ADVANCED SILVERLIGHT FEATURES in Visual Basic .NET

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NetworkAddressChangedEventHandler (NetworkChange_NetworkAddressChanged); Now define both event handlers, and call the UpdateNetworkConnectivityStatus method, as shown in the following code snippet: void MainPage_Loaded(object sender, RoutedEventArgs e) { UpdateNetworkConnectivityStatus(); } void NetworkChange_NetworkAddressChanged(object sender, EventArgs e) { UpdateNetworkConnectivityStatus(); } Save, build, and then run the application. You should see the start-up connected or disconnected status with cyan or red fonts in the browser. When you change the network connectivity state while running the application, the connectivity state will be automatically reflected in the application. If you install the application as an out-of-browser application and run it, you should see the same network connectivity status update behavior! Isn t it amazing Now let s update the application running status with the use of the ApplicationServiceContext.IsRunningOutOfBrowser property. Add a new UpdateApplicationModeStatus method, as shown here, which will utilize the ApplicationServiceContext.IsRunningOutOfBrowser property: private void UpdateApplicationModeStatus() { if (App.Current.IsRunningOutOfBrowser) { txtAppMode.Text = "Out of Browser"; txtAppMode.Foreground = new SolidColorBrush(Colors.Yellow); } else { txtAppMode.Text = "In Browser"; txtAppMode.Foreground = new SolidColorBrush(Colors.Yellow); } } Now call this method from the existing Loaded event of the MainPage to update the application mode. If you run the application, you will see that the status is updated based on the network connection and application mode. Figure 11-13 shows the application running in in-browser mode with different versions for the network connection status.
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Figure 11-13. Silverlight application running in in-browser mode with different versions for the network connectivity states Figure 11-14 shows the application running in out-of-browser mode with different versions for the network connection status.
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Figure 11-14. Silverlight application running in out-of-browser mode with different versions for the network connectivity states
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The next logical question that may come to your mind is, If the application is updated and you are running in out-of-browser mode, how would the user be notified of the availability of the new version of the application Here you can use CheckAndDownloadUpdateAsync, which basically checks for and retrieves the available update for the installed out-of-browser application. You can then handle the Application.CheckAndDownloadUpdateCompleted event. In the event handler the UpdateAvailable property value is true if a newer version of your application is discovered and successfully downloaded. In this case, you can alert the user to restart in order to load the update. In the case where an application update requires a newer version of Silverlight than the currently installed version on the client machine, the update will not be downloaded. Partially trusted applications will not be updated when an update requires elevated trust. In both cases, the UpdateAvailable property value is false, and the Error property value is an Exception instance. With a Silverlight version change, the exception is a PlatformNotSupportedException instance. With a security change, the exception is a SecurityException instance. When this happens, you can alert the user to open the application s host web site and reinstall the application from there. In the case of trusted out-of-browser applications, this update mechanism will not work unless the application and the update have both been signed with the same valid, code-signing certificate (see
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15). To update a trusted application that does not have a valid signature, users must uninstall the old version and install the new version manually. Let s add a button just after the txtAppMode textblock in MainPage.xaml (see Figure 11-15) to demonstrate the application update process. <Button Height="26" Margin="15,0,0,0" x:Name="btnCheckUpdate" Click="btnCheckUpdate_Click">Check for Update</Button> The code for the btnCheckUpdate_Click event handler is as follows: private void btnCheckUpdate_Click(object sender, RoutedEventArgs e) { App.Current.CheckAndDownloadUpdateCompleted += new CheckAndDownloadUpdateCompletedEventHandler (Current_CheckAndDownloadUpdateCompleted); App.Current.CheckAndDownloadUpdateAsync(); } The code for the CheckAndDownloadUpdateCompleted event handler is simple and just notifies the user about the update status of the application. void Current_CheckAndDownloadUpdateCompleted (object sender, CheckAndDownloadUpdateCompletedEventArgs e) { if (e.UpdateAvailable) { MessageBox.Show("An application update has been downloaded. " + "Restart the application to run the new version."); } else if (e.Error != null && e.Error is PlatformNotSupportedException) { MessageBox.Show("An application update is available, " + "but it requires a new version of Silverlight. " + "Visit the application home page to upgrade."); } else { MessageBox.Show("There is no update available."); } } Figure 11-15 shows the resultant output with the custom application update availability option.
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