TreeNode Constructor (String, String, String)
Initializes a new instance of the TreeNode class using the specified text, value, and image URL.
Assembly: System.Web (in System.Web.dll)
Parameters
- text
-
Type:
System.String
The text that is displayed in the TreeView control for the node.
- value
-
Type:
System.String
The supplemental data associated with the node, such as data used for handling postback events.
- imageUrl
-
Type:
System.String
The URL to an image that is displayed next to the node.
Use this constructor to initialize a new instance of the TreeNode class using the text, value, and image URL specified by the text, value, and imageUrl parameters, respectively.
The following table shows initial property values for an instance of TreeNode.
Property | Initial value |
|---|---|
The value of the text parameter. | |
The value of the value parameter. | |
The value of the imageUrl parameter. |
The following code example demonstrates how to use this constructor to dynamically add a node to the TreeView control.
<%@ Page Language="VB" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server"> Sub Page_Init(ByVal sender As Object, ByVal e As EventArgs) If Not IsPostBack Then ' Add the first tree to the TreeView control. CreateTree("Section 1") ' Add the second tree to the TreeView control. CreateTree("Section 2") End If End Sub Sub CreateTree(ByVal NodeText As String) ' Create the root node using the default constructor. Dim root As TreeNode = 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) End Sub </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>
Available since 2.0