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

23.2. Window Interaction

In Chapter 7, you considered the WPF application model, and you took your first look at how windows interact. As you saw there, the Application class provides you with two tools for getting access to other windows: the MainWindow and Windows properties. If you want to track windows in a more customized way—for example, by keeping track of instances of a certain window class, which might represent documents—you can add your own static properties to the Application class.

Of course, getting a reference to another window is only half the battle. You also need to decide how to communicate. As a general rule, you should minimize the need for window interactions, because they complicate code unnecessarily. If you do need to ...