WPF CompositeCollection grouping by each collection view

Question

I've set up a CompositeCollection containing two or more collections as follows (simplified):

<Grid.Resources>
    <CollectionViewSource x:Key="CollectionA" Source="{Binding CollectionA}" />
    <CollectionViewSource x:Key="CollectionB" Source="{Binding CollectionB}" />
    <CompositeCollection x:Key="FullCollection">
        <CollectionContainer Collection="{Binding Source={StaticResource CollectionA}}" />
        <CollectionContainer Collection="{Binding Source={StaticResource CollectionB}}" />
    </CompositeCollection>
</Grid.Resources>

...

<ListView ItemsSource="{StaticResource FullCollection}">
    <ListView.View>
        <GridView>

And then some columns displayed inside the GridView. However, I can't seem to be able to add GroupDescriptions to the CompositeCollection, only the individual CollectionViewSource elements.

What I want to do is group by the collections themselves, such that the ListView has a header, then the first collection's contents, another header, then the second collection's contents, etc.

Am I barking up the wrong tree trying to group these in this way?

Duty

Nobody? Dan did you find any workaround? – Pester

Answer 1

I had the same problem but for a drop down combobox. The solution was to simply had some disabled items inbetween the collections, e.g. adapting to your problem it would be something like:

<Grid.Resources>
    <CollectionViewSource x:Key="CollectionA" Source="{Binding CollectionA}" />
    <CollectionViewSource x:Key="CollectionB" Source="{Binding CollectionB}" />
    <CompositeCollection x:Key="FullCollection">
        <ListViewItem IsEnabled="False">Collection A:</ListViewItem>
        <CollectionContainer Collection="{Binding Source={StaticResource CollectionA}}" />
        <ListViewItem IsEnabled="False">Collection B:</ListViewItem>
        <CollectionContainer Collection="{Binding Source={StaticResource CollectionB}}" />
    </CompositeCollection>
</Grid.Resources>

Finkelstein

You can't grouping dynamic collections. – Modulator

@JokeHuang it worked for me, what do you mean? – Finkelstein

Your group name is static, can not change at the run time, and can not group by different properties at the run time. – Modulator