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POSorting ListBox with MVVM code binding
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copied!<p>I have a ListBox which happily displays data using a code-behind MVVM object. However, I want to sort the entries and so I thought an intermediate CollectionViewSource might work. But instead the program crashes on startup.</p> <p>Original xaml extract:</p> <pre><code><ListBox SelectedItem="{Binding SelectedCategory}" DisplayMemberPath="name" ItemsSource="{Binding Categories}" Name="CategoriesListBox" /> </code></pre> <p>Code behind extract:</p> <pre><code>public class ViewModel : INotifyPropertyChanged { private trainCategory[] _categories; private trainCategory _selectedCategory; public event PropertyChangedEventHandler PropertyChanged; public trainCategory[] Categories { get { return _categories; } set { if (_categories == value) { return; } _categories = value; RaisePropertyChanged("Categories"); } } //etc </code></pre> <p>Replacement XAML for ListBox:</p> <pre><code><ListBox SelectedItem="{Binding SelectedCategory}" DisplayMemberPath="name" ItemsSource="{Binding Source={StaticResource SortedItems}}" Name="CategoriesListBox" /> </code></pre> <p>And the CollectionViewSource:</p> <pre><code><CollectionViewSource x:Key="SortedItems" Source="{Binding Categories}"> <CollectionViewSource.SortDescriptions> <scm:SortDescription PropertyName="name"/> </CollectionViewSource.SortDescriptions> </CollectionViewSource> </code></pre> <p>It seems to me that the CollectionViewSource goes in between the view model and the ListBox, but it clearly doesn't (or I've done it wrong). Any pointers appreciated.</p>

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