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POC#: Method Invoke never returns
 

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  1. POC#: Method Invoke never returns
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    <p>I've got a threaded invoke call that never returns.</p> <p>The thread runs just fine right up until I call the line that ways, "<code>owner.Invoke(methInvoker);</code>"</p> <p>When debugging, I can slowly step, step, step, but once I hit <code>owner.Invoke</code>... it's Over!</p> <pre><code>Control owner; public event ReportCeProgressDelegate ProgressChanged; public void ReportProgress(int step, object data) { if ((owner != null) &amp;&amp; (ProgressChanged != null)) { if (!CancellationPending) { ThreadEventArg e = new ThreadEventArg(step, data); if (owner.InvokeRequired) { MethodInvoker methInvoker = delegate { ProgressChanged(this, e); }; owner.Invoke(methInvoker); } else { ProgressChanged(this, e); } } else { mreReporter.Set(); mreReporter.Close(); } } } </code></pre> <p>FYI: This is a custom class that mimics the <code>BackgroundWorker</code> class, which is not available on controls that do not have Forms.</p> <p>Thinking Invoke might not be required, I manually stepped the cursor in the debugger over that part of the code and tried calling <code>ProgressChanged</code> directly, but VS2010's debugger threw a cross thread exception.</p> <p><strong>EDIT:</strong></p> <p>Due to the first 3 comments I have received, I wanted to update with my <code>ProgressChanged</code> method:</p> <pre><code>worker.ProgressChanged += delegate(object sender, ThreadEventArg e) { if (progressBar1.Style != ProgressBarStyle.Continuous) { progressBar1.Value = 0; object data = e.Data; if (data != null) { progressBar1.Maximum = 100; } progressBar1.Style = ProgressBarStyle.Continuous; } progressBar1.Value = e.ProgressPercentage; }; </code></pre> <p>There is a breakpoint on the first line of the <em>anonymous method</em>, but it never gets hit either.</p> <p><strong>EDIT 2</strong></p> <p>Here is a more complete listing of the call to the thread:</p> <pre><code>List&lt;TableData&gt; tList = CollectTablesFromForm(); if (0 &lt; tList.Count) { using (SqlCeReporter worker = new SqlCeReporter(this)) { for (int i = 0; i &lt; tList.Count; i++) { ManualResetEvent mre = new ManualResetEvent(false); worker.StartThread += SqlCeClass.SaveSqlCeDataTable; worker.ProgressChanged += delegate(object sender, ThreadEventArg e) { if (progressBar1.Style != ProgressBarStyle.Continuous) { progressBar1.Value = 0; object data = e.Data; if (data != null) { progressBar1.Maximum = 100; } progressBar1.Style = ProgressBarStyle.Continuous; } progressBar1.Value = e.ProgressPercentage; }; worker.ThreadCompleted += delegate(object sender, ThreadResultArg e) { Cursor = Cursors.Default; progressBar1.Visible = false; progressBar1.Style = ProgressBarStyle.Blocks; if (e.Error == null) { if (e.Cancelled) { MessageBox.Show(this, "Save Action was Cancelled.", "Save Table " + tList[i].TableName); } } else { MessageBox.Show(this, e.Error.Message, "Error Saving Table " + tList[i].TableName, MessageBoxButtons.OK, MessageBoxIcon.Error); } mre.Set(); }; worker.RunWorkerAsync(tList[i]); progressBar1.Value = 0; progressBar1.Style = ProgressBarStyle.Marquee; progressBar1.Visible = true; Cursor = Cursors.WaitCursor; mre.WaitOne(); } } } </code></pre> <p>I hope this isn't overkill! I hate presenting too much information, because then I get people critiquing my style. :)</p>
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    1. COInvoked methos is totally different process, add break point at the start of your method so u will be able to enter it.
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      1. USSenad Meškin
    2. COThe event loop could be tied up elsewhere. I would check for anything blocking in another handler.
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      1. USBrook
    3. COHave you paused the debugger while it is hanging around, gone to the "Threads" debugging Window, double-clicked each thread, looked at its call stack and place of execution and looked for 1) deadlocks (e.g. code is paused on "Wait" or "WaitAll" in more than one place) 2) general strange operations. Take note of the thread ID of the GUI thread prior to the application freeze and see especially what it is doing after the freeze.
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      1. POC#: Method Invoke never returns
      1. USDavid Gladfelter
 

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