Resolving type with Microsoft Unity and inherited interfaces

Question

I have this classes and interfaces

public interface IA{
  void Load();
}

public interface IB : IA{
}

public class B : IB{
   public void Load(){
      //some code
   }
}

and I register the IB for type B

Microsoft Unity resolves IB to correct type which is B, but when I try to call Load it shows an error IB does not contain a definition for 'Load'

Update

This is my unity configuration

var unityContainer = new UnityContainer();

unityContainer.RegisterType<IB, B>();

var obj = unityContainer.Resolve<IB>();
obj.Load()

I would say that that is probably because your class B doesn't implement Load() — Kevin
– Kevin, Commented Mar 29, 2016 at 20:56
That's not a unity issue, and your code above won't even compile. You're doing something else weird. What are you actually doing? — user1228
– user1228, Commented Mar 29, 2016 at 20:56
It seems that as Will says, you are still leaving out some details. I appreciate the attempt to cut out the unnecessary code for the sake of brevity, but I am guessing that you are cutting out something important that we can't see from the minimal code you are including — Kevin
– Kevin, Commented Mar 29, 2016 at 21:03

Dmitri M · Accepted Answer · 2016-03-30 14:31:14Z

1

IB does not contain definition for Load() but IA does, so you either have to resolve IA to B via unity or once you resolve IB, cast it to IA.

Update 1: I have to agree with other folks here, that the OP code does work and resolve correctly with Unity (tested with .NET 4.5.2 and Unity 2.1.505.2). I am not sure why my suggestion above solved the OP issue, so there has to be some details omitted in the original question.

Update 2: Working Fiddle based on @will's https://dotnetfiddle.net/FoYQSM

edited Mar 30, 2016 at 14:31

answered Mar 29, 2016 at 21:13

Dmitri M

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6 Comments

mxmissile Over a year ago

So Unity does not honor IB inheriting IA?

Reza Over a year ago

This solves the problem, but I am wondering how the unity doesnot honor the inheritance in Interfaces

Dmitri M Over a year ago

Are the interfaces in the same assembly and do you do any dynamic registration for your container?

user1228 Over a year ago

ffs, unity just instantiates types for you. It cannot "respect" or not "respect" the implementation of a type. Yall need help.

mxmissile Over a year ago

@Will There is a Your Answer text box below... use it!

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