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Creating Applications using the
Model-View-ViewModel Pattern

              Matt Casto
        mattcasto@gmail.com
     http://twitter.com/mattcasto
Developing Software is HARD
Developing Software is HARD
Patterns Help … but its still HARD!
Model – View – ViewModel
Model – View – Controller
Model – View – Controller
   • Regarded as the first pattern to
     seperate UI, Data & Logic concerns
   • Controller handles all logic,
     including Mouse & Keyboard events
Model – View – Presenter
Model – View – Presenter
   • Variation of MVC
   • Tailored for modern UI that handles
     Mouse & Keyboard events better
   • Presenter depends on View
Presentation Model
Presentation Model
   • Published by Martin Fowler in 2004
   • View is a rendering of the
     Presentation Model
Presentation Model
“Probably the most annoying part of Presentation
Model is the synchronization between Presentation
Model and view. It’s simple code to write, but I always
like to minimize this kind of boring repetitive code.
Ideally some kind of framework could handle this,
which I’m hoping will happen someday with
technologies like .NET’s data binding.”
                                        – Martin Fowler
Model
Model – Your Data
Model – Your Data
   • Entities
   • Service Proxy
   • POCO
Model – Your Data
View
Model – Your Data
View – User Interface
Model – Your Data
View – User Interface
   • XAML (WPF)
   • XAML w/ Code Behind (Silverlight)
Model – Your Data
View – User Interface
ViewModel
Model – Your Data
View – User Interface
ViewModel – The View’s Model
Model – Your Data
View – User Interface
ViewModel – The View’s Model
   • State
   • Operations
   • Not Dependent on the View
You’re probably already doing
  something very close to this
You probably could be doing
 something very close to this
Why do I care about MVVM?
Why should you care about MVVM?
Patterns are a set of guidelines
 Patterns are not a set of rules
Benefits of MVVM
Benefits of MVVM

• Loose Coupling
• Testable Code
• Maintainable Code
Developers and Designers
DEMO

WPF vs Silverlight
DEMO

Adding Validation
DEMO

Unit Testing
DEMO

Commands
Enterprisey Solutions

• Component Application Guidance
• Caliburn
• Roll Your Own
Sources
• WPF Apps With The Model-View-ViewModel Design Pattern – Josh Smith
    http://msdn.microsoft.com/en-us/magazine/dd419663.aspx


• Model-View-ViewModel In Silverlight 2 Apps – Shawn Wildermuth
    http://msdn.microsoft.com/en-us/magazine/dd458800.aspx


• ViewModel Pattern in Silverlight using Behaviors – Nikhil Kothari
    http://www.nikhilk.net/Silverlight-ViewModel-Pattern.aspx


• Using RoutedCommands with a ViewModel in WPF – Josh Smith
    http://www.codeproject.com/KB/WPF/VMCommanding.aspx


• Presentation Model – Martin Fowler
    http://martinfowler.com/eaaDev/PresentationModel.html
THANKS!!


         Matt Casto
   mattcasto@gmail.com
http://twitter.com/mattcasto

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Creating Applications Using The Model-View-View Model Pattern