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POSynchronizationContext.Post not working inside BackgroundWorker
 

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  1. POSynchronizationContext.Post not working inside BackgroundWorker
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    <p>I'm using a background-worker to do all of my processing. Inside there, I have many places where I write to my "log" text box. All of those work great, but at the end of the background-worker, the very last line, I have one more call via <code>SynchronizationContext</code> that doesn't fire. Why do all of the other calls work, and not the last one?</p> <p>I should add that the application just "hangs", and there's even an EventLog entry saying:</p> <pre> The program MVST.CodeSync.exe version 2.0.0.0 stopped interacting with Windows and was closed. To see if more information about the problem is available, check the problem history in the Action Center control panel. Process ID: 1f5c Start Time: 01ccc0e2e7ca1d42 Termination Time: 16 Application Path: C:\Users\ganders\Desktop\NewCodeSync\MVST.CodeSync.exe Report Id: 629f3533-2cd6-11e1-9e15-005056b75254 </pre> <p>Here's the <code>DoWork</code> method (which is executed when calling <code>RunWorkerAsync</code>):</p> <pre><code>private void bgw_StartCompare(object sender, DoWorkEventArgs e) { OnWriteLogArgs args = null; CompareData compareData = e.Argument as CompareData; // We need to iterate through all of the nodes and if they are checked, continue foreach (TreeNode subSystemNode in compareData.TreeNodes) { if (!subSystemNode.Checked) continue; args = new OnWriteLogArgs(String.Format("-------------------------- Comparing sub-system: \"{0}\" with CompareType: \"{1}\" --------------------------", subSystemNode.Text, compareData.CompareType)); syncContext.Post(delegate { OnWriteLog(args); }, null); // Each of these nodes should be a server, so continue foreach (TreeNode serverNode in subSystemNode.Nodes) { if (!serverNode.Checked) continue; args = new OnWriteLogArgs(String.Format("-------------------------- Comparing server: \"{0}\" with CompareType: \"{1}\" --------------------------", serverNode.Text, compareData.CompareType)); syncContext.Post(delegate { OnWriteLog(args); }, null); // The "tag" contains the server information that we need to do the comparison CustomConfig.Server server = (CustomConfig.Server)serverNode.Tag; if (!compareData.DoneInitialCompare) CompareAll(compareData, server, string.Empty, server.CompareBasePath, serverNode, compareData.CompareType); else CompareAllByTreeNode(compareData, server, serverNode, compareData.CompareType); } } syncContext.Post(delegate { OnWriteLog(new OnWriteLogArgs("Finished the compare...")); }, null); RebuildTreeViewArgs rArgs = new RebuildTreeViewArgs(compareData.OnlyShowDifferences, compareData.TreeNodes); syncContext.Post(delegate { OnRebuildTreeView(rArgs); }, null); MessageBox.Show("It made it..."); syncContext.Post(delegate { OnWriteLog(new OnWriteLogArgs("Finished calling the rebuild tree view method...")); }, null); } </code></pre> <p>You'll notice at the end of the <code>foreach</code> loop, I do my write that says <code>Finished the compare...</code>, and that DOES write, but the next sync call:</p> <pre><code> syncContext.Post(delegate { OnRebuildTreeView(rArgs); }, null); </code></pre> <p>Never gets executed. Here's that method:</p> <pre><code>private void OnRebuildTreeView(RebuildTreeViewArgs args) { syncContext.Post(delegate { OnWriteLog(new OnWriteLogArgs("Made it to the OnRebuildTreeView method...")); }, null); while (bgw.IsBusy) { syncContext.Post(delegate { OnWriteLog(new OnWriteLogArgs("Sleeping...")); }, null); Thread.Sleep(1000); } syncContext.Post(delegate { OnWriteLog(new OnWriteLogArgs("Starting the rebuild of the TreeView...")); }, null); TreeNode[] tn = args.NewStructure; tvSync.Nodes.Clear(); foreach (TreeNode node in tn) tvSync.Nodes.Add(node); foreach (TreeNode node in tvSync.Nodes) FixCheckedAndUnCheckedNodes(node); ReloadTreeView(args.OnlyShowDifferences); } </code></pre>
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    1. USganders
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    1. COwhy do you keep calling the `syncContext` inside `OnRebuildTreeView` if it is already running in the GUI thread?, also your `Thread.Sleep` call is going to freeze the GUI thread which is not a good idea at all.. I don't know if these are making your application hang but they don't look good. Also `.Post` does NOT block the caller, if you r logic need to block use `.Send` instead
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      1. POSynchronizationContext.Post not working inside BackgroundWorker
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    2. COGood point, didn't think about doing the syncContext call from the OnRebuildTreeView method...I'll take that out. As far as the Thread.Sleep(), I just added that just in case...(more debugging tries). I'll remove that stuff and try again. Thanks
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      1. POSynchronizationContext.Post not working inside BackgroundWorker
      1. USganders
    3. COIt might make things simpler if you attach `OnRebuildTreeView` to the `RunWorkerCompleted` event, from your code it seems like you only want to execute that once the main method of your thread finishes.
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