CODEWITHSUNDEEP
c#ninject
zimdanen
zimdanen

Reputation: 5626

Best way to bind an interface to the result of another binding

Let's say I have the following interface and class:

public interface IMyService
{
    void DoSomething();
}

public class MagicInterfaceImplementor<T>
{
    public T GetImplementation()
    {
        // Not relevant.
    }
}

The only way to get an instance of IMyService is through MagicInterfaceImplementor<IMyService>. I can obviously setup injection pretty easily for MagicInterfaceImplementor<IMyService>:

Bind<MagicInterfaceImplementor<IMyService>().ToSelf();

[Strictly, this isn't necessary in this particular instance, but I'm doing a bit more with the binding in the actual case.]

My question is - how do I bind IMyService?

I think I can do this, but I'm not sure that it's the best way, since I'm explicitly calling the Kernel, which is typically frowned upon:

Bind<IMyService>().ToMethod(context => {
    return ((MagicInterfaceImplementor<IMyService>)
            context.Kernel.GetService(typeof(MagicInterfaceImplementor<IMyService>)))
                .GetImplementation();
});

Any suggestions of a more proper way to do this would be appreciated.

Upvotes: 0

Views: 67

Answers (1)

treze
treze

Reputation: 3289

Maybe it would be interesting what exactly MagicImplementor does. So this is more of a guess, but maybe a Provider might help you.

https://github.com/ninject/ninject/wiki/Providers,-Factory-Methods-and-the-Activation-Context

Otherwise you can simply write

Bind<IMyService>().ToMethod(ctx => ctx.Kernel.Get<MagicInterfaceImplementor<IMyService>>().GetImplementation());

Upvotes: 1

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