Why is this cast not possible?

Question

interface IFolderOrItem where TFolderOrItem : FolderOrItem {}

abstract class FolderOrItem {}

class Folder : FolderOrItem {}

abstract class It         


        

Answer 1

As far as the compiler is concerened, IFolderOrItem & IFolderOrItem are two completely different types.

Document may inherit Item, but IFolderOrItem does not inherit IFolderOrItem

I'm relying on Marc or Jon to post links to the relevant portions of the C# spec.