Question

A question was raised in a discussion I had around whether an interface method should return a Custom object vs a primitive type.

e.g.

public interface IFoo
{
      bool SomeMethod();
}

vs

public interface IFoo
{
    MyFooObj SomeMethod();
}

Where MyFooObj is:

public class MyFooObj
{
     bool SomeProp{get;set;}
}

The argument being that you can easily add properties to the object in the future without needing to change the interface contract.

I am unsure what the standard guidelines on this are?

Answer 1

IMHO Changing the MyFooObj is the same as changing/adding methods to the IFoo Interface – so no I don’t think it’s a good idea add just another abstraction – remember YAGNI