Question

Let’s say I have

public class ClassA : Ione, Itwo
public class ClassB : Ione, Itwo
public class ClassC : Ione, Itwo

and a method MethodA that returns an instance of ClassA, ClassB or ClassC.
MethodA return type can be Ione or Itwo.

How can I achive that?.

I have tryed using generics like this:

public T MethodA<T>(myEnum e) where T : Ione, Itwo

but when typing return (T)new ClassA(); I get the error “Cannot convert type ClassA to T”.

Thanks.

Answer 1

Unite the two interfaces:

interface ITogether : Ione, Itwo { }

And use that as the return type.

You’ll probably need your classes to implement ITogether instead of Ione and Itwo, but you should try both ways.