TreeView::SelectedNode Property
Namespace: System.Web.UI.WebControls
Assembly: System.Web (in System.Web.dll)
The text of a node in the TreeView control can be in one of two modes: selection mode and navigation mode. By default, a node is in selection mode. To put a node into navigation mode, set the NavigateUrl property for the node to a value other than an empty string (""). To put a node into selection mode, set the NavigateUrl property for the node to empty string ("").
When a node is in selection mode, the user can select a node by clicking on the text in the node. Use the SelectedNode property to determine which node is selected in the TreeView control.
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A node cannot be selected when the TreeView control displays hyperlinks. When hyperlinks are displayed, the SelectedNode property always returns nullptr. |
When the user selects a different node in the TreeView control by clicking the text in the new node, the SelectedNodeChanged event is raised, by default. You can specify a different event by setting the SelectAction property for the property. The following table lists the available options.
Selection action | Description |
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Toggles the node between expanded and collapsed. Raises the TreeNodeExpanded or TreeNodeCollapsed event, as appropriate. | |
Raises no events when a node is selected. | |
Raises the SelectedNodeChanged event when a node is selected. | |
Raises both the SelectedNodeChanged and TreeNodeExpanded events when a node is selected. Nodes are only expanded, never collapsed. |
Note |
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The HoverNodeStyle is not rendered for a node with its SelectAction property set to TreeNodeSelectAction.None. |
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
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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