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POHow can I get the CollectionView that is defined in XAML
 

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  1. POHow can I get the CollectionView that is defined in XAML
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    <p>I wanted to bind to an <code>ObservableCollection</code> in XAML and also apply the grouping there. In principle, this worked fine.</p> <pre><code>&lt;UserControl.Resources&gt; &lt;CollectionViewSource x:Key="cvs" Source="{Binding Path=TestTemplates}"&gt; &lt;CollectionViewSource.SortDescriptions&gt; &lt;scm:SortDescription PropertyName="Title"/&gt; &lt;/CollectionViewSource.SortDescriptions&gt; &lt;CollectionViewSource.GroupDescriptions&gt; &lt;PropertyGroupDescription PropertyName="TestCategory"/&gt; &lt;/CollectionViewSource.GroupDescriptions&gt; &lt;/CollectionViewSource&gt; &lt;/UserControl.Resources&gt; </code></pre> <p>Then the data binding expression became <code>ItemsSource="{Binding Source={StaticResource ResourceKey=cvs}}"</code> instead of <code>ItemsSource="{Binding Path=TestTemplates}"</code>.</p> <p>At first, everything seemed cool, until I wanted to refresh the UI from the view model. The problem is, that <code>CollectionViewSource.GetDefaultView(TestTemplates)</code> returned a different view than the one from XAML where the grouping was applied. Thus, I could not set selection or do anything useful with it.</p> <p>I could fix it by binding the list again directly to the view model's property and setting up the grouping in the code-behind. But I'm not that happy with this solution.</p> <pre><code>private void UserControlLoaded(object sender, RoutedEventArgs e) { IEnumerable source = TemplateList.ItemsSource; var cvs = (CollectionView)CollectionViewSource.GetDefaultView(source); if (cvs != null) { cvs.SortDescriptions.Add(new SortDescription("Title", ListSortDirection.Ascending)); cvs.GroupDescriptions.Add(new PropertyGroupDescription("TestCategory")); } } </code></pre> <p>I assume, the reason for that is already <a href="https://stackoverflow.com/questions/5489004/" title="Why does CollectionViewSource.GetDefaultView() return the wrong CurrentItem from inside a Task thread?">given by John Skeet here</a>.</p> <p>Nevertheless, I would expect that there should be a way to get the right view. Am I wrong?</p>
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    1. COYou are going about it the wrong way. A VM should have no knowledge of the view. If you want to update the view, ensure the property it binds to is either an ObservableCollection or your code raises NotifyPropertyChanged explicitly when modifying the collection.
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    2. CO@PanagiotisKanavos: The stuff in the list view actually *is* in an `ObservableCollection` and the items in the UI do update on a property change. But the grouping does not respect that. A known workaround is to force the update, i.e. `CollectionViewSource.GetDefaultView(…).Refresh`.
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    3. COIn .NET 4.5, this will be remedied with the [ICollectionViewLiveShaping](http://msdn.microsoft.com/en-us/library/system.componentmodel.icollectionviewliveshaping(v=vs.110).aspx).
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