Microsoft Silverlight 3: A Beginner s Guide in .NET framework

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Microsoft Silverlight 3: A Beginner s Guide
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Additional Threading Classes
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Most communication tasks are completed asynchronously, such as a call to a service or the use of the WebClient class However, occasionally code must complete a task that may be long running but should not interfere with user interface responsiveness Such a task should be carried out asynchronously using an additional thread Silverlight tasks can be performed on a separate thread by using the BackgroundWorker class The BackgroundWorker class performs a task on a secondary thread that executes in the background and is located in the SystemComponentModel namespace
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Complete a Time-Consuming Process Using the BackgroundWorker Class
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1 Start or open Visual Studio 2010 2 Create a new Silverlight 3 project 3 Design the Silverlight user interface to include a Button control and a TextBlock
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control The Button control will be clicked to perform a fictitious background process and then write a string to the Text property of the TextBlock control
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4 Create a Click event handler for the Button control 5 In the code-behind file, include the SystemComponentModel namespace by adding
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the following line of code to the using statement collection:
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using SystemComponentModel;
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6 Create an instance of the BackgroundWorker class as a class-level member, as shown
in the following line of code:
BackgroundWorker backgroundWorker = new BackgroundWorker ( );
7 In the page constructor, wire up event handlers for the DoWork event and the
RunWorkerCompleted event, as shown here:
public Page ( ) { InitializeComponent ( ); // wire up event handlers backgroundWorkerDoWork += new DoWorkEventHandler(backgroundWorker_DoWork);
10: Retrieving Server Resources
backgroundWorkerRunWorkerCompleted += new RunWorkerCompletedEventHandler(backgroundWorker_ RunWorkerCompleted); }
8 Write code for the DoWork event handler, as shown next The DoWork event handler
performs the actual background worker process
private void backgroundWorker_DoWork ( object sender, DoWorkEventArgs e ) { // do something time consuming SystemThreadingThreadSleep ( 500 ); }
9 Write code for the RunWorkerCompleted event handler The RunWorkerCompleted
event handler is executed after the DoWork event hander is complete The following RunWorkerCompleted event handler writes a string to the TextBlock control:
private void backgroundWorker_RunWorkerCompleted ( object sender, RunWorkerCompletedEventArgs e ) { // when done, report to the user thistbLabelText = "Done!"; }
10 Finally, write code in the Click event of the Button control to kick off the background
worker process by calling the RunWorkerAsync method, as shown here:
private void btnWriteLabel_Click ( object sender, RoutedEventArgs e ) { // kick off the background process when the button is clicked backgroundWorkerRunWorkerAsync ( ); }
The BackgroundWorker class can also be configured to report the progress of the process and to allow the process to be cancelled by the user Silverlight applications have access to additional, more advanced threading classes such as the Thread class and the ThreadPool class Threading classes are located in the SystemThreading namespace
Microsoft Silverlight 3: A Beginner s Guide
Additional Performance Tips
In addition to the techniques illustrated above, the following tips are recommended by Microsoft to further improve performance of Silverlight applications
Test on multiple platforms and browsers Set EnableFrameRateCounter to True during development Use the transparent background for a Silverlight plug-in sparingly When animating the opacity or transform of a UIElement, set its CacheMode While animating text, set TextRenderingMode to RenderForAnimation Avoid using Windowless mode Use Visibility instead of Opacity whenever possible In full-screen mode, hide unused objects Do not use Width and Height with MediaElement objects Do not use Width and Height with Path objects Break up CPU-intensive work into smaller tasks Break up large application packages Use DoubleToString(CultureInfoInvariantCulture) rather than DoubleToString()
Conclusion
A basic premise of creating an application that will execute in a client/server environment or over the Web is to minimize network traffic to improve performance To minimize network traffic, only data that is actually needed should be requested If 1,000 images exist on the server, but only a single image out of the 1,000 needs to be displayed, then only the single image should be requested from the server The WebClient class can be used to request a single file from a server or a packaged group of files
Debugging and Deploying Silverlight Applications
Microsoft Silverlight 3: A Beginner s Guide
Key Concepts & Skills
Learn about the types of errors that occur in software Gain an understanding of exceptions and exception handling Explore the Visual Studio 2010 debugger Observe how to deploy a Silverlight application to the Windows Live Silverlight Streaming Service and to a local web server
ebugging is a process that must be performed by all software developers Debugging can be skipped, but the quality and stability of the resultant application will be shaky and questionable, at best Silverlight is built on the same architecture as WPF and other NET Framework applications and has the full power of the Visual Studio debugger at its disposal Silverlight applications can also be easily deployed to a free service available from Microsoft or to any local web server
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