CODEWITHSUNDEEP
ninject
Martino
Martino

Reputation: 52

Caller Contextual Binding NInject

I need to compose an instance conditionally depending on the caller.

In some cases I need a composite object instances with a "deep" type "NullService"

in other cases I instead inject a "ConcreteService"

I expect something like this:

Get<Root>.with(NullService)

or

 Get<Root>.with(ConcreteService)

or better still if one could bind the construction so that it dated back to the calling context

Bind<IService>.to(ConcreteService).
Bind<IService>.to(NullService).only.whenCallerIsTypeOf(CallerWhosNeedsANullService)

is it possible?

Upvotes: 1

Views: 304

Answers (1)

Remo Gloor
Remo Gloor

Reputation: 32725

There are two ways:

  1. Use an own condition in case you can calculate which one should be used:

    Bind<IService>.To(NullService)
    .When(ctx => IsCallerWhosNeedsANullService(HttpContext.Current.Request));

  2. Use Named bindings

    Bind<Root>().ToSelf().Named("DefaultRoot");
Bind<Root>().ToSelf().Named("NullRoot");
Bind<IService>.To(ConcreteService);
Bind<IService>.To(NullService).WhenAnyAnchestorNamed("NullRoot");

Get<Root>("NullRoot");

Upvotes: 1

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