Do I still have to implement a singleton class manually in .net even when using .Net4.0?

Question

As soon as a singleton pattern is understood, writing the next singleton classes in C # is a brainless exercise. I hope the framework helps you by providing an interface or base class for this. Here is how I imagine it:

public sealed class Schablone : ISingleton<Schablone>
{
    // Stuff forced by the interface goes here

    // Extra logic goes here
}

Is there what I'm looking for?

Is there any syntactic sugar for building a singleton class - be it with an interface, class attribute, etc.?

Is it possible to write a useful and bulletproof ISingleton? Try to try?

Thank!

Answer 1

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Answer 2

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

    private Singleton() {}

    // Omit if you don't care about type initializer laziness
    static Singleton() {}
}

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Answer 3

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Answer 4

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public static class Singleton<T> where T: class, new() {
    public static T Instance {
        get {
            return Nested.instance;
        }
    }

    private static class Nested {
        public static readonly T instance = new T();

        static Nested() {}
    }
}

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:

Singleton<MyClass>.Instance.DoSomething();

Answer 5

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Answer 6

Inversion of Control .

With StructureMap, you can declare any type as a singleton:

ObjectFactory.Initilialize(x => x.ForSingletonOf<Schablone>());

To get it:

ObjectFactory.GetInstance<Schablone>();

Answer 7

.Net 4.0 comes with MEF. And you can use MEF to create singleton code. Through a common creation policy. I will dig a sample code ...

EDIT ----

even better, here is something doco ....

http://mef.codeplex.com/wikipage?title=Parts%20Lifetime&referringTitle=Guide

Answer 8

To cut. Paste. Further.