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TreeView::TreeNodeExpanded Event

.NET Framework 4.5

Occurs when a node is expanded in the TreeView control.

Namespace: System.Web.UI.WebControls
Assembly: System.Web (in System.Web.dll)

public:
 event TreeNodeEventHandler^ TreeNodeExpanded {
	void add (TreeNodeEventHandler^ value);
	void remove (TreeNodeEventHandler^ value);
}

ASP.NET

<asp:TreeView OnTreeNodeExpanded="TreeNodeEventHandler" />

Remarks

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
If the SelectAction property for a node is set to TreeNodeSelectAction.Expand or TreeNodeSelectAction.SelectExpand, the TreeNodeExpanded event is also raised when that node is clicked in the TreeView control.

For more information about handling events, see Consuming Events.

Examples

The following code example demonstrates how to use the TreeNodeExpanded event to update the content of a Label control when the user expands a node in the TreeView control.

C++

No code example is currently available or this language may not be supported.

Version Information

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0

Platforms

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.

Reference

TreeView Class

System.Web.UI.WebControls Namespace

OnTreeNodeExpanded

SelectAction

Other Resources

Consuming Events

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