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Overview
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A design pattern refers to a reusable solution to a software design problem. Patterns have been used successfully in various industries for years. Applied to software, they enable us to apply tested development techniques to solve various problems that we encounter in software development. MVVM (which stands for Model-View-ViewModel) is one of those patterns; it separates what we see, the View, from how we get the data, our Model. The ViewModel is the glue that ties it all together.
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History of MVVM
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John Gossman, architect for Silverlight and WPF, came up with the MVVM pattern in 2005 as a way to leverage the Presentation Model (PM) pattern and apply it to the features in both WPF and Silverlight to simplify the creation of UIs. MVVM allows us to apply some basic UI patterns and take advantage of the great binding system in WPF and Silverlight. Microsoft is even using this pattern internally: Blend was created using MVVM, and the new version of Visual Studio. This separation allows for a much smoother workflow between designers and developers. The tooling coming out of Microsoft is starting to reflect this trend. Read more on the Presentation Model at http://martinfowler.com/eaaDev/PresentationModel. html. There are several benefits to using the MVVM development pattern: Independent development: Development of the View and the Model can be done independently and tied together with the ViewModel at a later time.
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Easier testing: Automated testing of the UI has always been rather difficult to perform and get right. Testing a ViewModel, which should contain all the interactions for a View, is easier because you are not dealing with any UI components. Multiple UIs: You can create multiple Views that take advantage of the same ViewModel for displaying information in different ways or for different users. Separation of responsibility: Everything is broken out and clearly defined. The View contains the Visuals for the application and consumes the ViewModel. The ViewModel glues the view and Model together. The Model contains all the interaction to retrieve and save data for the application.
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Data Binding, DataTemplates, and Commanding
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Data Binding allows us to bind properties from the ViewModel to our View. DataTemplates can be used to specify how items in a list should be viewed. Commanding can be used to wire up actions from your View to your ViewModel. Blend 4 adds some great new features to support MVVM. These include a project specifically for creating an MVVM-type application (Figure 15-1).
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MVVM: MODEL-VIEW-VIEWMODEL
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Figure 15-1. New project type in Blend supporting MVVM.
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Model
What is the Model part The Model represents the data that an application will use to populate the various views. It has the responsibility of getting the data from a web service, file system, or database. The Model also has the responsibility of presenting the data in a manner that is easily used by the ViewModel.
View
The View represents the UI portion of the pattern. The View binds to a ViewModel and displays the information for the user either to view or to edit. It represents the visual side of the Model. It defines all of your visual elements and bindings needed to tie our View and ViewModels together. You can also store any needed storyboards or animations in your View. It is common practice to set the DataContext of the View equal to an instance of your ViewModel. This can be done as a resource in XAML, or as a variable created in the code-behind. I have found it beneficial to have a 1:1 correspondence of View to ViewModel to begin with. If at a later date you need to change the visuals of your ViewModel, you can create a new View and take advantage of your existing ViewModel.
ViewModel
Finally, what is the ViewModel The ViewModel glues everything together. The View consumes the ViewModel for Data Binding and command execution (event execution from the UI). The ViewModel also
pushes data back to the Model for CRUD (Create, Read, Update, Delete) operations. The Model for this sample application will be created with sample data. The binding syntax in Silverlight allows us to tie the View and ViewModel together so that updates to the View are pushed to the Model without any extra coding we do this using two way bindings.
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