Pro WPF in C# 2008: Windows Presentation Foundation with .NET 3.5, Second Edition

The WPF Command Model

The WPF command model consists of a surprising number of moving parts. All together, it has four key ingredients:

• Commands. A command represents an application task and keeps track of whether it can be executed. However, commands don't actually contain the code that performs the application task.

• Command bindings. Each command binding links a command to the related application logic, for a particular area of your user interface. This factored design is important, because a single command might be used in several places in your application and have a different significance in each place. To handle this, you use the same command with different command bindings.

• Command sources. A command source triggers a command. For example, ...