TreeNode Constructor ()
.NET Framework (current version)
Initializes a new instance of the TreeNode class without text or a value.
Assembly: System.Web (in System.Web.dll)
The following code example demonstrates how to use this constructor to dynamically add a node to 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 Page_Init(Object sender, EventArgs e) { if(!IsPostBack) { // Add the first tree to the TreeView control. CreateTree("Section 1"); // Add the second tree to the TreeView control. CreateTree("Section 2"); } } void CreateTree(String NodeText) { // Create the root node using the default constructor. TreeNode root = new TreeNode(); root.Text = NodeText; // Use the ChildNodes property of the root TreeNode to add child nodes. // Create the node using the constructor that takes the text parameter. root.ChildNodes.Add(new TreeNode("Topic 1")); // Create the node using the constructor that takes the text and value parameters. root.ChildNodes.Add(new TreeNode("Topic 2", "Value 2")); // Create the node using the constructor that takes the text, value, // and imageUrl parameters. root.ChildNodes.Add(new TreeNode("Topic 3", "Value 3", "Image1.jpg")); // Create the node using the constructor that takes the text, value, // imageUrl, navigateUrl, and target parameters. root.ChildNodes.Add(new TreeNode("Topic 4", "Value 4", "Image1.jpg", "http://www.microsoft.com", "_blank")); // Add the root node to the Nodes collection of the TreeView control. DynamicTreeView.Nodes.Add(root); } </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>TreeNode Constructor Example</title> </head> <body> <form id="form1" runat="server"> <h3>TreeNode Constructor Example</h3> <asp:TreeView id="DynamicTreeView" EnableClientScript="false" ExpandDepth="2" runat="server"> </asp:TreeView> </form> </body> </html>
.NET Framework
Available since 2.0
Available since 2.0
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