System.Windows.Forms.TreeView.OnBeforeExpand Method

Raises the TreeView.BeforeExpand event.

Syntax

protected virtual void OnBeforeExpand (TreeViewCancelEventArgs e)

Parameters

e
A System.Windows.Forms.TreeViewCancelEventArgs that contains the event data.

Remarks

Raising an event invokes the event handler through a delegate. For more information, see Raising an Event.

The TreeView.OnBeforeExpand(TreeViewCancelEventArgs) 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.

Requirements

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0