dependency-injectionninjectninject-2

Ninject: Registering an already created instance with Ninject?

Can anyone tell me if i can register an already created instance of a class with Ninject so that it will use this instance everytime it needs injecting?

I suppose you can call it a singleton but I have the instance already created. All the documentation points to creating new instances of a class.

Solution

  • You can use the ToConstant method which takes an already existing instance and registers it as singleton.

    var kernel = new StandardKernel();
kernel.Bind<MyClass>().ToConstant(myClassInstance);

    If you want to something more complex you can use the ToMethod (where you can use a Func to get your instance) combined with the InSingletonScope

    var kernel = new StandardKernel();
kernel.Bind<MyClass>().ToMethod(context => myClassInstance).InSingletonScope();