Scott Hanselman

Hanselminutes Podcast 241 - The MVVM Pattern with Laurent Bugnion

November 19, '10 Comments [2] Posted in Open Source | Podcast | Silverlight | WPF
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Scott talks to Laurent Bugnion about the often misunderstood Model-View-ViewModel (MVVM) pattern. What's the different between this pattern and MVC? Can I use this pattern for Silverlight, WPF and Windows Phone 7, and what Open Source projects can support this pattern?

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Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, consultant, father, diabetic, and Microsoft employee. He is a failed stand-up comic, a cornrower, and a book author.

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Sunday, November 21, 2010 9:27:57 AM UTC
A conceptual but seemingly overlooked difference between MVC as implemented in popular web frameworks and MV* in client apps is that in the former case the controller/presenter is remote, while in client apps it is local.

A web version of MVVM would have the view model running in the browser, exposing javascript "commands"/functions, talking to the server via async calls and keeping the view (html/css) in sync as values change.

However, it seems as if ASP.NET MVC and friends encourage "fat" views that mix together visual presentation and presentation layer logic.
Monday, November 22, 2010 8:17:52 PM UTC
Great podcast guys!

Another thing about Value Converters is that they are reusable where code inside a ViewModel is not. An example I use all the time is Boolean to Brush converter. I define TrueBrush and FalseBrush properties in my converter class and populate them in the XAML, so the colors can be different in each instance, but the action is the same. Now I can reuse that converter in many places and applications. If I had to code that in every ViewModel it wouldn't be very DRY. Plus, defining a Brush in code is no fun: this way you can use simple text in the XAML file.
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Disclaimer: The opinions expressed herein are my own personal opinions and do not represent my employer's view in any way.