TreeView.OnTreeNodeCollapsed(TreeNodeEventArgs) Method

Definition

Raises the TreeNodeCollapsed event of the TreeView control.

C#
protected virtual void OnTreeNodeCollapsed(System.Web.UI.WebControls.TreeNodeEventArgs e);

Parameters

e
TreeNodeEventArgs

A TreeNodeEventArgs that contains event data.

Remarks

The TreeNodeCollapsed event is raised when a node is collapsed in the TreeView control. This allows you to provide an event-handling method that performs a custom routine whenever this event occurs.

Raising an event invokes the event handler through a delegate. For more information about how to handle events, see Handling and Raising Events.

The OnTreeNodeCollapsed 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 OnTreeNodeCollapsed(TreeNodeEventArgs) method in a derived class, be sure to call the OnTreeNodeCollapsed(TreeNodeEventArgs) method for the base class so that registered delegates receive the event.

Applies to

Product Versions
.NET Framework 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1

See also