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POIn C#, wait on the mainthread while continuing to process UI updates? (.NET 2.0 CF)
 

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    <p>I want to otherwise block code execution on the main thread while still allowing UI changes to be displayed.</p> <p>I tried to come up with a simplified example version of what I'm trying to do; and this is the best I could come up with. Obviously it doesn't demonstrate the behavior I'm wanting or I wouldn't be posting the question. I just hope it gives some code context to back my poor explanation of the problem I'm hoping to solve.</p> <p>Within a button click handler on a form I have this:</p> <pre><code> private void button2_Click(object sender, EventArgs e) { AutoResetEvent autoResetEvent = new AutoResetEvent(false); new Thread(delegate() { // do something that takes a while. Thread.Sleep(1000); // Update UI w/BeginInvoke this.BeginInvoke(new ThreadStart( delegate() { this.Text = "Working... 1"; this.Refresh(); Thread.Sleep(1000); // gimme a chance to see the new text })); // do something else that takes a while. Thread.Sleep(1000); // Update UI w/Invoke this.Invoke(new ThreadStart( delegate() { this.Text = "Working... 2"; this.Refresh(); Thread.Sleep(1000); // gimme a chance to see the new text })); // do something else that takes a while. Thread.Sleep(1000); autoResetEvent.Set(); }).Start(); // I want the UI to update during this 4 seconds, even though I'm // blocking the mainthread if (autoResetEvent.WaitOne(4000, false)) { this.Text = "Event Signalled"; } else { this.Text = "Event Wait Timeout"; } Thread.Sleep(1000); // gimme a chance to see the new text this.Refresh(); } </code></pre> <p>If I didn't set a timout on the WaitOne() the app would deadlock on the Invoke() call.</p> <hr> <p>As to why I'd want to do this, I've been tasked with moving one subsystem of an app to do work in a background thread, but still have it block user's workflow (the main thread) only sometimes and for certain types of work related to that subsystem only.</p>
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