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POWPF / XAML: How do I execute threaded processes and prevent the main UI from being busy / freezing?
 

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  1. POWPF / XAML: How do I execute threaded processes and prevent the main UI from being busy / freezing?
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    <p>I have a XAML application that serves as the UI for an automation. The entire automation can take anywhere from 20-30 hours to fully execute so I created a Task class object that essentially wraps Thread methods (Start/Stop/Reset).</p> <p>However, when I run the automation method under the Task object, the XAML UI is busy and I cannot interact with the other controls, including the Pause button which toggles the Thread.Set() flag.</p> <p>There is another post <a href="https://stackoverflow.com/questions/1644874/prevent-ui-from-freezing-without-additional-threads">Prevent UI from freezing without additional threads</a></p> <p>where someone recommended the BackgroundWorker class this MSDN article mentions it is a bad idea to use this when if it manipulates objects in the UI, which mine does for purposes of displaying status counts: <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker.aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker.aspx</a></p> <p>Any idea around this?</p> <pre><code> private void OnButtonStartAutomationClick(object sender, RoutedEventArgs e) { btnPauseAutomation.IsEnabled = true; Automation.Task AutomationThread = new Automation.Task(RunFullAutomation); } private void RunFullAutomation() { // do stuff that can take 20+ hours // threaded so I can utilize a pause button (block) } class Task { private ManualResetEvent _shutdownFlag = new ManualResetEvent(false); private ManualResetEvent _pauseFlag = new ManualResetEvent(true); private Thread _thread; private readonly Action _action; public Task(Action action) { _action = action; } public void Start() { ThreadStart ts = new ThreadStart(DoDelegatedMethod); _thread = new Thread(ts); _thread.Start(); _thread.Priority = ThreadPriority.Lowest; } public void Resume() { _pauseFlag.Set(); } public void Stop() { _shutdownFlag.Set(); _pauseFlag.Set(); _thread.Join(); } private void DoDelegatedMethod() { do { _action(); } while (!_shutdownFlag.WaitOne(0)); } } </code></pre>
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    1. COOn a side note - I'd recommend not making a class named `Task`, as it conflicts with the framework's Task class: http://msdn.microsoft.com/en-us/library/system.threading.tasks.task.aspx
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      1. POWPF / XAML: How do I execute threaded processes and prevent the main UI from being busy / freezing?
      1. USReed Copsey
 

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