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POWhy is Visual Studio skipping over my Exception from a ThreadPool work item?
 

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  1. POWhy is Visual Studio skipping over my Exception from a ThreadPool work item?
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    <p>I am aware of this other <a href="https://stackoverflow.com/questions/753841/how-to-catch-exceptions-from-a-threadpool-queueuserworkitem">post</a>, but it doesn't seem to apply to my situation.</p> <p>First off, here is my environment:<br> Windows XP 64-bit SP3; Visual Studio 2008 w/ SP; .NET 3.5 SP1; WPF application.</p> <p>My problem is that I cannot seem to step to where my exception happens. It just keeps running instead of continuing the debugging session.</p> <p>Here is some code -- I didn't write all of it, so please, no need for comments on naming :)</p> <pre><code>// start up the WPF application // set the handler for the Checked event ToggleButton channelButton1 = new ToggleButton(); channelButton1.Checked += (s, e) =&gt; ThreadPool.QueueUserWorkItem(SetTcpChannel, 1); </code></pre> <p>Then in that <code>SetTcpChannel</code> method:</p> <pre><code> try { int channel = (int)state; EnsureTcpSocket(); // more logic to do stuff with channel // that we don't care about for SO ... } catch (Exception e) { // just for illustration // this is where I expected the code to return ... } </code></pre> <p>And finally, in the place where the exception actually happens (inside <code>EnsureTcpSocket</code>):</p> <pre><code> if (_tcp == null) { // this is not a valid ip/port since the // target machine is not running (test condition) // but that's ok, I should get some exception // and continue debugging...right? _tcp = new TcpClient(ip, port); } </code></pre> <p>Here is what I have been doing:</p> <ol> <li>I set a breakpoint at the <code>EnsureTcpSocket</code> line inside <code>SetTcpChannel</code>,</li> <li>F11 (step-into) <code>EnsureTcpSocket</code> so I can see the <code>_tcp</code> piece of code</li> <li>Try to F10 (step-over) the <code>TcpClient</code> constructor</li> </ol> <p>At that last step, the application comes back up from the debugger and keeps running and I never see any exception.</p> <p>Any ideas?</p>
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