FilterEditorControl.QueryOperands Event

Allows you to customize a list of available operand types.

Namespace: DevExpress.Xpf.Core.FilteringUI

Assembly: DevExpress.Xpf.Grid.v25.1.dll

NuGet Package: DevExpress.Wpf.Grid.Core

Declaration

C#

public event EventHandler<QueryOperandsEventArgs> QueryOperands

VB.NET

Public Event QueryOperands As EventHandler(Of QueryOperandsEventArgs)

Event Data

The QueryOperands event's data class is QueryOperandsEventArgs. The following properties provide information specific to this event:

Property	Description
AllowDateTimeFunctionOperand	Gets or sets whether to allow users to select date-time functions in the operand menu.
AllowPropertyOperand	Gets or sets whether to allow users to select properties in the operand menu.
AllowValueOperand	Gets or sets whether to allow users to select values in the operand menu.
DefaultOperand	Gets or sets an operand that is selected in the operand menu when users create a new filter condition.

Remarks

Run Demo: Filter Editor - Customize Operand Values

Xaml

<dxg:GridControl>
    <dxg:GridControl.Columns>
        <dxg:GridColumn FieldName="ProductName"/>
        <dxg:GridColumn FieldName="RequiredDate"/>
        <dxg:GridColumn FieldName="ShippedDate"/>
        <dxg:GridColumn FieldName="ShipCountry"/>
        <dxg:GridColumn FieldName="ShipCity"/>
        <dxg:GridColumn FieldName="ShipAddress"/>
    </dxg:GridControl.Columns>
    <dxg:GridControl.View>
        <dxg:TableView x:Name="view">
            <dxg:TableView.FilterEditorTemplate>
                <DataTemplate>
                    <dxfui:FilterEditorControl QueryOperands="FilterEditorControl_OnQueryOperands" />
                </DataTemplate>
            </dxg:TableView.FilterEditorTemplate>
        </dxg:TableView>
    </dxg:GridControl.View>
</dxg:GridControl> 

C#

void FilterEditorControl_OnQueryOperands(object sender, QueryOperandsEventArgs e) {
    switch(e.FieldName) {
        case "RequiredDate":
        case "ShippedDate":
            e.AllowPropertyOperand = true;
            e.AllowDateTimeFunctionOperand = true;
            e.AllowValueOperand = true;
            break;
    }
} 

VB.NET

Private Sub FilterEditorControl_OnQueryOperands(ByVal sender As Object, ByVal e As QueryOperandsEventArgs)
    Select Case e.FieldName
        Case "RequiredDate", "ShippedDate"
            e.AllowPropertyOperand = True
            e.AllowDateTimeFunctionOperand = True
            e.AllowValueOperand = True
    End Select
End Sub