TreeNodeCollection.Add Method (TreeNode)
.NET Framework (current version)
Appends the specified TreeNode object to the end of the TreeNodeCollection object.
Assembly: System.Web (in System.Web.dll)
Use the Add method to append the specified TreeNode object to the end of the TreeNodeCollection.
Note |
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The TreeNodeCollection allows you to add null references (Nothing in Visual Basic), as well as duplicate TreeNode objects. |
As an alternative, you can insert a TreeNode object in the TreeNodeCollection at a specific index by using the AddAt method.
The following example demonstrates how to use the Add method to programmatically add a node to the TreeNodeCollection. Notice that the Nodes and ChildNodes properties each return a TreeNodeCollection object.
<%@ 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_Load(Object sender, EventArgs e) { if (!IsPostBack) { // Use the Add and Remove methods to programmatically // remove the Appendix C node and replace it with a new // node. LinksTreeView.Nodes.Remove(LinksTreeView.Nodes[3]); LinksTreeView.Nodes.Add(new TreeNode("New Appendix C")); // Use the AddAt and RemoveAt methods to programmatically // remove the Chapter One node and replace it with a new node. LinksTreeView.Nodes[0].ChildNodes.RemoveAt(0); LinksTreeView.Nodes[0].ChildNodes.AddAt(0, new TreeNode("New Chapter One")); // Use the Clear method to remove all the child nodes of the // Chapter Two node. LinksTreeView.Nodes[0].ChildNodes[1].ChildNodes.Clear(); } } </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>TreeNodeCollection Example</title> </head> <body> <form id="form1" runat="server"> <h3>TreeNodeCollection Example</h3> <asp:TreeView id="LinksTreeView" Font-Names= "Arial" ForeColor="Blue" 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" Expanded="true"> <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> </form> </body> </html>
.NET Framework
Available since 2.0
Available since 2.0
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