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As you’ve seen, writing a dependent property is simple; just put the business logic into the get method.But writing an independent property takes one additional step.Creating these sentries is all you need to do, but you need to do it for every independent property.To help you write this extra code, Update Controls installs a Visual Studio add-in that shows up in the Tools menu as “Generate Independent Properties”.Update Controls is an open source library that replaces event-based data binding with automatic discovery and updating. WPF data binding requires that a bindable class implement the INotify Property Changed interface.This interface is fairly easy to implement as it requires only a single event: Property Changed.This event is to be fired every time one of the properties is changed.The problem with this interface is in the code that consumes it.
Listing 3 shows the Current Customer property as an example.Whereas INotify Property Changed forces you to write bookkeeping code for intermediate logic, Update Controls makes it trivial.Because of this, Update Controls simplifies patterns that are much more cumbersome using INotify Property Changed.By day, Michael is a solutions architect at Amerisource Bergen Specialty Group where he delivers high quality enterprise software in . By night, he writes mobile applications in Java for the Andriod platform.
He blogs his discoveries along the way at Adventures In Software (In either case, the goal is separation of concerns.