Inheritance design using Interface + abstract class. Good practice?

Question

I\'m not really sure how to title this question but basically I have an interface like this:

public interface IFoo
{
    string ToCMD();
}

a co

Answer 1

I am not quite sure if this is what you are looking for but perhaps what you want to do is scrap the interface all together and do this:

abstract class Base
{
    public abstract string ToCMD();
}

abstract class Foo : Base { }

abstract class Bar : Base { }

Hopefully you have other members in the Foo and Bar classes! This will allow you to either restrict your custom collection by Base or just use a plain List.