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POUsing threads to count the loops in C# events
 

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    <p>EDIT: It is not a listbox. My mistake. It is a list view.</p> <p>I have a list view control that's driving me nuts. It is a multi-select list box, so if the user selects 5000 rows, then de-selects them by selecting a single row, the SelectedIndexChanged fires 5001 times. This causes my app to hang.</p> <p>I'm trying to use threads to count the number of times that the event WOULD have fired, and then letting the last iteration do all the actual work.</p> <p>Here's the code I started with. <b>The big catch:</b> I need the "do fancy calculations" to be in the same thread as the calling events due to items out of my control.</p> <p>EDIT: I <em>know</em> that this code doesn't work. The Join() blocks the current thread which negates the entire purpose of creating the thread. My question is : How do I do something LIKE this.</p> <p>My biggest problem isn't creating the thread. It's that my "do fancy" has to be in the same thread.</p> <p><code></p> <pre><code> void IncrPaintQueue() { PaintQueue++; Thread.Sleep(100); } int PaintQueue = 0; private void SegmentList_SelectedIndexChanged(object sender, EventArgs e) { // We need to know how many threads this may possibly spawn. int MyQueue = PaintQueue; // Start a thread to increment the counter. Thread Th = new Thread(IncrPaintQueue); Th.IsBackground = true; Th.Start(); Th.Join(); // if I'm not the last thread, then just exit. // The last thread will do the right calculations. if (MyQueue != PaintQueue - 1) return; // Reset the PaintQueue counter. PaintQueue = 0; // ... do fancy calculations here... } </code></pre> <p></code></p>
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    1. COWhat platform are you using? Is this a windows forms app?
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      1. USMatt Brunell
    2. COIt must not be winforms, because the ListBox control in windows forms does not behave as explained. Selecting a single item to deselect multiples only fires one SelectedIndexChanged event.
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      1. USMichael Meadows
    3. COYes. It is winForms. I made an edit to the article. Thanks for catching that.
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      1. USJerry
 

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