ColumnView.SelectionChanging Event

Allows you to specify whether users can select and unselect rows.

Namespace: DevExpress.XtraGrid.Views.Base

Assembly: DevExpress.XtraGrid.v23.2.dll

NuGet Packages: DevExpress.Win.Grid, DevExpress.Win.Navigation

Declaration

C#

[DXCategory("Property Changed")]
public event SelectionChangingEventHandler SelectionChanging

VB.NET

<DXCategory("Property Changed")>
Public Event SelectionChanging As SelectionChangingEventHandler

Event Data

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

Property	Description
Action	Gets an action that describes how the collection of selected rows is about to change.
Cancel	Gets or sets a value indicating whether the event should be canceled. Inherited from CancelEventArgs.
ControllerRow	Gets the processed row handle.

Remarks

The SelectionChanging event is raised in multiple selection mode before a user selects/unselects a row (rows). This event allows you to cancel the action.

The following code sample does not allow users to select the first 5 rows:

C#

gridView1.SelectionChanging += (s, e) => {
    e.Cancel = e.Action == CollectionChangeAction.Add && e.ControllerRow <= 4;
};

VB.NET

gridView1.SelectionChanging += Function(s, e)
    e.Cancel = e.Action = CollectionChangeAction.Add AndAlso e.ControllerRow <= 4
End Function