GridControl.GroupRowExpanding Event

Occurs when a group row is about to be expanded, allowing cancellation of the action.

Namespace: DevExpress.WinUI.Grid

Assembly: DevExpress.WinUI.Grid.v22.1.dll

NuGet Package: DevExpress.WinUI

Declaration

C#

public event RowAllowEventHandler GroupRowExpanding

VB.NET

Public Event GroupRowExpanding As RowAllowEventHandler

Event Data

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

Property	Description
Allow	Gets or sets whether to expand/collapse the group row.
Row	Gets the processed row. Inherited from RowEventArgs.
RowHandle	Gets the processed row’s handle. Inherited from RowEventArgs.
Source	Gets the GridControl that raised this event. Inherited from RowEventArgs.

Remarks

The GroupRowExpanding event is raised before a group row is expanded by an end-user or in code, allowing you to cancel this action. The group row is identified by its handle via the RowHandle property. To prevent the group row from being expanded, set the event parameter’s Allow parameter to false.

The GridControl.ExpandAllGroups method allows you to expand all group rows. In this instance, the GroupRowExpanding event is raised only once. The event parameter’s RowHandle property returns an invalid row handle (DataControlBase.InvalidRowHandle).

After the group row has been expanded, the GridControl.GroupRowExpanded event is raised.