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POView is not updated when on a separate thread
 

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    <p>I am trying to load some data in a separate thread, then add the loaded data to an ObservableCollection and update the view through ba binding.</p> <p>First, I was doing the following:</p> <pre><code>public OverviewViewModel() { Thread thread = new Thread(new ThreadStart(delegate { TheTVDB theTvdb = new TheTVDB(); foreach (TVSeries tvSeries in theTvdb.SearchSeries("Dexter")) { this.Overview.Add(tvSeries); } })); thread.SetApartmentState(ApartmentState.STA); thread.Start(); } </code></pre> <p>This gave the following error:</p> <blockquote> <p>This type of CollectionView does not support changes to its SourceCollection from a thread different from the Dispatcher thread.</p> </blockquote> <p>So I read on this forum that I should use the Dispatcher, so I put <code>this.Overview.Add(tvSeries)</code> into a call to the Dispatcher.</p> <pre><code>Dispatcher.CurrentDispatcher.BeginInvoke((Action)delegate { this.Overview.Add(tvSeries); }, DispatcherPriority.Normal); </code></pre> <p>Now, it doesn't crash anymore but the view is not updated. Nothing happens, the view is just empty. I have tested the functionality by running it on the main thread. Then the view is updated correctly.</p> <p>Does anyone know why the view is not updated and how I can fix this?</p> <p><strong>UPDATE</strong></p> <p>The below approach seems to work and it seems to do everything asynchronously. Can anyone confirm that this is the right approach for doing things asyncronously?</p> <pre><code>Dispatcher.CurrentDispatcher.BeginInvoke(new Action(delegate { TheTVDB theTvdb = new TheTVDB(); foreach (TVSeries tvSeries in theTvdb.SearchSeries("Dexter")) { this.Overview.Add(tvSeries); } }), DispatcherPriority.Background); </code></pre>
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    1. COYou probably have, but just a check - do you have `INotifyPropertyChanged` implemented?
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    2. COThat has nothing to do with the `ObservableCollection` raising the `CollectionChanged` event...
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      1. USkhellang
    3. COPlease consider adding a tag for either WPF or Silverlight (I guess). (And perhaps one for `Dispatcher`.)
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