Passing DataContext of ListBox to it's context menu

Thu, 02 Jul 2009 00:13:48 Z

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>
             
                <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>
          
    </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

Passing DataContext of ListBox to it's context menu

Thu, 02 Jul 2009 00:20:28 Z

Try:

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

It should be work.

Passing DataContext of ListBox to it's context menu

Thu, 02 Jul 2009 00:31:56 Z

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

Thanks for reply
Michal

Passing DataContext of ListBox to it's context menu

Thu, 02 Jul 2009 23:15:24 Z

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

Passing DataContext of ListBox to it's context menu

Thu, 02 Jul 2009 23:30:41 Z

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++

Passing DataContext of ListBox to it's context menu

Thu, 02 Jul 2009 23:33:18 Z

One way would be enough

Regards,
Michal

Passing DataContext of ListBox to it's context menu

Fri, 03 Jul 2009 00:51:04 Z

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++