MCSD Certification Toolkit (Exam 70-483) by Tiberiu Covaci & Rod Stephens & Vincent Varallo & Gerry O'Brien

Author:Tiberiu Covaci & Rod Stephens & Vincent Varallo & Gerry O'Brien
Language: eng
Format: epub
Publisher: Wiley Publishing, Inc.
Published: 2013-04-21T16:00:00+00:00

The workflow of using the BackgroundWorker class is as follows:

1. Create a method that follows the DoWorkEventHandler signature.

2. In this method call the long-running operation. When the operation finishes, assign the result of the operation to the Result property of the DoWorkEventArgs parameter.

3. Create a BackgroundWorker instance.

4. Use the method you created on the first step to subscribe to the DoWork event.

5. Create a method that follows the RunWorkerCompletedEventHandler signature.

6. In this method, get the result of the long-running operation and update the UI.

7. Use this method to subscribe to the RunWorkerCompleted event so that your code knows when the long-running operation is completed. Before reading the result, you must make sure that your long-running operation did not throw an exception by checking the Error property of the RunWorkerCompletedEventArgs parameter. If the property is null, it means that no exception was thrown.

8. Optionally, create a method to be used to report progress, following the ProgressChangedEventHandler signature and subscribing this method to the ProgressChanged event.

9. Call the RunWorkerAsync method to start the background work.

10. If the work supports cancellation and you want to cancel the work, you can call the CancelAsync method.

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