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POMust create DependencySource on same Thread as the DependencyObject
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  1. POMust create DependencySource on same Thread as the DependencyObject
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    copied!<p>I bind observable dictionary from view model to view. I use Caliburn Micro Framework.</p> <p><strong>View:</strong></p> <pre><code> &lt;ListBox Name="Friends" SelectedIndex="{Binding Path=SelectedFriendsIndex,Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" SelectedItem="{Binding Path=SelectedFriend, Mode=OneWayToSource, UpdateSourceTrigger=PropertyChanged}" Style="{DynamicResource friendsListStyle}" IsTextSearchEnabled="True" TextSearch.TextPath="Value.Nick" Grid.Row="2" Margin="4,4,4,4" PreviewMouseRightButtonUp="ListBox_PreviewMouseRightButtonUp" PreviewMouseRightButtonDown="ListBox_PreviewMouseRightButtonDown" MouseRightButtonDown="ListBox_MouseRightButtonDown" Micro:Message.Attach="[MouseDoubleClick]=[Action OpenChatScreen()]" &gt; </code></pre> <p><strong>Code from view model class.</strong></p> <p>Properties look like this:</p> <pre><code>public MyObservableDictionary&lt;string, UserInfo&gt; Friends { get { return _friends; } set { _friends = value; NotifyOfPropertyChange(() =&gt; Friends); } } </code></pre> <p>In Dispatcher timer I call every 3 seconds in seperate thread new service method.</p> <p>So I constructor of view model I have this:</p> <pre><code> _dispatcherTimer = new DispatcherTimer(); _dispatcherTimer.Tick += DispatcherTimer_Tick; _dispatcherTimer.Interval = TimeSpan.FromSeconds(3); _dispatcherTimer.Start(); _threadDispatcher = Dispatcher.CurrentDispatcher; </code></pre> <p>And Timer tick method is here:</p> <pre><code> private void DispatcherTimer_Tick(object sender, EventArgs eventArgs) { new System.Threading.Tasks.Task(() =&gt; { //get new data from server MyObservableDictionary&lt;string, UserInfo&gt; freshFriends = _service.GetFriends(Account); _threadDispatcher.BeginInvoke((System.Action)(() =&gt; { //clear data, Friend is property which is binded on listobox control Friends.Clear(); //here is problem - &gt; refresh data foreach (var freshFriend in freshFriends) { Friends.Add(freshFriend); } })); }).Start(); </code></pre> <p>when I run app I get this error:</p> <pre><code>Must create DependencySource on same Thread as the DependencyObject. at System.Windows.Markup.XamlReader.RewrapException(Exception e, Uri baseUri) at System.Windows.FrameworkTemplate.LoadTemplateXaml(XamlReader templateReader, XamlObjectWriter currentWriter) at System.Windows.FrameworkTemplate.LoadTemplateXaml(XamlObjectWriter objectWriter) at System.Windows.FrameworkTemplate.LoadOptimizedTemplateContent(DependencyObject container, IComponentConnector componentConnector, IStyleConnector styleConnector, List`1 affectedChildren, UncommonField`1 templatedNonFeChildrenField) at System.Windows.FrameworkTemplate.LoadContent(DependencyObject container, List`1 affectedChildren) at System.Windows.StyleHelper.ApplyTemplateContent(UncommonField`1 dataField, DependencyObject container, FrameworkElementFactory templateRoot, Int32 lastChildIndex, HybridDictionary childIndexFromChildID, FrameworkTemplate frameworkTemplate) at System.Windows.FrameworkTemplate.ApplyTemplateContent(UncommonField`1 templateDataField, FrameworkElement container) at System.Windows.FrameworkElement.ApplyTemplate() at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Border.MeasureOverride(Size constraint) </code></pre> <p>I try replace dispatcher:</p> <p>this <code>_threadDispatcher = Dispatcher.CurrentDispatcher;</code></p> <p>with this: <code>_threadDispatcher = Application.Current.Dispatcher;</code></p> <p>But it doesn’t help. Thank for advice.</p> <p>MyObservableDicionary is not dependency object or have dependecy property:</p> <pre><code>public class MyObservableDictionary&lt;TKey, TValue&gt; : IDictionary&lt;TKey, TValue&gt;, INotifyCollectionChanged, INotifyPropertyChanged {..} </code></pre>
 

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