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SelectedNode Property

TreeView.SelectedNode Property

Gets a TreeNode object that represents the selected node in the TreeView control.

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

[BrowsableAttribute(false)]
public TreeNode SelectedNode { get; }

Property Value

Type: System.Web.UI.WebControls.TreeNode
A TreeNode that represents the selected node in the TreeView.

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.

NoteNote

A node cannot be selected when the TreeView control displays hyperlinks. When hyperlinks are displayed, the SelectedNode property always returns null.

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

Expand

Toggles the node between expanded and collapsed. Raises the TreeNodeExpanded or TreeNodeCollapsed event, as appropriate.

None

Raises no events when a node is selected.

Select

Raises the SelectedNodeChanged event when a node is selected.

SelectExpand

Raises both the SelectedNodeChanged and TreeNodeExpanded events when a node is selected. Nodes are only expanded, never collapsed.

NoteNote

The HoverNodeStyle is not rendered for a node with its SelectAction property set to TreeNodeSelectAction.None.

The following code example demonstrates how to use the SelectedNode property to determine the value of the selected node in the TreeView control.



<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

    void Select_Change(Object sender, EventArgs e)
    {

        Message.Text = "You selected: " + LinksTreeView.SelectedNode.Text;

    }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >

    <head runat="server">
    <title>TreeView SelectedNodeStyle Example</title>
</head>
<body>
        <form id="form1" runat="server">

            <h3>TreeView SelectedNodeStyle Example</h3>

            <asp:TreeView id="LinksTreeView"
                Font-Names= "Arial"
                ForeColor="Blue"
                SelectedNodeStyle-ForeColor="Green"
                SelectedNodeStyle-VerticalPadding="0"
                OnSelectedNodeChanged="Select_Change"   
                runat="server">

                <LevelStyles>

                    <asp:TreeNodeStyle ChildNodesPadding="10" 
                        Font-Bold="true" 
                        Font-Size="12pt" 
                        ForeColor="DarkGreen"/>
                    <asp:TreeNodeStyle ChildNodesPadding="5" 
                        Font-Bold="true" 
                        Font-Size="10pt"/>
                    <asp:TreeNodeStyle ChildNodesPadding="5" 
                        Font-UnderLine="true" 
                        Font-Size="10pt"/>
                    <asp:TreeNodeStyle ChildNodesPadding="10" 
                        Font-Size="8pt"/>

                </LevelStyles>

                <Nodes>

                    <asp:TreeNode Text="Table of Contents"
                        SelectAction="None">

                        <asp:TreeNode Text="Chapter One">

                            <asp:TreeNode Text="Section 1.0">

                                <asp:TreeNode Text="Topic 1.0.1"/>
                                <asp:TreeNode Text="Topic 1.0.2"/>
                                <asp:TreeNode Text="Topic 1.0.3"/>

                            </asp:TreeNode>

                            <asp:TreeNode Text="Section 1.1">

                                <asp:TreeNode Text="Topic 1.1.1"/>
                                <asp:TreeNode Text="Topic 1.1.2"/>
                                <asp:TreeNode Text="Topic 1.1.3"/>
                                <asp:TreeNode Text="Topic 1.1.4"/>

                            </asp:TreeNode>

                        </asp:TreeNode>

                        <asp:TreeNode Text="Chapter Two">

                            <asp:TreeNode Text="Section 2.0">

                                <asp:TreeNode Text="Topic 2.0.1"/>
                                <asp:TreeNode Text="Topic 2.0.2"/>

                            </asp:TreeNode>

                        </asp:TreeNode>

                    </asp:TreeNode>
                    <asp:TreeNode Text="Appendix A" />
                    <asp:TreeNode Text="Appendix B" />
                    <asp:TreeNode Text="Appendix C" />

                </Nodes>

            </asp:TreeView>

            <br /><br />

            <asp:Label id="Message" runat="server"/>

        </form>
    </body>
</html>



.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

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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