It's just an introduction to MVVM framework

1. Introduction to MVVM In Silverlight Honeyson Joseph D http:/facebook.com/honeydev 1 http:/facebook/honeydev

3. Also known as Presentational Model.

4. Model-View-ViewModelpattern is similar to MVC2 http:/facebook/honeydev

6. Still using widely, especially with ASP.NET MVC.3 http:/facebook/honeydev

8. The controller has lot of responsibilities.

9. Testing a View is very difficult and time consuming.4 http:/facebook/honeydev

11. Viewis more active and pushing information to the Model.

12. The interactions is done via Data Binding.5 http:/facebook/honeydev

13. 6 http:/facebook/honeydev

14. Model Model represents the business domain which includes the model classes used (Customer, Order, etc.), data access code and business rules. 7 http:/facebook/honeydev

15. View Viewin MVVM represents the screens that we build. Includes : 1.XAML files 2.code-beside files Responsibilities : 1.displaying data 2.collecting data from end users View isn't responsible for retrieving data, performing any business rules or validating data 8 http:/facebook/honeydev

16. ViewModel ViewModel acts as middle-man between View and Model Responsibilities : Aggregating and storing data that will be bound to a View 9 http:/facebook/honeydev

18. Messages10 http:/facebook/honeydev

19. Helpers around MVVM…cont View might need to notify the ViewModelabout something happened in the View. eg: a control being clicked. ViewModelneed to notify to the View when something happen. For these we use Events, another good way is to use Messages. 11 http:/facebook/honeydev

22. Messenger

23. ViewModelBase. Also 1. EventToCommandwhich can be used to get rid of annoying WPF and SL Command binding limitations. 2. DispatcherHelperfor multi-threaded applications. 12 http:/facebook/honeydev

24. For Example Step 1 VIEW Button Base.Command connects view with ViewModel (GetPersonreturntype is Icommand—comand object)- following Commn design pattern VIEW Model PersonViewModelcontructor connects to PersonModel 13 http:/facebook/honeydev

25. Model Property changed event results in UI updates – from context (two way binding) 14 http:/facebook/honeydev

26. References: http://weblogs.asp.net/dwahlin/archive/2009/12/08/getting-started-with-the-mvvm-pattern-in-silverlight-applications.aspx http://www.silverlight.net/learn/tutorials/silverlight-4/using-the-mvvm-pattern-in-silverlight-applications/ http://www.astaticstate.com/2010/04/silverlight-4-using-mvvm-patter-ria.html Go on more, share your knowledge that help to others including me……………THANK YOU ! 15 http:/facebook/honeydev