Can method inheritated from interface return another type that in interface?

Question

Lets say I have a code like this:

interface IObject
{
     IObject GetSomeObject();
}

public class ObjectClass : IObject
{
     IObject GetSomeObject()
     {
     // method implementation here
     }
}

Is there any way, that I make GetSomeObject() method of class ObjectClass make return ObjectClass, no IObject?

I know I can use it like this:

ObjectClass object1= someObject1.GetSomeObject() as ObjectClass;

But what I want to achieve is:

public class ObjectClass : IObject
{
     ObjectClass GetSomeObject()
     {
     // method implementation here
     }
}     

Is it possible in that way?

Answer 1

You can use generics:

interface IObject<T> where T : IObject<T>
{
    T GetSomeObject();
}

public class ObjectClass : IObject<ObjectClass> { ... }

Answer 2

You can use an explicit interface implementation:

public interface IObject
{
     IObject GetSomeObject();
}

public class ObjectClass : IObject
{
    public ObjectClass GetSomeObject()
    {
        return this;
    }

    IObject IObject.GetSomeObject()
    {
        return this;
    }
}

This way, comsumers that access ObjectClass can call ObjectClass GetSomeObject(), whereas consumers that access an instance of this class through IObject can only call IObject GetSomeObject().