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POMust create DependencySource on same Thread as DependencyObject
 

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    <p>I have an application written in wpf, which downloads some webpages, parses html code and saves some values.</p> <pre><code>class ListOfItems { public List&lt;SomeObject&gt; ListToBind; public void DownloadItems() { Task.Factory.StartNew(() =&gt; { ... ... if (OnDownloadCompleted != null) OnDownloadCompleted(this, EventArgs.Empty); } } } class SomeObject { public string NameOfItem; public MyClass Properties; } class MyClass { public int Percentage; public SolidColorBrush Color; } </code></pre> <p>This is the object model I'm using. It's simplified version and I don't want you to reorganize it, there is a reason I wrote it this way. In <code>ListOfItems</code> class is method which does all the job (there are some other methods used inside to make code readable) - downloads source, parses and fills <code>ListToBind</code> with data, f.e.</p> <pre><code>[0] =&gt; NameOfItem = "FirstOne", Properties = {99, #FF00FF00} [1] =&gt; NameOfItem = "SecondOne", Properties = {50, #FFFF0000} etc. </code></pre> <p>As you can see, when this method <code>DownloadItems</code> completes its job, <code>OnDownloadCompleted</code> event is raised. In the main thread is following code</p> <pre><code>void listOfItems_OnDownloadCompleted(object sender, EventArgs args) { dataGrid.Dispatcher.Invoke(new Action(() =&gt; { dataGrid.ItemsSource = ListOfItemsInstance.ListToBind; })); } </code></pre> <p>DataGrid on the <code>MainWindow.xaml</code> is filled with values, because of following xaml code snippet.</p> <pre><code>&lt;DataGrid Name="dataGrid" AutoGenerateColumns="False"&gt; &lt;DataGrid.Columns&gt; &lt;DataGridTextColumn Header="Tag" Binding="{Binding Name}"/&gt; &lt;DataGridTextColumn Header="Color" Binding="{Binding MyClass.Percentage}"&gt; &lt;!--&lt;DataGridTextColumn.CellStyle&gt; &lt;Style TargetType="DataGridCell"&gt; &lt;Setter Property="Background" Value="{Binding MyClass.Color}" /&gt; &lt;/Style&gt; &lt;/DataGridTextColumn.CellStyle&gt;--&gt; &lt;/DataGridTextColumn&gt; &lt;/DataGrid.Columns&gt; &lt;/DataGrid&gt; </code></pre> <p>It works just fine. But there is this problem. Try to uncomment commented xaml snippet and you will get <code>Must create DependencySource on same Thread as the DependencyObject.</code> error.</p> <p>Finally, my question is, how to avoid this error?</p> <p><strong>EDIT:</strong></p> <p>It should look like this in the end. This picture is taken from MS Excel and coloured in Adobe Photoshop.</p> <p><img src="https://i.stack.imgur.com/7uDyr.jpg" alt="example"></p>
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