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Compared to the validation attributes provided with the Validation block, there are some limitations when using the validation attributes from the DataAnnotations namespace: The range of supported validation operations is less comprehensive, though there are some new validation types available inNET Framework 40 that extend the range However, some validation operations such as property value comparison, enumeration membership checking, and relative date and time comparison are not available when using data annotation validation attributes There is no capability to use Or composition, as there is with the Or Composite validator in the Validation block The only composition available with data annotation validation attributes is the And operation You cannot specify rule sets names, and so all rules implemented with data annotation validation attributes belong to the default rule set There is no simple built-in support for self-validation, as there is in the Validation block.

Once IIS intercepts the request and maps it to the worker process, the request follows a very specific path through the pipeline . Later sections in look at each part of the pipeline in more detail . The outline of the request s path through versions of IIS earlier than 7 .x is this: . . . . . . . 1 . . The request lands in IIS . 2 . . IIS routes the request to aspnet_isapi .dll . a . . If IIS 5 .x is running, IIS asp_isapi .dll routes the request through a pipe to aspnet_wp .exe . b . . If IIS 6 .x is running, the request is already in the worker process . 3 . . ASP .NET packages the request context into an instance of HttpContext . 4 . . ASP .NET pipes the request through an instance of an HttpApplication object (or an HttpApplication-derived object) . 5 . . If the application object is interested in receiving any of the request preprocessing events, HttpApplication fires the events to the application object . Any HttpModules that have subscribed to these events will receive the notifications as well . 6 . . Runtime instantiates a handler and handles the request . Figure 2-1 shows how IIS version 5 .x and ASP .NET work together to handle HTTP requests . Figure 2-2 shows how IIS version 6 .x works with ASP .NET to handle requests .

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Another method of cross-module communication is through shared services. When the modules are loaded, modules add their services to the service locator. Typically, services are registered and retrieved from a service locator by common interface types. This allows modules to use services provided by other modules without requiring a static reference to the module. Service instances are shared across modules; therefore, you can share data and pass messages between modules. In the Stock Trader Reference Implementation (Stock Trader RI), the Market module provides an implementation of IMarketFeedService. The Position module consumes these services by using the shell application s dependency injection container, which provides service location and resolution. The IMarketFeedService is meant to be consumed by other modules; therefore, it can be found in the StockTraderRI.Infrastructure common assembly. However, the concrete implementation of this interface does not need to be shared; therefore, it is defined directly in the Market module and can be updated independently of other modules. To see how these modules register their services in the Unity Application Block (Unity) dependency injection container, see the MarketModule.cs file. The following code example is an excerpt from this file. The Position module s ObservablePosition receives the IMarketFeedService service through constructor dependency injection.

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You can, of course, include both data annotation and Validation block attributes in the same class if you wish, and implement self-validation using the Validation block mechanism in a class that contains data annotation validation attributes The validation methods in the Validation block will process both types of attributes For more information about data annotations, see http://msdnmicrosoftcom/en-us/ library/systemcomponentmodeldataannotationsaspx (NET Framework 35) and http:// msdnmicrosoftcom/en-us/library/systemcomponentmodeldataannotations(VS100) aspx (NET Framework 40) An Example of Using Data Annotations The examples we provide for this chapter include one named Using Data Annotation Attributes and Self-Validation This uses only the range of data annotation attributes in version 35 of the NET Framework, so you can run it on machines that do not have Visual Studio 2010 or version 40 of the NET Framework installed.

Understand the software patterns behind Model-View-Controller (MVC) . Understand how ASP .NET implements the MVC pattern . Create a functional MVC-based Web site .

C# MarketModule.cs protected void RegisterViewsAndServices() { _container.RegisterType<IMarketFeedService, MarketFeedService>(new ContainerControlledLifetimeManager()); //... }

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