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TreeViewAction Enumeration

Specifies the action that raised a TreeViewEventArgs event.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public enum TreeViewAction

Member nameDescription
ByKeyboardThe event was caused by a keystroke.
ByMouseThe event was caused by a mouse operation.
CollapseThe event was caused by the TreeNode collapsing.
ExpandThe event was caused by the TreeNode expanding.
UnknownThe action that caused the event is unknown.

This enumeration is used by members such as the TreeViewEventArgs constructor.

The following code example demonstrates how to use the TreeView.AfterSelect event and the TreeViewAction enumeration. To run the example paste the following code in a form containing a TreeView control named TreeView1. This example assumes TreeView1 is populated with items and the TreeView.AfterSelect event is connected to the event-handling method defined in the sample.

	// Handle the After_Select event. 
	private void TreeView1_AfterSelect(System.Object sender, 
		System.Windows.Forms.TreeViewEventArgs e)
	{

		// Vary the response depending on which TreeViewAction 
		// triggered the event.  
		switch((e.Action))
		{
			case TreeViewAction.ByKeyboard:
				MessageBox.Show("You like the keyboard!");
				break;
			case TreeViewAction.ByMouse:
				MessageBox.Show("You like the mouse!");
				break;
		}
	}
		The following class inherits from the Button class and overrides
		the OnMouseHover and OnMouseMove methods to give the button
		some special behavior. To use this example create a new form and copy paste this class in the same file, after the form class.  Add a button of
		type FunButton, defined in the code example, to the form. 

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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