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POWPF Dispatcher.Invoke 'hanging'
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copied!<p>I have a somewhat complex WPF application which seems to be 'hanging' or getting stuck in a Wait call when trying to use the dispatcher to invoke a call on the UI thread.</p> <p>The general process is:</p> <ol> <li>Handle the click event on a button</li> <li>Create a new thread (STA) which: creates a new instance of the presenter and UI, then calls the method <strong>Disconnect</strong></li> <li>Disconnect then sets a property on the UI called <strong>Name</strong></li> <li>The setter for Name then uses the following code to set the property:</li> </ol> <pre><code> if(this.Dispatcher.Thread != Thread.CurrentThread) { this.Dispatcher.Invoke(DispatcherPriority.Normal, (ThreadStart)delegate{ this.Name = value; // Call same setter, but on the UI thread }); return; } SetValue(nameProperty, value); // I have also tried a member variable and setting the textbox.text property directly. </code></pre> <p>My problem is that when the dispatcher <strong>invoke</strong> method is called it seems to hang every single time, and the callstack indicates that its in a sleep, wait or join within the Invoke implementation.</p> <p>So, is there something I am doing wrong which I am missing, obvious or not, or is there a better way of calling across to the UI thread to set this property (and others)?</p> <p><strong>Edit:</strong> The solution was to call System.Windows.Threading.Dispatcher.Run() at the end of the thread delegate (e.g. where the work was being performed) - Thanks to all who helped.</p>

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