Explicit Casting Problem

Question

// The Structure of the Container and the items
public interface IContainer  where TItem : IItem
{

}

public class AContainer : IContainer         


        

Answer 1

Another generics covariant problem...

Generic types in .NET are not covariant or contravariant - IContainer (which is what AContainer is) is not a subclass of IContainer - there is no valid cast between the two. This will be fixed in C# 4.