从DataGrid中的DataTemplate访问窗口的DataContext

Question

I use a DataGrid in my WPF application. It does feature RowDetails for selected Rows. Therefor I set the RowDetailsTemplate. Inside this DataTemplate i want to access my Window's DataContext. For Example I have a lable inside my RowDetailsTemplate and I want to bind it's content-property to a property of my viewModel which is in the DataContext of the window. How do I achieve this.

Thank you for your help!

Answer 1

Look at this usage of RelativeSource based binding, like {Binding RelativeSource={RelativeSource AncestorType={x:Type Window}} . Here is example:

1. Xaml:

     <DataGrid ItemsSource="{Binding Strings}" AutoGenerateColumns="False" > <DataGrid.Columns> <DataGridTemplateColumn Header="String" Width="SizeToCells" IsReadOnly="True"> <DataGridTemplateColumn.CellTemplate> <DataTemplate DataType="{x:Type soDataGridHeplAttempt:ClicableItemsModel}"> <ListBox HorizontalAlignment="Stretch" VerticalAlignment="Stretch" ItemsSource="{Binding ClickableItems}"> <ListBox.ItemsPanel> <ItemsPanelTemplate> <StackPanel Orientation="Horizontal"></StackPanel> </ItemsPanelTemplate> </ListBox.ItemsPanel> <ListBox.ItemContainerStyle> <Style TargetType="ListBoxItem"> <Setter Property="ContentTemplate"> <Setter.Value> <DataTemplate> <Button Width="70" Content="{Binding }" Style="{StaticResource ButtonInCellStyle}" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Command="{Binding RelativeSource={RelativeSource AncestorType={x:Type Window}}, Path=DataContext.Command}" CommandParameter="{Binding RelativeSource={RelativeSource Self}, Path=Content}"/> </DataTemplate> </Setter.Value> </Setter> </Style> </ListBox.ItemContainerStyle> </ListBox> </DataTemplate> </DataGridTemplateColumn.CellTemplate> </DataGridTemplateColumn> </DataGrid.Columns> </DataGrid> 

2. View model:

    private ICommand _command; public ObservableCollection<ClicableItemsModel> Strings { get; set; } public ICommand Command { get { return _command ?? (_command = new RelayCommand<object>(MethodOnCommmand)); } } private void MethodOnCommmand(object obj) { } 

3. Model pu this inside the the model class:

     public ObservableCollection<String> ClickableItems { get; set; } 

regards,