Pro WPF in C# 2010: Windows Presentation Foundation in .NET 4

32.6. The Last Word

In this chapter, you dove into the deeply layered add-in model. You learned how its pipeline works, why it works the way it does, and how to create basic add-ins that support host automation and provide visual content.

There's quite a bit more you can learn about the add-in model. If you plan to make add-ins a key part of a professional application, you'll want to take a closer look at specialized versioning and hosting scenarios and deployment, best practices for dealing with unhandled add-in exceptions, and how to allow more complex interactions between the host and add-in and between separate add-ins. To get the details, you'll need to visit the team blog for the Microsoft developers who created the add-in system at