Selecting all Data Items in a Group

The following example demonstrates how to select all the data items contained in a group by adding them to a grid's selected-items collection when a group-header control is pressed. In the case where a group contains child groups, all the data items in the child groups will also be selected.

note

In v5.3 and up, this functionality can be activated by setting the IsGroupSelectionEnabled property to true.

XAML

  <Grid xmlns:xcdg="http://schemas.xceed.com/wpf/xaml/datagrid">
      <Grid.Resources>
        <xcdg:DataGridCollectionViewSource x:Key="cvs_orders"
                                      Source="{Binding Source={x:Static Application.Current},
                                                          Path=Orders}">
          <xcdg:DataGridCollectionViewSource.GroupDescriptions>
            <xcdg:DataGridGroupDescription PropertyName="ShipCountry"/>
            <xcdg:DataGridGroupDescription PropertyName="ShipCity"/>
          </xcdg:DataGridCollectionViewSource.GroupDescriptions>
        </xcdg:DataGridCollectionViewSource>
      <Style TargetType="{x:Type xcdg:GroupHeaderControl}">
        <EventSetter Event="PreviewMouseLeftButtonDown"
                    Handler="SelectRows"/>
      </Style>
    </Grid.Resources>
      <xcdg:DataGridControl x:Name="OrdersGrid"
                          ItemsSource="{Binding Source={StaticResource cvs_orders}}"/>
    </Grid>

C#

  private void SelectRows( object sender, MouseEventArgs e )
  {
    GroupHeaderControl groupHeaderControl = sender as GroupHeaderControl;
    if( groupHeaderControl == null )
      return;
    DataGridContext context = DataGridControl.GetDataGridContext( groupHeaderControl );
    GroupHeaderFooterItem header = ( GroupHeaderFooterItem )context.GetItemFromContainer( groupHeaderControl );
    if( !header.Equals( GroupHeaderFooterItem.Empty ) )
    {
      CollectionViewGroup group = context.GetParentGroupFromItem( header );
      if( group != null )
      {
        foreach( object item in group.Items )
        {
          if( item is CollectionViewGroup )
          {
            this.SelectRecurse( context, ( CollectionViewGroup )item );
          }
          else
          {
            context.SelectedItems.Add( item );
          }
        }
      }
    }
  }
  private void SelectRecurse( DataGridContext context, CollectionViewGroup group )
  {
    foreach( object item in group.Items )
    {
      if( item is CollectionViewGroup )
      {
        this.SelectRecurse( context, ( CollectionViewGroup )item );
      }
      else
      {
        context.SelectedItems.Add( item );
      }
    }
  }

VB.NET

  Private Sub SelectRows( ByVal sender As Object, ByVal e As MouseButtonEventArgs )
    Dim groupHeaderControl As GroupHeaderControl = TryCast( sender, GroupHeaderControl );
    If groupHeaderControl Is Nothing Then
      Return;
    End If
    Dim context As DataGridContext = DataGridControl.GetDataGridContext( groupHeaderControl )
    Dim header As GroupHeaderFooterItem = TryCast( context.GetItemFromContainer( grouHeaderControl, GroupHeaderFooterItem )
    If Not header.Equals( GroupHeaderFooterItem.Empty ) Then
      Dim group As CollectionViewGroup = context.GetParentGroupFromItem( header )
      If Not group Is Nothing Then
        For Each item As Object In group.Items
          If TypeOf item Is CollectionViewGroup Then
            Me.SelectRecurse( context, CType( item, CollectionViewGroup ) )
          Else
            context.SelectedItems.Add( item )
          End If
        Next item
      End If
    End If
  End Sub
  Private Sub SelectRecurse( ByVal context As DataGridContext, ByVal group As CollectionViewGroup )
    For Each item As Object In group.Items
      If TypeOf item Is CollectionViewGroup Then
        Me.SelectRecurse( context, CType( item, CollectionViewGroup ) )
      Else
        context.SelectedItems.Add( item )
      End If
    Next item
  End Sub