Why doesn't my interface inherit?

Question

I must be doing something wrong

public interface IActor
{
    //actor stuff
}

public class BaseShip : IActor
{
    //base ship stuff
}

public class PlayerShip: BaseShip
{
    //Only the stuff for this particular ship
}

Why then doesn't this work:

IActor player = new PlayerShip();

Or

List<IActor> actors = new List<IActor>(){new PlayerShip()};

I get Cannot convert from [PlayerShip] to [IActor]

note: snipped code for brevity

---

Update

I accidently defined the interface in two different namespaces. Nothing more to it.

Answer 1

Are you certain this is your structure? I copied and pasted your code and the actions compiled and ran fine for me.

EDIT:

You guys need to step back for a second...interfaces certainly do propogate down the chain of inheritance. You're telling me that an inherited control doesn't implement IDisposable?