Interface for Child Class that Inherits from parent class without reimplementing parent class

Currently I have the following:

public class ChildClass : ParentClass
{...

ParentClass implements an interface as follows (I need ParentClass to be instantiated and therefore can't be abstract):

public class ParentClass : IParentClass
{...

I also want child class to implement an interface so that I can mock this class out, but I want the inherited members of ParentClass to be visible to the ChildClass Interface.

So if I have a method MethodA() in the parent class, I want this method to be able to be called when using IChildClass and not just ChildClass.

The only way I can think of is to override the method in the ChildClass, define that method in IChildClass and the just call base.MethodA() but this doesnt really seem correct

Best How To :

If I understand you correctly, you're saying that you want an inheritance hierarchy in your interfaces as well as your classes.

This is how you'd achieve such a thing:

public interface IBase 
{
    // Defines members for the base implementations
}

public interface IDerived : IBase
{
    // Implementors will be expected to fulfill the contract of
    // IBase *and* whatever we define here
}

public class Base : IBase
{
    // Implements IBase members
}

public class Derived : Base, IDerived
{
     // Only has to implement the methods of IDerived, 
     // Base has already implement IBase
}

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