Are class diagrams updated automatically? If not, can this be done?

Question

Are class diagrams updated automatically?

If not, is it possible to do this, so new classes are automatically added and deleted / renamed classes are removed from the class diagram? Maybe there is a plugin for this?

Answer 1

Yes, class diagrams in Visual Studio are kept in sync with the code. You can very easily verify this.

What more, a class may appear in several diagrams. All diagrams and code are synchronized.