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Xceed Toolkit Plus for WPF v5.0 Documentation
Xceed.Wpf.DataGrid Assembly / Xceed.Wpf.DataGrid Namespace / DataGridGroupDescription Class / SortComparer Property
Example


In This Topic
    SortComparer Property (DataGridGroupDescription)
    In This Topic
    Gets or sets the data comparer that will be used to sort the groups in a grid.
    Syntax
    'Declaration
 
Public Property SortComparer As IComparer
    'Usage
 
Dim instance As DataGridGroupDescription
Dim value As IComparer
 
instance.SortComparer = value
 
value = instance.SortComparer
    public IComparer SortComparer {get; set;}

    Property Value

    The Comparer that will be used to sort the groups in a grid. Can be a null reference (Nothing in Visual Basic).
    Remarks
    If a null reference (Nothing in Visual Basic), the default data-type comparer will be used.
    Example

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

    This example demonstrates how to create a custom group description by deriving from the DataGridGroupDescription class and overriding the GroupNameFromItem method. The custom group description will group items according to the first letter in the value received as a parameter.
    Imports System
Imports System.Collections.Generic
Imports System.Text
Imports Xceed.Wpf.DataGrid
Imports System.Collections
Imports System.Globalization;

Namespace Xceed.Wpf.Documentation
  Public Class AlphabeticalGroupDescription

         Inherits DataGridGroupDescription
    Public Sub New()
      MyBase.New()
    End Sub

    Public Sub New(ByVal propertyName As String)
     MyBase.New(propertyName)
    End Sub
    Public Overrides Function GroupNameFromItem(ByVal item As Object, _
                                                ByVal level As Integer, _
                                                ByVal culture As CultureInfo) As Object
      Dim value As Object = MyBase.GroupNameFromItem(item, level, culture)
      Try
        Dim content As String = Convert.ToString(value)
        value = content.ToUpper().Substring(0, 1)
      Catch e1 As InvalidCastException
      End Try

      Return value
    End Function
  End Class
End Namespace
    This example demonstrates how to create a custom group description by deriving from the DataGridGroupDescription class and overriding the GroupNameFromItem method. The custom group description will group items according to the first letter in the value received as a parameter.
    using System;
using System.Collections.Generic;
using System.Text;
using Xceed.Wpf.DataGrid;
using System.Collections;

namespace Xceed.Wpf.Documentation
{

  public class AlphabeticalGroupDescription : DataGridGroupDescription
  {
    public AlphabeticalGroupDescription()
      : base()
    {
    }

    public AlphabeticalGroupDescription( string propertyName )
      : base( propertyName )
    {
    }
   

    public override object GroupNameFromItem( object item, int level,
                                              System.Globalization.CultureInfo culture )
    {
      object value = base.GroupNameFromItem( item, level, culture );
      try
      {
        string content = Convert.ToString( value );
        value = content.ToUpper().Substring( 0, 1 );

      }
      catch( InvalidCastException )
      {
      }
      return value;
    }
  }
}
    The following code demonstrates how to use the custom group description by adding it to the DataGridCollectionViewSource's GroupDescriptions property.
    <Grid xmlns:xcdg="http://schemas.xceed.com/wpf/xaml/datagrid"
     xmlns:local="clr-namespace:Xceed.Wpf.Documentation">
  <Grid.Resources>      
    <local:ConsonantVowelComparer x:Key="consonantVowelComparer"/>

    <xcdg:DataGridCollectionViewSource x:Key="cvs_orders"
                                       Source="{Binding
                                                Source={x:Static Application.Current},
                                                Path=Orders}">

     <xcdg:DataGridCollectionViewSource.GroupDescriptions>
       <local:AlphabeticalGroupDescription PropertyName="ShipCountry"
                                SortComparer="{StaticResource consonantVowelComparer}"/>
     </xcdg:DataGridCollectionViewSource.GroupDescriptions>
    </xcdg:DataGridCollectionViewSource>
  </Grid.Resources>
  <xcdg:DataGridControl x:Name="OrdersGrid"
                        ItemsSource="{Binding Source={StaticResource cvs_orders}}"/>
</Grid>
    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

    See Also

    Reference

    DataGridGroupDescription Class
    DataGridGroupDescription Members

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