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.

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

XAML	Copy Code
<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>

XAML

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  <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>

VB.NET	Copy Code
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

VB.NET

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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

C#	Copy Code
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 ); } } }

Copy Code

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 );

  }

}

}