Applications = Code + Markup: A Guide to the Microsoft Windows Presentation Foundation
This is an excellent book. It is all about code, code, more code, and then XAML, XAML, and more XAML. It does an excellent job of showing how all the new presentation features work at a code level.
Although there are a lot of new tools coming out that may keep a person from learning the code level details of WPF, I'd suggest learning the guts of how it works. If you are like me and like knowing how things work at a low level, this book will definitely teach you.
Every chapter is packed full of real world examples. The code that comes with the book is excellent.
If you want know WPF inside and out, you must read this book.
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.Essential Windows Workflow Foundation
This book is awesome. It explains the logic behind WWF, and why it is needed for long processing business logic.
Every chapter is very thorough and well written. If you want to learn all about WWF, this book is a must read.
The below points are from the back cover. The books covers all of these areas in an easy to read format and very thoroughly. I highly recommend reading this book!!!!!
The core concepts and ideas that form the heart of WF's programming model
The execution model for activities, with details of the activity automaton, bookmarking, scheduling, and the threading model of the WF runtime
Advanced execution concepts, including activity execution contexts, transactions, persistence points, passivation, fault handling, cancellation, compensation, and synchronization
Hosting the WF runtime in applications
The activity component model, with details of validation, compilation, serialization, and visualization
Databinding, XAML, dependency properties, and WF program metadata
Declarative conditions and rules, activity designers, and designer hosting
Custom control flow patterns ranging from simple sequencing and iteration to more complex graphs and state machines
Dynamic editing of running WF program instances
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