This book describes all the GoF patterns in C#. In my opinion it has several problems:
- First, all the examples are based in the same context, a fireworks factory. Although it might seem a fun concept, it's terrible when the writer tries to "squeeze" all the patterns into this context. Some patterns don't really make any sense at all. The examples have complex details that include information that doesn't help a thing explaining the concepts. ex: in the Facade pattern (which is probably the simplest pattern), the writer creates an example based on the trajectory of a firework, and then spends 3 pages explaining parametric equations... ???
- The book has many chalenges, and although I find that a positive thing, I hate the way the writer tries to force the reader into those chalenges. Many patterns (almost all) don't include a complete UML model, because it has to be the reader to fill in the spaces of an incomplete diagram... It's very frustrating.
I really, really tried to like this book, and I understand the motivation behind some of the writer decisions, but I don't find this book helpful for beginners nor for advanced software architects... Pick Gof book and "Design Patterns Explained". These two are great books. If you want design patterns in c#, go to this link, it's much more helpful than "design patterns in c# Workbook":
http://www.dofactory.com/Patterns/Patterns.aspx