Question

I have a Generic Interface

public interface TheInterface<T> where T : IObject

I also have an object class that this interface works with

public class SomeObject : IObject

I then have a class that implements the interface

public class ClassThatWorksWithSomeObject : TheInterface<SomeObject>

This all works well enough. Later on I add a class that works with TheInterface class independent of what version of IObject he uses.

public class IDoStuffToInterface
{
    public IDoStuffToInterface(TheInterface<IObject> interface)
    {
         //bla bla
    }
}

Problem is I can’t pass ClassThatWorksWithSomeObject in there, even if It inherits from the intreface and it’s generic object inherits from IObject.

I guess there are some cases that it could be hurtful if it did, but I can’t think of any.

Is there a way to do this better?

Answer 1

I don’t know the detail impelmentation, you can try:

public interface TheInterface<out T> where T : IObject 

if you are using C#4.0