Cast from Generics to Specific SubClass

Question

I have a class as such ``` public class MyClass where T : OneType { T MyObj { get; set; } public MyCLass(T obj) { } } public class SubClass: MyClass { } // snip for other similar class definition ``` where, `TwoType` is derived from `OneType`. Now, I have this utility method ``` public static MyClass Factory(T vd) where T : OneType { switch(vd.TypeName) { case Constant.TwoType return new SubClass((TwoType)vd); // snip for other type check } } ``` Which function is, obviously, checks the type of `vd`, and the creates an appropriate `MyClass` type. The only problem is the above code won't compile, and I don't know why The error is Cannot cast expression of T to TwoType

Accepted Answer

Amazing, I got it working by writing the code as such: ``` return (new SubClass(vd as TwoType) as MyClass); ``` or ``` return (MyClass)(object)new SubClass((TwoType)(object)vd ); ``` But, ``` return (MyClass)new SubClass((TwoType)vd ); ``` doesn't work. There seems to be a difference in `as` and `()` casting.

Cast from Generics<T> to Specific SubClass

Solution

Problem