Force subclasses of an interface to implement ToString

Question

Say I have an interface IFoo and I want all subclasses of IFoo to override Object\'s ToString method. Is this possible?

Simpl

Answer 1

Jon & Andrew: That abstract trick is really useful; I had no idea you could end the chain by declaring it as abstract. Cheers :)

In the past when I've required that ToString() be overriden in derived classes, I've always used a pattern like the following:

public abstract class BaseClass
{
    public abstract string ToStringImpl();

    public override string ToString()
    {
        return ToStringImpl();
    }    
}