BackgroundWorker Component in WPF.pdf - Jeremy Bytes
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BackgroundWorker Component in WPF.pdf - Jeremy Bytes
Introduction to the. BackgroundWorker Component in WPF. An overview of the
BackgroundWorker component by JeremyBytes.com. The Problem. We've all ...
Introduction to the BackgroundWorker Component in WPF An overview of the BackgroundWorker component by JeremyBytes.com
The Problem We’ve all experienced it: the application UI that hangs. You get the dreaded “Not Responding” message, and you have to decide if you should wait it out or simply kill the process. If you have long-running processes in your application, you should consider putting them on a separate thread so that your UI remains responsive. However, threading is a daunting subject. We’ve heard horror stories about race conditions and deadlocks, and needing to use the thread dispatcher to communicate between background threads and the UI thread. At this point, it sounds like a subject best left to the experts.
The Solution Fortunately, the .NET framework provides a simple way to get started in threading with the BackgroundWorker component. This wraps much of the complexity and makes spawning a background thread relatively safe. In addition, it allows you to communicate between your background thread and your UI thread without doing any special coding. You can use this component with WinForms and WPF applications. We’ll be using it with WPF here. The BackgroundWorker offers several features which include spawning a background thread, the ability to cancel the background process before it has completed, and the chance to report the progress back to your UI. We’ll be looking at all of these features.
The Set Up We’ll start with a fairly simple WPF application that has a long-running process that blocks the application until it has completed. You can download the source code for the application here: http:// www.jeremybytes.com/Downloads.aspx. The download includes the starter application and the completed code. The starter application includes the following.
You can find the XAML for this in the download. It consists of 2 Text Boxes (Iterations and Output), a Progress Bar, and 2 Buttons (Start and Cancel). 2. A long running process (in the code-behind the form): private int DoSlowProcess(int iterations) { int result = 0; for (int i = 0; i
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