TableView.CanUnselectCell Event

Occurs in multiple cell selection mode when a user tries to unselect a grid cell and allows you to prevent this operation for a particular cell.

Namespace: DevExpress.Xpf.Grid

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

NuGet Package: DevExpress.Wpf.Grid.Core

Declaration

C#

public event CanUnselectCellEventHandler CanUnselectCell

VB.NET

Public Event CanUnselectCell As CanUnselectCellEventHandler

Event Data

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

Property	Description
CanUnselectCell	Gets or sets whether an end-user can unselect the processed cell.
Column	Gets a column to which the processed cell belongs.
Row	Gets a data row object that corresponds to the processed row (or treelist node).
RowHandle	Gets the handle of a row to which the processed cell belongs.
View	Gets a GridControl view to which the processed cell belongs.

Remarks

Handle the CanUnselectCell event to dynamically specify cells that users cannot unselect.

Set the CanUnselectCellEventArgs.CanUnselectCell property to false to keep the processed cell selected. Use the CanUnselectCellEventArgs.Row, CanUnselectCellEventArgs.RowHandle, and CanUnselectCellEventArgs.Column event argument properties to obtain the processed cell.

XAML

<dxg:GridControl ...
                 SelectionMode="Cell">
    <dxg:GridControl.View>
        <dxg:TableView ...
                       CanSelectCell="View_CanSelectCell"
                       CanUnselectCell="View_CanUnselectCell">
        </dxg:TableView>
    </dxg:GridControl.View>
</dxg:GridControl>

C#

void View_CanSelectCell(object sender, CanSelectCellEventArgs e) {
    e.CanSelectCell = e.Column.FieldName != "Visits";
}
void View_CanUnselectCell(object sender, CanUnselectCellEventArgs e) {
    e.CanUnselectCell = e.Column.FieldName != "Birthday";
}

VB.NET

Class SurroundingClass
    Private Sub View_CanSelectCell(ByVal sender As Object, ByVal e As CanSelectCellEventArgs)
        e.CanSelectCell = e.Column.FieldName <> "Visits"
    End Sub

    Private Sub View_CanUnselectCell(ByVal sender As Object, ByVal e As CanUnselectCellEventArgs)
        e.CanUnselectCell = e.Column.FieldName <> "Birthday"
    End Sub
End Class

Handle the TableView.CanSelectCell event to specify cells that users cannot select.

Refer to the following help topic for more information: Cell Selection.