Problem with Generics

Shane Poppleton

OK, i just thought i would simplify my question a bit:

The following won't compile (missing a cast)

 class Program
    {
        static void Main(string[] args)
        {
            foo f = foo.CreateMe();
        }
    }

    class foo : GenericTest    class bar

The following, compiles but has a run time error:

 class Program
    {
        static void Main(string[] args)
        {
            foo f = (foo)foo.CreateMe();
        }
    }

    class foo : GenericTest    class bar

1 Reply

Know the answer? Post it — somebody with the same question will find it here.

Shane Poppleton17y ago

Accepted answer

Ahh, you guys are no help :-P

I have a workaround, i will post here in case anyone has the same problem.
I added a second type parameter to the class and pass in the derived type so that my CreateMe() method knows what type to return.

 class Program
    {
        static void Main(string[] args)
        {
            foo f = foo.CreateMe();
        }
    }

    class foo : GenericTest
    {
    }

    class bar
    {
    }
    class GenericTest where U:new()
    {
        public static U CreateMe()
        {
            return new U();
        }
    }