DistinctValuesConstraint Property (DataGridCollectionViewBase)

Gets or sets a value representing the constraint applied to the DistinctValues when automatically filtering data items.

Syntax

Visual Basic
C#

'Declaration
 
Public Overridable Property DistinctValuesConstraint As DistinctValuesConstraint

'Usage
 
Dim instance As DataGridCollectionViewBase
Dim value As DistinctValuesConstraint
 
instance.DistinctValuesConstraint = value
 
value = instance.DistinctValuesConstraint

public virtual DistinctValuesConstraint DistinctValuesConstraint {get; set;}

Property Value

A DistinctValuesConstraint value representing the constraint applied to the DistinctValues when automatically filtering data items. By default, DistinctValuesConstraint.All.

Member	Description
All	No constraint is applied to the data items.
Filtered	Distinct values are constrained to the currently filtered list of values.
FilteredWithAllFilters	Distinct values are constrained to all filters currently applied to the grid (including filtering from a predicate and a FilterRow).

Remarks

The DistinctValuesConstraint property will be ignored when using a DataGridVirtualizingCollectionView or DataGridVirtualizingCollectionViewSource.

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 enable automatic filtering, disabling it for the columns that will not support it and filtering the distinct values of the ShipCity column.

XAML

<Grid> 
  <Grid.Resources> 
  <xcdg:DataGridCollectionViewSource x:Key="cvs_orders" 
                                     Source="{Binding Source={x:Static Application.Current}, 
                                                      Path=Orders}" 
                                     AutoFilterMode="And" 
                                     DistinctValuesConstraint="Filtered" 
                                     AutoCreateItemProperties="False">       
       <xcdg:DataGridCollectionViewSource.ItemProperties> 
         <xcdg:DataGridItemProperty Name="ShipCountry" 
                                          Title="Country"/> 
         <xcdg:DataGridItemProperty Name="ShipCity" 
                                   Title="City"/> 
        <xcdg:DataGridItemProperty Name="ShipAddress" 
                                   Title="Address"/> 
        <xcdg:DataGridItemProperty Name="ShipPostalCode" 
                                   Title="Postal Code"/> 
         <xcdg:DataGridItemProperty Name="ShipName" 
                                   Title="Name" 
                                   CalculateDistinctValues="False"/> 
         <xcdg:DataGridItemProperty Name="OrderDate" 
                                   Title="Order Date" 
                                   CalculateDistinctValues="False"/>                
         <xcdg:DataGridItemProperty Name="Freight" 
                                   CalculateDistinctValues="False"/> 
      </xcdg:DataGridCollectionViewSource.ItemProperties> 
    </xcdg:DataGridCollectionViewSource>        
  </Grid.Resources> 
  <xcdg:DataGridControl x:Name="OrdersGrid" 
                        ItemsSource="{Binding Source={StaticResource cvs_orders}}"/> 
</Grid>

Requirements

Reference

DataGridCollectionViewBase Class
DataGridCollectionViewBase Members