WPF DataGrid单元格通过父控件中的数据进行绑定

Question

I am trying to sort this out and cannot see light in the dark.

I have worksheets (tables) in workspace. All dynamic (columns, mount of tables, ...). Based on object for worksheet I would like to set datagrid rotation.

VM structure:

ControlVM : 
{ Workspace: [ 
  {  
  Worksheet: [
    {     
      DataViewBindingData: [DataView type],    
      isRotated: rue | false    
    },
    {...} 
  ]
}


<ScrollViewer Grid.Column="0" Grid.Row="0" >
                <ItemsControl ItemsSource="{Binding Path=Workspace}" >
                    <ItemsControl.ItemTemplate>
                        <DataTemplate>
                        <StackPanel>
                            <Expander Header="{Binding Path=WorksheetName}" ExpandDirection="Down" IsExpanded="True" >
                                    <StackPanel>
                                        <DataGrid CanUserResizeColumns="False" HeadersVisibility="Column" CanUserSortColumns="False" HorizontalAlignment="Stretch" CanUserAddRows="False" Margin="5" 
                                                  SelectionUnit="Cell" SelectionMode="Single" ItemsSource="{Binding Path=DataViewBindingData}" Loaded="DataGrid_Loaded" 
                                                  BeginningEdit="DataGrid_BeginningEdit" />
                                    </StackPanel>
                                </Expander>
                            </StackPanel>
                        </DataTemplate>
                    </ItemsControl.ItemTemplate>
                </ItemsControl>
            </ScrollViewer>

And inside custom styles resources in my base style for control (header, cells), I am trying to access isRotated property of worksheet object

<Style x:Key="DataGridBase" TargetType="Control">
     <Style.Triggers>
         <!--  TODO cannot find an ancestor for data binding -->
        <DataTrigger Binding="{Binding IsRotated, Converter={StaticResource DebugConverter}, Mode=OneWay}"  Value="True">
            <Setter Property="LayoutTransform">
                <Setter.Value>
                    <TransformGroup>
                        <RotateTransform Angle="-90" />
                        <ScaleTransform ScaleX="-1" ScaleY="1" />
                    </TransformGroup>
                </Setter.Value>
            </Setter>
            <Setter Property="TextOptions.TextFormattingMode" Value="Display" />
        </DataTrigger>
    </Style.Triggers>
</Style >

<!--DataGrid Cells-->
<Style TargetType="{x:Type DataGridCell}" BasedOn="{StaticResource DataGridBase}" />

And thats the problem, I dont know how to access parent control's data to bind the property. Thanks for suggestions.

Answer 1

The implicit DataContext inside DataGridCell is actually the current DataGridRow's bound item. So in this case you have to use RelativeSource to find the DataGrid and set Path to DataContext.IsRotated (the DataGrid 's DataContext is a Worksheet ):

<DataTrigger Binding="{Binding DataContext.IsRotated, 
                       RelativeSource={RelativeSource AncestorType=DataGrid}
                       Converter={StaticResource DebugConverter}, Mode=OneWay}"
              Value="True">
<!-- ... -->