GridControl.MasterRowExpanding Event

Enables you to specify whether a master row may be expanded.

Namespace: DevExpress.Xpf.Grid

Assembly: DevExpress.Xpf.Grid.v20.2.dll

NuGet Packages: DevExpress.WindowsDesktop.Wpf.Grid.Core, DevExpress.Wpf.Grid.Core

Declaration

C#

public event RowAllowEventHandler MasterRowExpanding

VB.NET

Public Event MasterRowExpanding As RowAllowEventHandler

Event Data

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

Property	Description
Allow	Gets or sets whether the operation is allowed.
Handled	Gets or sets a value that indicates the present state of the event handling for a routed event as it travels the route. Inherited from RoutedEventArgs.
OriginalSource	Gets the original reporting source as determined by pure hit testing, before any possible Source adjustment by a parent class. Inherited from RoutedEventArgs.
RoutedEvent	Gets or sets the RoutedEvent associated with this RoutedEventArgs instance. Inherited from RoutedEventArgs.
Row	Gets the processed row. Inherited from RowEventArgs.
RowHandle	Gets the processed row’s handle. Inherited from RowEventArgs.
Source	Gets or sets a reference to the object that raised the event. Inherited from RoutedEventArgs.

The event data class exposes the following methods:

Method	Description
InvokeEventHandler(Delegate, Object)	When overridden in a derived class, provides a way to invoke event handlers in a type-specific way, which can increase efficiency over the base implementation. Inherited from RoutedEventArgs.
OnSetSource(Object)	When overridden in a derived class, provides a notification callback entry point whenever the value of the Source property of an instance changes. Inherited from RoutedEventArgs.

Remarks

The MasterRowExpanding event fires when a master row is about to be expanded. This happens when an end-user tries to expand a row and when you call an appropriate method, such as GridControl.ExpandMasterRow. By using the event’s arguments you can identify the row being collapsed and determine whether to allow this operation.

Once a row has been expanded, the grid raises the GridControl.MasterRowExpanded event.