Passing DataContext of ListBox to it's context menu

Question

I have a question related to data binging.

How can I pass DataContext of ListView to the ListView's ContextMenu object  ?


<ListView IsSynchronizedWithCurrentItem="True" Name="masterListView"
  ItemsSource="{Binding ImageCollectionView}" Grid.Row="1">
   
    <ListView.Resources>
        <ContextMenu x:Key="headerContextMenu">
           
           
            <ContextMenu.DataContext>
             <!-- I tried this binding but with no luck-->
                <Binding RelativeSource="{RelativeSource Mode=FindAncestor, AncestorType={x:Type ListView}}"/>
            </ContextMenu.DataContext>
           
            <MenuItem Command="{Binding DoSomething}">
                <MenuItem.Header>
                    <cp:GVColumnSelectorControl></cp:GVColumnSelectorControl>
                </MenuItem.Header>
            </MenuItem>
           
        </ContextMenu>
    </ListView.Resources>
    

    <ListView.GroupStyle>
          <!-- commented out for clarity -->
    </ListView.GroupStyle>
   

   
    <ListView.View>
        <GridView>
           
            <GridView.ColumnHeaderContainerStyle>
                <Style TargetType="{x:Type GridViewColumnHeader}">
                    <Setter Property="ContextMenu" Value="{StaticResource headerContextMenu}" />
                </Style>
            </GridView.ColumnHeaderContainerStyle>
           
            <GridViewColumn Width="100" Header="Property 1" DisplayMemberBinding="{Binding SomeProperty1}"></GridViewColumn>
            <GridViewColumn Width="100" Header="Property 2" DisplayMemberBinding="{Binding SomeProperty2}"></GridViewColumn>
            <GridViewColumn Width="100" Header="Property 3" DisplayMemberBinding="{Binding SomeProperty3}"></GridViewColumn>
        </GridView>
    </ListView.View>
   
</ListView>



Context menu has to display a UserControl that needs to have access to the same object as the one bound to the ListView




Thanks in advance for help,
Regards,
Michal

Answer 1

Try:

<Binding
RelativeSource="{RelativeSource Mode=FindAncestor, AncestorType={x:Type ListView}}"
Path="DataContext" />


It should be work.

Answer 2

Still does not work.
I can see that the DataContext property is still null

Thanks for reply
Michal

Answer 3

I've found that when I remove wrongly specified binding, Context menu automatically inherits DataContext properly. I added the second menuitem for testing purposes and it correctly prints dataContext type:

<MenuItem>
  <!-- to be removed-->
  <MenuItem.Header>
     <TextBlock Grid.Row="2" Text="{Binding}"></TextBlock>
  </MenuItem.Header>
</MenuItem>

The problem is now how to pass this DataContext from menuitem (which has it for sure) into
<cp:GVColumnSelectorControl></cp:GVColumnSelectorControl>

I can see in the codebehin that DataContext property is null.

I tried to define two DependencyProperties: one of type int, and the second of BusinessType.
When the control is declared as follows:

<MenuItem Command="{Binding DoSomething}">
                <MenuItem.Header>
                   <cp:GVColumnSelectorControl IntProperty="7" BusinessTypeProperty="{Binding}"></cp:GVColumnSelectorControl>
                </MenuItem.Header>
            </MenuItem>

I can see in codebehind that IntProperty is 7, but BusinesstypeProperty value is null :-(  [note that MenuItem's DataContext is set with the data for sure]


Thanks,
Michal

Answer 4

I can see in codebehind that IntProperty is 7, but BusinesstypeProperty value is null

Do you need to set the binding mode to OneWayToSource or TwoWay?


Mark

---

Mark Salsbery Microsoft MVP - Visual C++

Answer 5

One way would be enough


Regards,
Michal

Answer 6

One way would be enough


Regards,
Michal

Wow I was thinking totally backward on that one, sorry....disregard.


Anyway, maybe try

<cp:GVColumnSelectorControl IntProperty="7" BusinessTypeProperty="{Binding Path=DataContext, RelativeSource={RelativeSource self}}"></cp:GVColumnSelectorControl>
 

---

Mark Salsbery Microsoft MVP - Visual C++