Understanding Covariant and Contravariant interfaces in C#

Question

I\'ve come across these in a textbook I am reading on C#, but I am having difficulty understanding them, probably due to lack of context.

Is there a good concise exp

Answer 1

This post is the best I've read on the subject

In short, covariance / contravariance /invariance deals with automatic type casting (from base to derived and vice-versa). Those type casts are possible only if some guarantees are respected in terms of read / write actions performed on the casted objects. Read the post for more details.