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POC# Invoke Failing on Thread Function
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copied!<p>I'm using a timer to regularly read-in a log file and post certain contents to a textbox in a Windows Form Application I'm developing in C#. I do this by sending a string to set_textbox_thread which posts the text (s) to the appropriate textbox (tbc) in the else below. The code below works in the practice application I built. However, the same code runs, but fails to update my textbox in the full application I'm building. It seems to be failing on the Invoke statement, which fails to call set_textbox_thread again. My theory is that, because my full application has a more complex set of controls, I am not calling Invoke via the correct control. I've tried calling it via "this" the parent panel, the parent form, and the button that triggers set_textbox_thread, and am dealing with the same outcome. Two questions:</p> <ol> <li>Which control should I call Invoke under?</li> <li>Is there a way to retrieve "the thread that owns the controls underlying windows handle? Can I do this through the Controls.Owner method?</li> <li>I have tried making this Invoke call using try/catch, but am unable to retrieve an error message in the catch. Any ideas how to resolve the issue this way?</li> </ol> <p>Thanks in advance!</p> <pre><code>private delegate void stringDelegate(string s); private void set_textbox_thread(string s) { TextBox tbc = get_thread_tb(); if (tbc.InvokeRequired) { MessageBox.Show("Invoke Required"); stringDelegate sd = new stringDelegate(set_textbox_thread); **this.Invoke(sd, new object[] {s });** MessageBox.Show("Invoke Completed"); } else { </code></pre>

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