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Figure 9-15. Silverlight Business template and Web site default files and folders You see the typical project layout for the Silverlight Navigation template with the Assets and Views folders along with App.xaml and MainPage.xaml. You also see the standard contents for a web project, including the output from a linked Silverlight application. The Silverlight Business Application project template adds a new folder named Services with two code files: AuthenticationService.cs and UserRegistration.cs. These two code files contain starter-service functionality typical in a LOB application for authentication, user profile information management, and user registration. The AuthenticationService.cs file represents a simple domain service for authentication in an RIA Services application. This item template includes two class instances based on classes provided by the WCF RIA framework in the System.ServiceModel.DomainServices.Server.ApplicationService namespace: AuthenticationBase implements a basic contract for authentication via a domain service. As you can see, the Silverlight Business project includes quite a bit of code. We don t go through it all here because it is automatically generated code but we provide some highlights on extensibility. Since the Business Application template leverages the ASP.NET services for authentication, profile, and role management, you can customize that functionality to work just like you can in ASP.NET. For example, you can customize authentication to use either Forms authentication or Windows authentication. In the Recipe 9-5 hidden folder Generated_Code, there is a file named Ch09_LOBApplications.Recipe9_5.Web.g.cs, which represents the code generated by WCF RIA Services for code in the web project marked with the attribute [EnableClientAccess]. When you open the Ch09_LOBApplications.Recipe9_5.Web.g.cs to review its contents, you see the WebContext singleton. If you take a look at this variable in IntelliSense, you see the list in Figure 9-16.

Figure 9-16. WebContext methods and properties Looking at the Authentication property, you can see that this is how you can access authenticationrelated information on the current user as shown in Figure 9-17.

2. Joel Spolsky, Advice for Computer Science College Students, published at www.joelonsoftware.com on January 2, 2005 (search for College Advice ).

Figure 9-17. Authentication property methods and properties The code Recipe9_5.WebContext.Current.User has methods and properties such as IsAuthenticated, a Roles collection, and an IsInRole method to implement role-based authorization. Again, if you are familiar with how this functionality works and is managed in ASP.NET, you are well prepared for implementing it in Silverlight. If this functionality is new to you, we highly recommend checking out the ASP.NET documentation. The rest of the template is focused on implementing basic building block UI based on the Silverlight Navigation Application template, which is discuss in Recipe 9-10.

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If the user types an illegal character, such as a number, an error message will be displayed on the right side of this field when the user clicks the mouse away from the field. In the seller s contact information form, each of the fields has a corresponding constraint component, as shown in Listing 6-15.

Take advantage of the Silverlight controls that enable codeless databinding in XAML such as the DomainDataSource control.

Although the application services (such as authentication, registration, and profile support) that the default Business Application template provides are very useful, WCF RIA Services are all about easily providing data to a Silverlight application. WCF RIA Services includes the DomainService class for the middle tier as covered in Recipe 9-2 and 9-3 so we will not repeat it. However, as quick background, we have an ADO.NET Entity Framework model for the Northwind database as well as a Northwind Data Service. In previous recipes, you performed all databinding in code. In this recipe, you leverage the DomainDataSource XAML control for the presentation tier to manage data flow in the application.

The first thing you do is open the Recipe 9-6 properties dialog and enable the WCF RIA Services link for the TestWeb project, save the project settings, and then recompile. Drag a DomainDataSource control and a DataGrid on to the MainPage canvas. You want to display customers from the Northwind database so you name them CustomersDomainDataSource and CustomersDataGrid, respectively. To connect the DomainDataSource to the Northwind Domain Service, you need to bring the NorthwindDomainContext into MainPage.xaml. You do this by adding a namespace: xmlns:NorthwindData="clr-namespace:TestWeb.DomainService" Next, add a resource on to the page to make the NorthwindDomainContext available in XAML and then configure your DomainDataSource and DataGrid as shown in Listing 9-3: Listing 9-3. The Recipe 9-6 MainPage.Xaml File <UserControl x:Class="Ch09_LOBApplications.Recipe9_6.MainPage" xmlns:dataControls= "clr-namespace:System.Windows.Controls;assembly= System.Windows.Controls.Data" xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk" xmlns:riaControls= "clr-namespace:System.Windows.Controls;assembly= System.Windows.Controls.DomainServices" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:NorthwindData="clr-namespace:TestWeb.DomainService" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="400"> <UserControl.Resources> <NorthwindData:NorthwindDomainContext x:Key="NorthwindDomainContext" /> </UserControl.Resources> <Grid x:Name="LayoutRoot" Background="White">

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