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Windows Presentation Foundation 4.5 Cookbook

You're reading from   Windows Presentation Foundation 4.5 Cookbook For C# developers, this book offers a fast route to getting more closely acquainted with the ins and outs of Windows Presentation Foundation. The recipe approach smoothes out the complexities and enhances learning.

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Product type Paperback
Published in Sep 2012
Publisher Packt
ISBN-13 9781849686228
Length 464 pages
Edition 1st Edition
Languages
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Author (1):
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Pavel Yosifovich Pavel Yosifovich
Author Profile Icon Pavel Yosifovich
Pavel Yosifovich
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Table of Contents (18) Chapters Close

Windows Presentation Foundation 4.5 Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
1. Foundations 2. Resources FREE CHAPTER 3. Layout and Panels 4. Using Standard Controls 5. Application and Windows 6. Data Binding 7. Commands and MVVM 8. Styles, Triggers, and Control Templates 9. Graphics and Animation 10. Custom Elements 11. Threading Index

Adding cancellation and progress with BackgroundWorker


The BackgroundWorker supports two extra features: cancellation and progress. We already looked at cooperative cancellation with the CancellationTokenSource and CancellationToken types, but the BackgroundWorker defines its own mechanism (it was created long before the latter types were).

In this recipe, we'll take a look at adding cancelation to the primes counting endeavor. Also, in a long running operation it's nice to indicate to the user how things are progressing. The BackgroundWorker has good support for that, too.

Getting ready

We'll continue with the CH11.AsyncCalcWithBackgroundWorker project. Alternatively, you can make a copy of it and work on that.

How to do it...

We'll add a Cancel button and a ProgressBar and use the support of BackgroundWorker for these features.

  1. Open MainWindow.xaml. Add a Cancel button to the second StackPanel, right after the Calculate button:

    <Button Content="Cancel" Padding="4" x:Name="_cancelButton" 
    ...
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