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POMethod accessed by more than one thread in C# Using Progressbar
 

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    <p>I have multiple threads accessing a method. </p> <p>That method updates the progress bar on the form as the threads execute.</p> <p>That method updates the progress bar on my windows form showing the progress of the processed files as the threads are completing them. </p> <p>How would you go about managing that method to avoid deadlocks. Im having trouble locking it, dont know if im doing it wrong, or if i should lock it in this case.</p> <pre><code>public void myWorkerClass() { int amountToScan = 4; lblcount.BeginInvoke( ((Action)(() =&gt; lblcount.Text = "Files Checked " + atPDFNumber.ToString() + " of " + amountToScan.ToString()))); decimal percentageComplete = ((decimal)atPDFNumber / (decimal)amountToScan) * 100; backgroundWorker1.ReportProgress((int)percentageComplete); } </code></pre> <p>What happens is, that at the last line, it breaks telling me that "This operation has already had OperationCompleted called on it and further calls are illegal."</p> <p>I take it that im opening something that has already been disposed by the first thread or something like that.</p> <p>Is this a good way to go about using the progress bar with multiple threads (do i have the right idea or principle), or is there just a small error in my code?</p> <p>How I want to make this question valuable for other people is to answer with this question how global variables can be accessed inside a method that's being accessed by multiple threads. since i take it thats the direction this question is going in.</p>
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    1. COI think you need to make a delegate for your Progress Bar object, like you would if you have multiple threads updating a listbox in a form.
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    2. COYou are calling ReportProgress on a background worker that isn't doing any work anymore. Using a hard reference to backgroundWorker1 *and* having more than one thread can never be correct.
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    3. COSo you saying that having multiple theads isnt a good idea? why not? and @ Derek, looking up Delegates now
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