sorting a bound ItemsControl in a DataTemplate (XAML only)

collectionviewsource, datatemplate, itemscontrol, sorting, wpf

Solution

Try moving the `CollectionViewSource` resource to the scope of the `Viewbox` rather than directly the `DataTemplate`:

<DataTemplate DataType="{x:Type vm:Company}">
    <Viewbox>
        <Viewbox.Resources>
            <CollectionViewSource x:Key="viewSource" Source="{Binding Employees}">
                <CollectionViewSource.SortDescriptions>
                        <scm:SortDescription PropertyName="ID" />
                    </CollectionViewSource.SortDescriptions>
            </CollectionViewSource>
        </Viewbox.Resources>
        <ItemsControl ItemsSource="{Binding Source={StaticResource viewSource}}">
             <ItemsControl.ItemsPanel>
                <ItemsPanelTemplate>
                    <StackPanel Orientation="Horizontal"/>
                </ItemsPanelTemplate>
            </ItemsControl.ItemsPanel>
        </ItemsControl>
    </Viewbox>
</DataTemplate>

Problem

Is there a XAML only way to automatically sort the bound items (list of ViewModel object) ItemsControl based on one of the properties of the items. The ItemsControl is part of a DataTemplate. I thought CollectionViewSource would do the trick, but how do I bind the CollectionViewSource to the ItemsControl. The follwoing code dispays nothing: ``` <--xmlns:scm="clr-namespace:System.ComponentModel;assembly=WindowsBase"--> <DataTemplate DataType="{x:Type vm:Company}"> <DataTemplate.Resources> <CollectionViewSource x:Key="viewSource" Source="{Binding Employees}"> <CollectionViewSource.SortDescriptions> <scm:SortDescription PropertyName="ID" /> </CollectionViewSource.SortDescriptions> </CollectionViewSource> </DataTemplate.Resources> <Viewbox> <ItemsControl ItemsSource="{Binding Source={StaticResource viewSource}}"> <ItemsControl.ItemsPanel> <ItemsPanelTemplate> <StackPanel Orientation="Horizontal"/> </ItemsPanelTemplate> </ItemsControl.ItemsPanel> </ItemsControl> </Viewbox> </DataTemplate> ```

Original source