I gave a talk today at the NOVA Code Camp on the MVVM pattern in WPF and Silverlight.

Some of the key highlights and takeaways are:

• MVVM is based on the Presentation Model pattern
• MVVM is all about separation of concerns and loose coupling
• The ViewModel’s responsibility is to offer up state to the view in the way the view wants to see it
• The ViewModel contains and manipulates state
• View.DataContext = ViewModel is the relationship between view and ViewModel
• The View data binds properties on elements to properties on the ViewModel
• The View elements fire commands via data bindings on command properties on the ViewModel to manifest behavior in the ViewModel
• Parent ViewModels can contain child ViewModels to allow the views to compose via DataTemplates
• ViewModels can contain logic that manipulates the state including loading/updating state, validating state, computing values, and other kinds of logic that is not readily accessible in the model

A good source of info and examples on MVVM is the upcoming Prism 4 release, which already has public drops that include the MVVM QuickStart and a future drop will contain a more complicated MVVM Reference Implementation (bigger sample).

You can grab the slides and demos here:   Slides    Demos

Saturday, June 12, 2010 8:05:12 PM (GMT Standard Time, UTC+00:00)
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