Internal abstract class: how to hide usage outside assembly?

Question

I have a common assembly/project that has an abstract base class, then several derived classes that I want to make public to other assemblies.

I don\'t want the abs

Answer 1

The abstract base class has to be public, as the entire inheritance heirarchy for a class has to be visible. This ensures the polymorphism works and is valid; however all the base classes' members can be internal (including the constructor), and hence not usable outside your assembly