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UnhandledException event makes it convenient to implement centralized error handling and error reporting for a Silverlight application The ApplicationUnhandledException event cannot handle exceptions that originate from the Silverlight platform code (ie, the plug-in itself) Platform code exceptions as well as exceptions that are not handled with the UnhandledException event are passed to the native/unmanaged error handler in the Silverlight plug-in To handle exceptions at this level, implement a JavaScript OnError event handler in the Silverlight plug-in To implement the OnError event handler, create a JavaScript event handler that follows this signature: function onSLError(sender, args) { //error handling logic goes here } For an example of how to implement an OnError JavaScript handler, look no further than any one of the HTML or aspx test pages that are automatically generated by the Visual Studio 2010 project template.

Inside the HTML <script> tag is a function called onSilverlightError that implements basic error handling for the test page Further down in the HTML or aspx page, in the <object> tag for instantiating the Silverlight plug-in, the onerror parameter is passed a value of onSilverlightError: <param name="onerror" value="onSilverlightError" /> There isn t any code for this recipe, since Visual Studio 2010 generates most of the sample code for you as part of the project template Refer to the generated aspx and HTML files for code examples on where to manage exceptions..

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You need to execute work in the background that provides updates on progress so that the UI can be responsive.

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Silverlight 4 includes the SystemThreadingThread and SystemThreadingThreadPool classes as part of the NET Framework for Silverlight However, we recommend that you instead use the SystemComponentModelBackgroundWorker class to execute work in the background of the UI, such as loading or saving data to isolated storage, accessing a remote service, etc The BackgroundWorker class provides a nice abstraction layer over the gory details of safely synchronizing with the UI thread when using one of the lower-level classes like Thread and ThreadPool The BackgroundWorker class lets you indicate operation progress, completion, and cancellation in the Silverlight UI For example, you can check whether the background operation is completed or canceled and display a message to the user.

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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