Builder design pattern with inheritance: is there a better way?

Question

I\'m creating a series of builders to clean up the syntax which creates domain classes for my mocks as part of improving our overall unit tests. My builders essentially pop

Answer 1

This is a good implementation strategy for C#.

Some other languages (can't think of name of research language I've seen this in) have type systems that either support a covariant "self"/"this" directly, or have other clever ways to express this pattern, but with C#'s type system, this is a good (only?) solution.