Provides information on a distinct value extracted from the underlying data source and allows a new one to be provided in its stead.
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 provide custom distinct values that will display the only the month in columns that display DateTime values and that will filter according to a value range for a decimal column.
<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}"
AutoFilterMode="And"
DefaultCalculateDistinctValues="False">
<xcdg:DataGridCollectionViewSource.ItemProperties>
<xcdg:DataGridItemProperty Name="OrderDate"
QueryDistinctValue="DataGridItemProperty_QueryDistinctValue_Date"
CalculateDistinctValues="True"/>
<xcdg:DataGridItemProperty Name="RequiredDate"
QueryDistinctValue="DataGridItemProperty_QueryDistinctValue_Date"
CalculateDistinctValues="True" />
<xcdg:DataGridItemProperty Name="ShippedDate"
QueryDistinctValue="DataGridItemProperty_QueryDistinctValue_Date"
CalculateDistinctValues="True" />
<xcdg:DataGridItemProperty Name="Freight"
QueryDistinctValue="DataGridItemProperty_QueryDistinctValue_Range"
CalculateDistinctValues="True" />
</xcdg:DataGridCollectionViewSource.ItemProperties>
</xcdg:DataGridCollectionViewSource>
</Grid.Resources>
<xcdg:DataGridControl x:Name="OrdersGrid"
ItemsSource="{Binding Source={StaticResource cvs_orders}}"/>
</Grid>
Private Sub DataGridItemProperty_QueryDistinctValue_Date( ByVal sender As Object, ByVal e As QueryDistinctValueEventArgs )
If TypeOf e.DataSourceValue Is DateTime Then
e.DistinctValue = CDate( e.DataSourceValue ).ToString( "MMMM" )
End If
End Sub
Private Sub DataGridItemProperty_QueryDistinctValue_Range( ByVal sender As Object, ByVal e As QueryDistinctValueEventArgs )
If TypeOf e.DataSourceValue Is Decimal Then
Dim value As Decimal = CDec( e.DataSourceValue )
If value <= 100 Then
e.DistinctValue = "0 - 100"
ElseIf( value > 100 And value <= 500 ) Then
e.DistinctValue = "101 - 500"
Else
e.DistinctValue = "500+"
End If
End If
End Sub
private void DataGridItemProperty_QueryDistinctValue_Date( object sender, QueryDistinctValueEventArgs e )
{
if( e.DataSourceValue is DateTime )
{
e.DistinctValue = ( ( DateTime )e.DataSourceValue ).ToString( "MMMM" );
}
}
private void DataGridItemProperty_QueryDistinctValue_Range( object sender, QueryDistinctValueEventArgs e )
{
if( e.DataSourceValue is decimal )
{
decimal value = ( decimal )e.DataSourceValue;
if( value <= 100 )
{
e.DistinctValue = "0 - 100";
}
else if( value > 100 && value <= 500 )
{
e.DistinctValue = "101 - 500";
}
else
{
e.DistinctValue = "500+";
}
}
}
System.Object
System.EventArgs
Xceed.Wpf.DataGrid.QueryDistinctValueEventArgs
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
