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Editorial Team
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Asked: 2026-05-18T01:43:37+00:00

I have for instance 2 interfases IInterface1 and IInterface2 , public interface IInterface1 {…}

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I have for instance 2 interfases IInterface1 and IInterface2,

public interface IInterface1 {...}
public interface IInterface2 {...}

and one implementation of these interfaces ImplClass. 

public class ImplClass : IInterface1, IInterface2 {...}

I have to be sure that application has only one instance of ImplClass, which will be used as IInterface1 and IInterface2.
I’m using ninject for dependency injection. So my qustion is: Does code below will meet my requirements?

...
Bind<IInterface1>().To<ImplClass>().Using<SingletonBehavior>();
Bind<IInterface2>().To<ImplClass>().Using<SingletonBehavior>();
...

Or this code will create 2 instances of ImplClass, for eash interface?

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1 Answer

  1. Editorial Team

    With Ninject you can do this:

    var impl = new Impl();
container.Bind<IInt1>().ToMethod(c => impl);
container.Bind<IInt2>().ToMethod(c => impl);

    When the Impl class has dependencies you can’t Ninject to inject, you can do this:

    container.Bind<Impl>().ToSelf().InSingletonScope();
container.Bind<IInt1>().ToMethod(c => c.Kernel.Get<Impl>());
container.Bind<IInt2>().ToMethod(c => c.Kernel.Get<Impl>());

    Nice and clean.

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