GroupConfigurationSelector Class

Represents a group-configuration selector that selects the appropriate group configuration for a group.

Syntax

Visual Basic
C#

'Declaration
 
Public MustInherit Class GroupConfigurationSelector

'Usage
 
Dim instance As GroupConfigurationSelector

public abstract class GroupConfigurationSelector

Example

All examples in this topic assume that the grid is bound to the Orders table of the Northwind database, unless stated otherwise.

The following example demonstrates how to create a custom group-configuration selector that will return the appropriate group configuration depending on the number of items in a group. The implementation of the ItemCountGroupConfigurationSelector is provided below.

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="ShipCity" />
      </xcdg:DataGridCollectionViewSource.GroupDescriptions>
    </xcdg:DataGridCollectionViewSource>
  </Grid.Resources>
  <xcdg:DataGridControl x:Name="OrdersGrid"
                        ItemsSource="{Binding Source={StaticResource cvs_orders}}">

    <xcdg:DataGridControl.GroupConfigurationSelector>
      <local:ItemCountGroupConfigurationSelector MinItemCount="10" />
    </xcdg:DataGridControl.GroupConfigurationSelector>
  </xcdg:DataGridControl>
</Grid>

The following code provides the implementation of the ItemCountGroupConfigurationSelector.

Visual Basic

Public Class ItemCountGroupConfigurationSelector
               Inherits GroupConfigurationSelector
    Public Sub New
    End Sub
    Public Overrides Function SelectGroupConfiguration( ByVal groupLevel As Integer, _
                    ByVal collectionViewGroup As System.Windows.Data.CollectionViewGroup, _
                    ByVal groupDescription As System.ComponentModel.GroupDescription ) As GroupConfiguration

      If collectionViewGroup Is Nothing Then
        Return MyBase.SelectGroupConfiguration( groupLevel, collectionViewGroup, groupDescription )
      End If
      Dim groupConfiguration As New GroupConfiguration()
      Dim style As New Style( GetType( Xceed.Wpf.DataGrid.DataRow ) )

      If collectionViewGroup.ItemCount <= m_minItemCount Then ' red
        style.Setters.Add( New Setter( DataRow.BackgroundProperty, Brushes.Red ) )
      Else ' green
        style.Setters.Add( New Setter( DataRow.BackgroundProperty, Brushes.LightGreen ) )
      End If
      groupConfiguration.ItemContainerStyle = style
      Return groupConfiguration
    End Function
    Private m_minItemCount As Integer = 0
    Public Property MinItemCount As Integer
      Get
        Return m_minItemCount
      End Get
      Set
        m_minItemCount = value
    End Property
  End Class

The following code provides the implementation of the ItemCountGroupConfigurationSelector.

public class ItemCountGroupConfigurationSelector : GroupConfigurationSelector
  {
    public ItemCountGroupConfigurationSelector()
    {
    } 
   public override GroupConfiguration SelectGroupConfiguration( int groupLevel,
                   System.Windows.Data.CollectionViewGroup collectionViewGroup,
                   System.ComponentModel.GroupDescription groupDescription )
   {
     if( collectionViewGroup == null )
       return base.SelectGroupConfiguration( groupLevel, collectionViewGroup, groupDescription );
     GroupConfiguration groupConfiguration = new GroupConfiguration();
     Style style = new Style( typeof( Xceed.Wpf.DataGrid.DataRow ) );

     if( collectionViewGroup.ItemCount <= m_minItemCount ) // red
     {
       style.Setters.Add( new Setter( DataRow.BackgroundProperty, Brushes.Red ) );       
     }
     else // green
     {
       style.Setters.Add( new Setter( DataRow.BackgroundProperty, Brushes.LightGreen ) );       
     }
     groupConfiguration.ItemContainerStyle = style;
     return groupConfiguration;
   }
    private int m_minItemCount = 0;
    public int MinItemCount
    {
      get
      {
        return m_minItemCount;
      }
      set
      {
        if( value != m_minItemCount )
          m_minItemCount = value;
      }
    }
  }

Inheritance Hierarchy

System.Object
   Xceed.Wpf.DataGrid.GroupConfigurationSelector
      Xceed.Wpf.DataGrid.FieldNameGroupConfigurationSelector
      Xceed.Wpf.DataGrid.LevelGroupConfigurationSelector

Requirements

Target Platforms: Windows 11, Windows 10, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

GroupConfigurationSelector Members
Xceed.Wpf.DataGrid Namespace