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To use a background worker thread, declare an instance of the BackgroundWorker class at the class level, not within an event handler: BackgroundWorker bw = new BackgroundWorker(); You can specify whether you want to allow cancellation and progress reporting by setting one or both of the WorkerSupportsCancellation and WorkerReportsProgress properties on the BackgroundWorker object to true The next step is to create an event handler for the BackgroundWorkerDoWork event This is where you put the code for the time-consuming operation Within the DoWork event, call the ReportProgress method to pass a percentage complete value that is between 0 and 100, which raises the ProgressChanged event on the BackgroundWorker object The UI thread code can subscribe to the event and update the UI based on the progress If you call the ReportProgress method when WorkerReportsProgress is set to false, an exception will occur.

Check the CancellationPending property of the BackgroundWorker object to determine if there is a pending request to cancel the background operation within the worker_DoWork member function If CancellationPending is true, set BackgroundWorkerCancel to true, and stop the operation To pass data back to the calling process upon completion, set the Result property of the DoWorkerEventArgs object that is passed into the event handler to the object or collection containing the data The DoWorkerEventArgsResult is of type object and can therefore be assigned any object or collection of objects The value of the Result property can be read when the RunWorkerCompleted event is raised upon completion of the operation The BackgroundWorker class tries to prevent deadlocks or cross-thread invocations that could be unsafe.

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Figure 12-12. The Learning Center s Resources section The more familiar you are with LinkedIn, the more helpful it can be to you, and the more you can help your friends. If you re familiar with LinkedIn, or you consider yourself a beginner but have read an article or book that you found helpful, I invite you to visit www.snspaces.com and post links, tips, tricks, or anything else you think would be helpful. Get a few Starbucks or a case of Jolt cola from eBay, and have at it!

This is because you might not consider the message granularity carefully, as it s derived from the method signature directly In contrast, defining the service contract first is more likely to lead to an efficient design Finally, the biggest reason for choosing the contract-last approach is its simplicity Exposing a Java class/interface as a web service doesn t require you to know much about XML, WSDL, SOAP, and so on You can expose a web service very quickly..

There are some calls that are always assumed to be called on the UI thread, such as calling into the HTML Document Object Model (DOM) or a JavaScript function, so you are not allowed to call them from a BackgroundWorker class A deadlock occurs when two threads each hold on to a resource while requesting the resource that the other thread is holding A deadlock will cause the browser to hang It is easy to create a deadlock with two threads accessing the same resources in an application Silverlight includes locking primitives, such as Montior or lock, as well as the ManualResetEvent class Exceptions must be caught within the background thread, because they will not be caught by the unhandled exception handler at the application level.

To begin, go to www.linkedin.com, and join LinkedIn. Enter your first and last name and your e-mail address, and come up with a password, as shown in Figure 12-13. Then, click Join Now.

If an exception occurs on the background thread, one option is to catch the exception and set Result to null as a signal that there was an error Another option is to set a particular value to Result as a signal that a failure occurred..

Because Web Services is a standard and cross-platform application communication technology, you want to expose a web service from your Java application for clients on different platforms to invoke.

You want to display some timed content, such as a closed caption, subtitles, or a commercial, at certain points while your media is playing.

Figure 12-13. Joining LinkedIn LinkedIn helps you to fill in your profile, as shown in Figure 12-14.

Add markers to the video either through pre-encoding or at runtime, and respond to MediaElement events to display your content when markers are reached.

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