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Decide whether Expression Blend design-time data support is important to your
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team. If you will use Expression Blend to design and maintain your UI and want to see design-time data, make sure that your views and view models offer constructors that do not have parameters and that your views provide a design-time data context. Alternatively, consider using the design-time features provided by Expression Blend by using design-time attributes such as d:DataContext and d:DesignSource. For more information, see Guidelines for Creating Designer Friendly Views in 7, Composing the User Interface.
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For more information about data binding in WPF, see Data Binding on MSDN: http://msdn.microsoft.com/en-us/library/ms750612.aspx. For more information about data binding in Silverlight, see Data Binding on MSDN: http://msdn.microsoft.com/en-us/library/cc278072(VS.95).aspx. For more information about binding to collections in WPF, see Binding to Collections in Data Binding Overview on MSDN: http://msdn.microsoft.com/en-us/library/ms752347.aspx. For more information about binding to collections in Silverlight, see Binding to Collections in Data Binding on MSDN: http://msdn.microsoft.com/en-us/library/cc278072(VS.95).aspx. For more information about the Presentation Model pattern, see Presentation Model on Martin Fowler s website: http://www.martinfowler.com/eaaDev/PresentationModel.html. For more information about data templates, see Data Templating Overview on MSDN: http://msdn.microsoft.com/en-us/library/ms742521.aspx. For more information about MEF, see Managed Extensibility Framework Overview on MSDN: http://msdn.microsoft.com/en-us/library/dd460648.aspx. For more information about Unity, see Unity Application Block on MSDN: http://www.msdn.com/unity. For more information about DelegateCommand and CompositeCommand, see 9, Communicating Between Loosely Coupled Components. To access web resources more easily, see the online version of the bibliography on MSDN: http://msdn.microsoft.com/en-us/library/gg405487(PandP.40).aspx.
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The previous chapter described how to implement the basic elements of the Model-ViewViewModel (MVVM) pattern by separating your application s user interface (UI), presentation logic, and business logic into three separate classes (the view, view model, and model), implementing the interactions between those classes (through data binding, commands, and data validation interfaces), and by implementing a strategy to handle construction, connection, and configuration of the MVVM classes. Implementing the MVVM pattern using these basic elements will probably support many of the scenarios in your application. However, you may encounter more sophisticated scenarios that require the basic MVVM pattern to be extended or that require more advanced techniques to be applied. This is more likely to be true if your application is large or complex, but you may also encounter these scenarios in smaller applications. The Prism Library provides components that implement many of these techniques, allowing you to more easily use them in your own applications. This chapter describes some sophisticated scenarios and how the MVVM pattern can support them. The next section explains how commands can be chained together or associated with child views and how they can be extended to support custom requirements. The following sections then describe how to handle asynchronous data requests and subsequent UI interactions and how to handle interaction requests between the view and the view model. The section, Advanced Construction and Configuration, contains guidance about handling construction, connection, and configuration when using a dependency injection container, such as the Unity Application Block (Unity), or when using the Managed Extensibility Framework (MEF). The final section describes how you can test MVVM applications by providing guidance on unit testing your application s view model and model classes, and on testing behaviors.
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Commands provide a way to separate the command s implementation logic from its UI representation. Data binding or behaviors provide a way to declaratively associate elements in the view with commands proffered by the view model. The Commands section in 5, Implementing the MVVM Pattern, described how commands can be
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implemented as command objects or command methods in the view model, and how they can be invoked from controls in the view by using either behaviors or the built-in Command property provided by certain controls. WPF Routed Commands: Commands implemented as command objects or command methods in the MVVM pattern differ somewhat from WPF s built-in implementation of commands named routed commands (Silverlight does not have any routed command implementations). WPF routed commands deliver command messages by routing them through elements in the UI tree (specifically, the logical tree). Therefore, command messages are routed up or down the UI tree from the focused element, or they are routed to an explicitly specified target element. By default, they are not routed to components outside of the UI tree, such as the view model associated with the view. However, WPFrouted commands can use a command handler defined in the view s code-behind file to forward the command call to the view model class.
In many cases, a command defined by a view model will be bound to controls in the associated view so that the user can directly invoke the command from within the view. However, in some cases, you may want to be able to invoke commands on one or more view models from a control in a parent view in the application s UI. For example, if your application allows the user to edit multiple items at the same time, you may want to allow the user to save all the items by using a single command represented by a button in the application s toolbar or ribbon. In this case, the Save All command will invoke each of the Save commands implemented by the view model instance for each item, as shown in the following illustration.
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