Can I overload an == operator on an Interface?

Question

I have an interface like this:

public interface IFoo
{
  int A {get;}
  int B {get;}
}

and I have multiple classes implementing IFoo.
I

Answer 1

No, you can neither overload an operator on an interface, nor ensure that any implementors do so (as operator overloading is static in C# ).

Your best option is what you've done, to make IFoo inherit from IEquatable and use Equals(IFoo)