CODEWITHSUNDEEP
c#wpfxamldata-binding
baka1408
baka1408

Reputation: 433

Binding to parent DataContext from ContextMenu

I am struggling with binding to parent DataContext from DataTemplate/ContextMenu control. I've already tried solutions mentioned here and here but with no luck. I'm not able to bind to neither to property or command - no exceptions are thrown, but commands are not invoked and properties are set to null.

Here's my code sample (simplified as its possible):

<Metro:MetroWindow ...>
<Window.DataContext>
    <local:MyViewModel />
</Window.DataContext>
<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="1*" />
        <ColumnDefinition Width="10*" />
        <ColumnDefinition Width="1*" />
    </Grid.ColumnDefinitions>
    <StackPanel ... />
    <Grid Grid.Column="1">
        <Border ... />
        <ListBox x:Name="FileList" ItemsSource="{Binding AddedFiles}" Margin="5,5,5,5" SelectionMode="Multiple" SelectionChanged="ItemsSelectionChanged">
            <ItemsControl.ItemsPanel>
                <ItemsPanelTemplate>
                    <WrapPanel MaxWidth="700" IsItemsHost="True"/>
                </ItemsPanelTemplate>
            </ItemsControl.ItemsPanel>
            <ItemsControl.ItemTemplate>
                <DataTemplate DataType="{x:Type local:FileListItem}">
                    <Grid Margin="5" Width="110" ToolTip="{Binding Path=TooltipInfo}" MouseDown="FileItemClick" Tag="{Binding DataContext,RelativeSource={RelativeSource Mode=Self}}">
                        <Grid.ContextMenu>
                            <ContextMenu>
                                <MenuItem Header="{Binding PlacementTarget.Tag.test,RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=ContextMenu}}" />
                                <MenuItem Header="Test command" Command="{Binding PlacementTarget.Tag.CloseCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=ContextMenu}}"/>
                            </ContextMenu>
                        </Grid.ContextMenu>
                        <Grid.RowDefinitions ... />
                        <StackPanel ...(Databinding works here!) />
                        <TextBlock ... (Databinding works here!) />
                        <Rectangle ... (Databinding works here!) />
                    </Grid>
                </DataTemplate>
            </ItemsControl.ItemTemplate>
        </ListBox>
    </Grid>
</Grid>

I've tried to bind Tag property with Window's DataContext via RelativeSource too (and other possible solutions found across other topics), but nothing happens. Something must be clearly wrong in my approach.

Upvotes: 3

Views: 2743

Answers (2)

WPFUser
WPFUser

Reputation: 1175

You cannot find PlacementTarget property in Grid. Change your binding like this,

 <MenuItem Header="{Binding PlacementTarget.Tag.test,RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=ContextMenu}}" />

or like,

<MenuItem Header="{Binding Parent.PlacementTarget.Tag.test,RelativeSource={RelativeSource Self}}" />

Also To access ViewModel's command, Access DataContext of ListBox not ListBoxItem,

 <Grid Margin="5" Width="110" ToolTip="{Binding Path=TooltipInfo}" MouseDown="FileItemClick" Tag="{Binding DataContext,RelativeSource={RelativeSource Mode= FindAncestor, AncestorType=ListBox}}">

Upvotes: 6

Oleksii Klipilin
Oleksii Klipilin

Reputation: 1936

Have you tried this? (note DataContext added)

<MenuItem Header="{Binding DataContext.PlacementTarget.Tag.test,RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Grid}}" />

Upvotes: 0

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