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Asked: 2026-05-29T12:35:20+00:00

I’ve got the following code that works well : <Viewbox.Resources> <CollectionViewSource x:Key=viewSource Source={Binding Path=SelectionList}>

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I’ve got the following code that works well :

<Viewbox.Resources>
    <CollectionViewSource x:Key="viewSource"
                          Source="{Binding Path=SelectionList}">
        <CollectionViewSource.SortDescriptions>
            <scm:SortDescription PropertyName="Description" />
        </CollectionViewSource.SortDescriptions>
    </CollectionViewSource>

</Viewbox.Resources>
<ComboBox ItemsSource="{Binding Source={StaticResource ResourceKey=viewSource}}"/>

I would like to put my CollectionViewSource directly in my ComboBox without using any resource like that :

<ComboBox SelectedItem="{Binding Path=Value, Mode=TwoWay}">
    <ComboBox.ItemsSource>
        <Binding>
            <Binding.Source>
                <CollectionViewSource Source="{Binding Path=SelectionList}">
                    <CollectionViewSource.SortDescriptions>
                        <scm:SortDescription PropertyName="Description" />
                    </CollectionViewSource.SortDescriptions>
                </CollectionViewSource>
            </Binding.Source>
        </Binding>
    </ComboBox.ItemsSource>
</ComboBox>

But this way my ComboBox is always empty, and I get the following binding error :

System.Windows.Data Error: 2 : Cannot find governing FrameworkElement
or FrameworkContentElement for target element.
BindingExpression:Path=SelectionList; DataItem=null; target element is
‘CollectionViewSource’ (HashCode=1374711); target property is ‘Source’
(type ‘Object’)

Does anyone know how could I do it ?

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1 Answer

  1. Editorial Team

    Nicolas, although this is not an answer to your question because it still uses resources, you could put the CollectionViewSource inside the ComboBox by defining it in its local resource dictionary:

    <ComboBox>
    <ComboBox.Resources>
        <CollectionViewSource x:Key="viewSource" Source="{Binding Path=SelectionList}">
            <CollectionViewSource.SortDescriptions>
                <scm:SortDescription PropertyName="Description" />
            </CollectionViewSource.SortDescriptions>
        </CollectionViewSource>
    </ComboBox.Resources>
    <ComboBox.ItemsSource>
        <Binding Source="{StaticResource viewSource}"/>
    </ComboBox.ItemsSource>
</ComboBox>
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