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Figure 18-17. The SQL statement hasn t been built because the code still hasn t iterated through items. When the code enters the foreach loop, the query is executed, as shown in Figure 18-18.

RIA Services builds on the capabilities covered in 7 to provide a framework that enables you to rapidly build Silverlight LOB n-tier applications. The challenge with n-tier applications is flowing data across application tiers with support for edits, validation, and so on. RIA Services provides a bridge between Silverlight 3 s rich presentation-tier capabilities and ASP.NET s powerful middle-tier capabilities on the server, including support for ASP.NET authentication and user settings management. You create classes in the middle-tier web application that inherit from the System.Web.DomainServices.DomainService base class to define a set of operations on resources such as an ADO.NET Entity Model or other resources such as a user registration service. Classes on the middle tier have the EnableClientAccess attribute, where desired and .NET RIA Services automatically generate the corresponding client-side code into the presentation tier (the Silverlight application). At this point, you can code against the generated client-side code without worrying about tracking and packaging up changes, and so forth, to pass back to the middle tier. .NET RIA Services manages this for you. Recipe 9-1 provides a detailed overview of the new project template and .NET RIA Services; we recommend starting there if you are new to .NET RIA Services. We have one other item to mention regarding LOB applications and the Bing Maps Silverlight control, which you can download here: https://connect.microsoft.com/silverlightmapcontrolctp wa=wsignin1.0 We do not provide a recipe that demonstrates the Bing Maps Silverlight control and how to integrate it into a LOB application because the control has not been updated since the Mix 09 release and by the time this book released it should be significantly different. Rob Cameron maintains a couple up-to-date of web casts at his blog that cover how to work with the Bing Maps Silverlight Control: http://blogs.msdn.com/RobCamer.

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Note If you are interested in implementing MVVM (Model-View-ViewModel) patterns on the client, performing

Figure 18-18. The SQL statement is built and the query is executed. There are pros and cons to the deferred query execution behavior provided by the LINQ to SQL framework. Since a query is not executed until its collection is enumerated, you can change the query in your code at runtime, perhaps depending on user input choices. That s a good point! But if you iterate through a collection s items over and over, then the SQL statement is executed several times, once for each iteration. That s not so good for performance. Moreover, you will not be able to determine

You need to create a Silverlight LOB application with application navigation, authentication, user settings, and error handling.

basic abstractions like this will allow you to remove code from the code-behind and place it in separate business objects that can be added 100 percent in XAML UI code.

whether the LINQ query you wrote is good until it is enumerated. You could write a query with good syntax but containing some logical error, which you will discover only after the query is executed. You can avoid executing a query repetitively using methods such as ToArray, ToList, ToDictionary, and ToLookup. For example, with the ToList method, you obtain a List<T> collection with data that will be cached by the LINQ to SQL framework. So, when you execute the same query again, the framework returns the cached data without running the query. The following code simulates a double query execution, and in Figure 18-19, you can see that the query is performed twice. AdventureWorksDataContext db = new AdventureWorksDataContext(); db.Log = Console.Out; IQueryable<CountryRegion> query = from r in db.CountryRegions select r; for (int i = 0; i < 2; i++) { foreach (CountryRegion region in query) { Console.WriteLine(region.Name); } }

Take advantage of Microsoft .NET RIA Services and the Silverlight Business Application template to build the foundation of a LOB application.

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