Question

I’ve spent a few hours on and off trying to find an answer to this, I’m probably having trouble with wording the question correctly, which doesn’t help. Essentially, I have an abstract class:

public abstract class GenericType<T>
{ ... }

And a bunch of classes that inherit from it:

public class AType: GenericType<A>
{ ... }

public class BType: GenericType<B>
{ ... }

...

Lastly, I have another class that wants to contain a list of things that inherit from GenericType, regardless of the value of T, i.e. Atypes, BTypes and so on.

My first attempts were to use List<GenericType> and List<GenericType<Object>> but niether’s given me any joy.

Any tips on how I should be going about this? Much thanks!

Answer 1

So, if I understand correctly, you want something like this:

List<GenericType>

Which can contain any instance of AType, BType, etc. You simply do this by making GenericType<T> itself a subclass of GenericType:

public class GenericType { }
public class GenericType<T> : GenericType { }
public class AType : GenericType<int> { }
public class BType : GenericType<int> { }

You can then stick any instance into a List<GenericType>.