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To successfully implement the MVVM pattern, you need to fully understand the responsibilities of the view, model, and view model classes so that you can implement your application s code in the correct classes Implementing the correct patterns to allow these classes to interact (through data binding, commands, interaction requests, and so on) is also an important requirement Additionally, you should consider how the view, view model, and model classes are instantiated and associated with each other at run time Choosing an appropriate strategy to manage this step is especially important if you are using a dependency injection container in your application The Managed Extensibility Framework (MEF) and the Unity Application Block (Unity) both give you the ability to specify dependencies between the view, view model, and model classes and have them fulfilled by the container at run time.

equal = true; // Leave the try block. NOTE: C# doesn t offer a // leave keyword, so you have to goto a label. leave:; } catch (Exception) { } return equal; } }

Typically, you define the view model as a dependency of the view, so that when the view is constructed (by using the container) it automatically instantiates the required view model In turn, any components or services that the view model depends on will also be instantiated by the container After the view model is successfully instantiated, the view sets it as its data context With MEF, you can use the import attribute to specify the view s dependency on a view model, and you can use an export attribute to specify the concrete view model type to be instantiated You can use either a property or a constructor argument to import the view model into the view For example, the QuestionnaireView in the MVVM RI view declares a write-only property for the view model, together with an import attribute.

Summary

When the view is instantiated, MEF creates an instance of the appropriate exported view model and sets the property value The property setter assigns the view model as the view s data context, as shown in the following example..

Windows Small Business Server 2008 Administrator s Companion is divided into seven parts. The rst four roughly correspond to the developmental phases of a Windows Small Business Server network. Part 5 deals with Premium Edition features and Part 6 covers maintenance and troubleshooting. The last part is made up of appendices with helpful information.

The Security Application Block implements two related features It provides the capability to configure and manage sets of authorization rules using a variety of rule providers, and can help you to cache credentials for your application to use where it must make repeated authorization checks These two features combine to provide an environment for implementing authorization in a flexible way, while allowing the details of the authorization policies (the sets of rules) to be administered without requiring changes to the application eliminating the requirement to recompile, test, and redeploy the application as the policies change It also means that administrators can manage the policies using Group Policy if required In your application code, you can quickly and easily create tokens for users, cache these tokens, expire them, and check if users are authorized to perform specific tasks or operations.

When you run Microsoft Visual Studio 2010 and look in the Designer s Toolbox, you can see that ASP .NET includes three controls in the navigation category: Menu, TreeView, and SiteMapPath . This section looks at each in a bit more detail before diving into an example .

This is a book about PDF, not a book about Java, so we won t go into detail discussing the different geometry primitives and how to use them. That is all explained on SDN. Instead, we ll try to draw this complex shape to PDF as shown in the window to the right in figure 14.7.

These features make use of one or more authorization rule providers and security caches that you define for your application, and even use across multiple applications The following sections of this chapter explain what an authorization rule provider and a security cache are, and how they help you to implement a security strategy for your applications An authorization rule provider is a component or service that allows you to define rules Using a rule you specify a task or operation that users may perform, and you then allocate users and groups to this task or operation The Security block uses these rules to determine whether a specific user or role is authorized to execute a specified task or operation The Security block includes a rule provider that stores the information as a series of expressions, one for each task or operation, in the application configuration file.