GridControl.CustomRowFilterCommand Property

Gets or sets a command that uses custom rules to filter rows.

Namespace: DevExpress.Xpf.Grid

Assembly: DevExpress.Xpf.Grid.v23.2.dll

NuGet Package: DevExpress.Wpf.Grid.Core

Declaration

C#

public ICommand<RowFilterArgs> CustomRowFilterCommand { get; set; }

VB.NET

Public Property CustomRowFilterCommand As ICommand(Of RowFilterArgs)

Property Value

Type	Description
ICommand<RowFilterArgs>	A command that uses custom rules to filter rows.

Remarks

Bind a command to the CustomRowFilterCommand property to maintain a clean MVVM pattern. The command works like a CustomRowFilter event handler and allows you to specify custom filter rules in a View Model.

Use the CustomRowFilterCommand property to apply a custom filter condition. The custom filter takes priority over the filter criteria applied in a column’s Drop-down Filter or the Automatic Filter Row.

To apply a custom filter condition, create a command that uses custom rules to filter rows and assign this command to the CustomRowFilterCommand property. You can use the RowFilterArgs.Item property to get the processed data source record or RowFilterArgs.SourceIndex property to get the record’s index in a data source. The RowFilterArgs.DefaultVisibility property returns the row’s visibility state based on the applied filter.

To hide or show a row, specify the RowFilterArgs.Visible property.

Note

The CustomRowFilterCommand property does not work in Server Mode.

Refer to the following help topic for more information: Filtering and Searching.

Example

The following example demonstrates how to apply a custom filter condition to the GridControl:

View Example: How to Apply a Custom Filter Condition

MainWindow.xaml

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="36" />
        <RowDefinition Height="*" />
    </Grid.RowDefinitions>
    <StackPanel Grid.Row="0" Orientation="Horizontal">
        <CheckBox Margin="7,0,7,0"
                  VerticalAlignment="Center" 
                  Content="Hide Even Rows"
                  IsChecked="{Binding HideEvenItems}" />
        <CheckBox VerticalAlignment="Center"
                  Content="Hide Odd Rows"
                  IsChecked="{Binding HideOddItems}" />
    </StackPanel>
    <dxg:GridControl Grid.Row="1" 
                     AutoGenerateColumns="AddNew"
                     ItemsSource="{Binding Items}"
                     CustomRowFilterCommand="{Binding CustomRowFilterCommand}">
        <dxg:GridControl.View>
            <dxg:TableView AutoWidth="True"
                           ShowGroupPanel="False"
                           NavigationStyle="None" />
        </dxg:GridControl.View>
    </dxg:GridControl>
</Grid>

MainViewModel.cs

using DevExpress.Mvvm;
using DevExpress.Mvvm.DataAnnotations;
using DevExpress.Mvvm.Xpf;
// ...
public class MainViewModel : ViewModelBase {
    public bool HideEvenItems {
        get { return GetValue<bool>(nameof(HideEvenItems)); }
        set { SetValue(value, UpdateFiltrationLogic, nameof(HideEvenItems)); }
    }
    public bool HideOddItems {
        get { return GetValue<bool>(nameof(HideOddItems)); }
        set { SetValue(value, UpdateFiltrationLogic, nameof(HideOddItems)); }
    }
    public ICommand<RowFilterArgs> CustomRowFilterCommand {
        get { return GetValue<ICommand<RowFilterArgs>>(nameof(CustomRowFilterCommand)); }
        set { SetValue(value, nameof(CustomRowFilterCommand)); }
    }
    public ObservableCollection<object> Items { get; }
    public MainViewModel() {
        Items = new ObservableCollection<object>(GetItems());
        UpdateFiltrationLogic();
    }
    static IEnumerable<object> GetItems() {
        return new object[] { "A", "B", "C", "D", "E", "F", "G", "H" };
    }

    void UpdateFiltrationLogic() {
        CustomRowFilterCommand = new DelegateCommand<RowFilterArgs>(CustomRowFilter);
    }

    void CustomRowFilter(RowFilterArgs args) {
        if(HideOddItems && args.SourceIndex % 2 == 1)
            args.Visible = false;
        if(HideEvenItems && args.SourceIndex % 2 == 0)
            args.Visible = false;
    }
}

MainViewModel.vb

Imports DevExpress.Mvvm
Imports DevExpress.Mvvm.Xpf
' ...
Public Class MainViewModel
    Inherits ViewModelBase

    Public Property HideEvenItems As Boolean
        Get
            Return GetValue(Of Boolean)(NameOf(MainViewModel.HideEvenItems))
        End Get

        Set(ByVal value As Boolean)
            SetValue(value, New Action(AddressOf UpdateFiltrationLogic), NameOf(MainViewModel.HideEvenItems))
        End Set
    End Property

    Public Property HideOddItems As Boolean
        Get
            Return GetValue(Of Boolean)(NameOf(MainViewModel.HideOddItems))
        End Get

        Set(ByVal value As Boolean)
            SetValue(value, New Action(AddressOf UpdateFiltrationLogic), NameOf(MainViewModel.HideOddItems))
        End Set
    End Property

    Public Property CustomRowFilterCommand As ICommand(Of RowFilterArgs)
        Get
            Return GetValue(Of ICommand(Of RowFilterArgs))(NameOf(MainViewModel.CustomRowFilterCommand))
        End Get

        Set(ByVal value As ICommand(Of RowFilterArgs))
            SetValue(value, NameOf(MainViewModel.CustomRowFilterCommand))
        End Set
    End Property

    Public ReadOnly Property Items As ObservableCollection(Of Object)

    Public Sub New()
        Items = New ObservableCollection(Of Object)(GetItems())
        UpdateFiltrationLogic()
    End Sub

    Private Shared Function GetItems() As IEnumerable(Of Object)
        Return New Object() {"A", "B", "C", "D", "E", "F", "G", "H"}
    End Function

    Private Sub UpdateFiltrationLogic()
        CustomRowFilterCommand = New DelegateCommand(Of RowFilterArgs)(AddressOf CustomRowFilter)
    End Sub

    Private Sub CustomRowFilter(ByVal args As RowFilterArgs)
        If HideOddItems AndAlso args.SourceIndex Mod 2 = 1 Then args.Visible = False
        If HideEvenItems AndAlso args.SourceIndex Mod 2 = 0 Then args.Visible = False
    End Sub
End Class

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the CustomRowFilterCommand property.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

XAML

wpf-data-grid-implement-custom-filtering/CS/CustomFiltering_MVVM/MainWindow.xaml#L27

             ItemsSource="{Binding Items}"
             CustomRowFilterCommand="{Binding CustomRowFilterCommand}">
<dxg:GridControl.View>

wpf-data-grid-specify-row-visibility-in-viewmodel/CS/CustomFilteringMVVM/MainWindow.xaml#L32

<dxg:GridControl AutoGenerateColumns="AddNew" Grid.Row="1" x:Name="grid" Grid.Column="1" ItemsSource="{Binding Data}"
                 CurrentItem="{Binding CurrentVisibleItem}" CustomRowFilterCommand="{Binding FilterExclusionsCommand}"/>
<dxg:GridControl AutoGenerateColumns="AddNew" Grid.Row="1" Grid.Column="2" ItemsSource="{Binding ExcludedData}"