Question

I have to bind to local variable from code behind in ListView.ItemTemplate. I have tried using datacontext:

            <ListView Name="listView" ItemsSource="{Binding}" DataContext="{Binding}" VerticalAlignment="Stretch" MaxHeight="300" Background="White" Foreground="Black" HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch" BorderBrush="#FFCDCDCD" BorderThickness="1" ScrollViewer.VerticalScrollBarVisibility="Auto" IncrementalLoadingTrigger="None" SelectionChanged="listView_SelectionChanged" >
                <ListView.ItemTemplate>
                    <DataTemplate>
                        <StackPanel Orientation="Horizontal" MaxHeight="25" >
                            <TextBlock Grid.Row="0" Grid.Column="0" Text="{Binding Text}" Width="{Binding Width}" />
                            <Image Grid.Row="0" Grid.Column="1" Source="{Binding Image}" Stretch="None" Width="40" HorizontalAlignment="Left" Margin="4,0,0,0" />
                        </StackPanel>
                    </DataTemplate>
                </ListView.ItemTemplate>
            </ListView>

In place of “Width=”{Binding Width}”” I want to have property from datacontext – rest of data is connected with itemsSource. How to “tell” xaml to use property from datacontext? (right now it returns error “property not found”). I don’t want to change my itemsource and add there width because it is constant for every element (it’s obvious 😉 ).

Thank you in advance 🙂

Answer 1

It does use the DataContext, which for the ItemTemplate is the item. You can walk up the tree to find another DataContext, in this case you want the ListView's:

{Binding DataContext.Width,
         RelativeSource={RelativeSource AncestorType=ListView}}