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MVVM

MVVM. Damon Payne Microsoft MVP Principal Architect – BigHammer Data. In the Beginning. Smalltalk MVC Split out (data)model, visual representation, and logic/event handling

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MVVM

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  1. MVVM Damon Payne Microsoft MVP Principal Architect – BigHammer Data

  2. In the Beginning • Smalltalk MVC • Split out (data)model, visual representation, and logic/event handling • Observer – “ Define a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically” • Command – “Encapsulate a request as an object”

  3. And Then there were more • Model View Presenter • Supervising Controller • Presentation Model (Screen Model) • http://martinfowler.com/eaaDev/PresentationModel.html

  4. Introducing MVVM • John Gossman, 2005 • http://blogs.msdn.com/b/johngossman/archive/2005/10/08/478683.aspx • Benefits and Goals: • Separate Concerns • Testability • Composition • No code behind! (or as little as possible)

  5. Actors

  6. Demo: MVVM Hello World • Let’s rebuild an all code-behind data-entry page • Data sources • Marshaling between screen and DTOs • Validation • Saving data • Some unit tests?

  7. Round 1 - Curiosities • Where do the ViewModels come from? • Dealing with command explosion • Starting Storyboards?

  8. Help With Async Models • Continue Passing • By default WCF runs on the Browser (UI) thread • Model-hydrating callbacks and async validation

  9. MVVM at Design time (Will it blend?) • Not the same as www.willitblend.com • Design time data • Behaviors

  10. Round 2 - Difficulties • How do we deal with Child Windows ? • Component Communication? • (We’ll defer this one till the end) • Parent-child models? • Recommend reusable editors be scoped to Model objects (Demo) • Complex command interactions

  11. Keep the Conversation Going (I’m lonely) • damon@damonpayne.com • http://www.silverlightarchitect.net • http://Feeds.feedburner.com/damonpayne • Twitter.com/damonpayne • Relevant articles: • View-Based Navigation

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