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CHAPTER 7 DATA ACCESS AND NETWORKING
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11. Save the MainPage.xaml file and navigate to the code behind for the application, located in the MainPage.xaml.cs file. Wire up the Loaded event handler for the page, as follows: public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); this.Loaded += new RoutedEventHandler(Page_Loaded); } void Page_Loaded(object sender, RoutedEventArgs e) { throw new NotImplementedException(); } } Next, you need to call the WCF service. In Silverlight, web services can be called only asynchronously, so the browser s execution is not blocked by the transaction. In order to do this, you need to get an instance of the service reference (commonly referred to as the web service proxy class) named StartingHandService, which you added earlier. You will then wire up an event handler for the service s GetHandsCompleted event, which you examined in the Object Browser (in step 11). This is the event handler that will be called when the service has completed execution. Finally, you will execute the GetHandsAsync() method.
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Tip In a real-world scenario, you will want to present the user with a progress bar or animation while the service is being called, since the duration of a web service call can be lengthy.
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12. Within the Page_Loaded event handler, first obtain an instance of StartingHandService. Then, in the GetHandsCompleted event handler, bind the ItemsSource of the DataGrid to the result returned from the service call, as shown in the following code. Note that normally you will want to check the result to make certain that the web service call was successful, and alert the user accordingly in case of failure. using WCFService.StartingHandServiceReference; ...
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CHAPTER 7 DATA ACCESS AND NETWORKING
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public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); this.Loaded += new RoutedEventHandler(Page_Loaded); } void Page_Loaded(object sender, RoutedEventArgs e) { StartingHandServiceClient service = new StartingHandServiceClient(); service.GetHandsCompleted += new EventHandler<GetHandsCompletedEventArgs>( service_GetHandsCompleted); service.GetHandsAsync(); } void service_GetHandsCompleted(object sender, GetHandsCompletedEventArgs e) { this.grdData.ItemsSource = e.Result; } } 13. Test your application. If all goes well, you should see the populated DataGrid, as shown earlier in Figure 7-1. This example demonstrated how to use the Silverlight-enabled WCF service provided in Visual Studio to allow your Silverlight application to access data remotely. As noted earlier in chapter in the section Data Access in Silverlight Applications , this is one of the most common approaches to data access with Silverlight.
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In the previous example, the web service was on the same domain as your Silverlight application. What if you want to call a service that is on a different domain In fact, as a best practice, it is preferred to have your web services stored on a domain separate from your web application. Even for applications where you control both the web service and the Silverlight application, you may be dealing with different domains. If you attempt to access a service from a different domain in Silverlight, you will notice that it fails. This is because, by default, a Silverlight application cannot call services that are on a different domain, unless it is permitted to do so by the service host. In order for Silverlight to determine if it has permission to access a service on a certain domain, it will look for one of two files in the root of the target domain: clientaccesspolicy.xml or crossdomain.xml. First, Silverlight will look for a file named clientaccesspolicy.xml in the domain s root. This is Silverlight s client-access policy file. If you are publishing your own services that you want to be accessible by Silverlight applications, this is the file that you want to use, as it provides the most options for Silverlight application policy permissions. The following is a sample clientaccesspolicy.xml file:
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