TreeView::OnTreeNodeExpanded Method (TreeNodeEventArgs^)
Raises the TreeNodeExpanded event of the TreeView control.
Assembly: System.Web (in System.Web.dll)
Parameters
- e
-
Type:
System.Web.UI.WebControls::TreeNodeEventArgs^
A TreeNodeEventArgs that contains event data.
The TreeNodeExpanded event is raised when a node is expanded in the TreeView control. This allows you to provide an event-handling method that performs a custom routine whenever this event occurs.
Note |
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If the SelectAction property for a node is set to Expand or SelectExpand, the TreeNodeExpanded event is also raised when that node is clicked in the TreeView control. |
Raising an event invokes the event handler through a delegate. For more information, see NIB: Consuming Events.
The OnTreeNodeExpanded method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.
Notes to Inheritors:
When overriding the OnTreeNodeExpanded method in a derived class, be sure to call the OnTreeNodeExpanded method for the base class so that registered delegates receive the event.
Available since 2.0
