    public static Singleton Instance { get { return instance; } }
}

Answer 1

My question is, on .NET 4.0, should I include the constructors (I think they are now implicitly created).

Yes, there is no change in Fx4 or C# 4.
If you don’t provide the instance constructor then the compiler provides a public one.
There is no reason to provide the static constructor.

The following seems to work just as well,

The point is that var s = new Singleton(); should not work. That’s the thing to test.