List of abstract class with generic parameter type?

Question

Let's say I have these classes:

public abstract class Thing<T> { }

public class Str : Thing<string> { }

public class Boo : Thing<bool> { }

I'd like to create a List of Thing.

This is an example of what I'd like to do (invalid C# code):

new List<Something>()
{
    new Str(),
    new Boo()
};

How could I do something like that, would it even be possible?

I found this but couldn't seem to correctly understand any of the proposed answers.

Answer 1

To satisfy List<Something> then Thing<T> must inherit Something. The answers in the post you linked have the solution: you need to introduce a non-generic base class.

public abstract class Something { }
public abstract class Thing<T>: Something { }

public class Str : Thing<string> { }
public class Boo : Thing<bool> { }

new List<Something>()
{
    new Str(),
    new Boo()
};