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THREADING IN SILVERLIGHT
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(Convert.ToInt32(timerOutputText.Text) + 1).ToString(); }); } Since the work method happens on a different thread, the Dispatcher must be used to make changes to the user interface. A button on the user interface is again hooked up to a method that starts/stops the timer: private void timerButton_Click(object sender, RoutedEventArgs e) { if (threadTimer != null) { threadTimer.Change(0, Timeout.Infinite); timerButton.Content = "Start Timer"; } else { if (threadTimer != null) threadTimer.Change(Convert.ToInt32(dueTimeTextBox.Text) * 1000, Convert.ToInt32(periodTextBox.Text) * 1000); else threadTimer = new Timer(new TimerCallback(doSomething), null, Convert.ToInt32(dueTimeTextBox.Text) * 1000, Convert.ToInt32(periodTextBox.Text) * 1000); timerButton.Content = "Stop Timer"; } } You instruct the timer to stop by setting the period to Timeout.Infinite. The Change method is used to restart the timer also. This is the only way to interact with the Timer after it has been created, except for destroying it via Dispose.
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Summary
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When the .NET Framework is a back-end platform for Silverlight, the multi-threading support is provided by Silverlight. Although you can manually create and use threads, it s much better to either leverage the thread pool or use the BackgroundWorker class to do work on a thread other than the main application thread. You also saw two timers provided by Silverlight: the DispatcherTimer and the Timer from the System.Threading namespace. In the next chapter, we will look at the Silverlight support for dynamic languages such as IronRuby and IronPython.
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C H A P T E R 13
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WCF RIA Services and Silverlight for Mobile
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The Silverlight platform is meant to provide a technology platform to develop and deploy platform- and device-agnostic and enterprise-level line-of-business rich Internet applications. So far you have learned basic and advanced features and capabilities to develop Silverlight RIAs. This chapter provides you with the following: A high-level overview of the newly introduced capabilities in Silverlight 4, including WCF RIA Services (previously known as .NET RIA Services) to truly develop n-tier enterprise-level business applications Extended support of Silverlight on the Windows Mobile 7 platform to develop Silverlight-based applications for Windows mobile devices
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Note that one chapter is not sufficient to cover all aspects of WCF RIA Services for Silverlight and Silverlight for the Windows Mobile 7 platform in detail. This chapter is intended to introduce these capabilities at a very basic level to give you a quick start.
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Usually business applications are data-driven and need to support different types of business logic supporting CRUD operations in a secured role-based application environment. It is also important to keep the application logic independent to the data platform and application presentation layer. Efficient coordination of application logic between client and server sides, for any n-tier RIA application, is critical to avoid redundancy of the application logic at the client side (presentation layer level) and the server side. In 11, we learned about the Model View ViewModel (MVVM) design pattern and demonstrated how ViewModel (in the MVVM pattern) can encapsulate the application behavior independent to View, and how to leverage data-binding and commanding to bind the View to its ViewModel. WCF RIA Services is intended to provide framework components and services as building blocks, and design and development tools and templates (for Visual Studio) to develop the server-side application logic, and, based on the implemented server-side application logic, manage and maintain the Silverlight client-side application logic without you maintaining it manually. With the help of WCF RIA Services and Visual Studio, you can develop a single solution containing the server- and client-side projects and generate and maintain the application logic code for the RIA client automatically based on the implemented middle-tier server-side application logic. WCF RIA Services also provides out-of-the-
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WCF RIA SERVICES AND SILVERLIGHT FOR MOBILE
box common security services for form-based authentication, roles, and profile management. Figure 131 provides a high-level overview of an n-tier rich Internet application and the role of WCF RIA Services.
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