动态加载TreeNode -- ComponentArt TreeView

<% @ Control Language="C#" AutoEventWireup="true" CodeFile="ProjectTree.ascx.cs" Inherits="Modules_Other_ProjectTree"  %>
<% @ Register TagPrefix="ComponentArt" Namespace="ComponentArt.Web.UI" Assembly="ComponentArt.Web.UI"  %>
< ComponentArt:TreeView  id ="TreeView1"  Height ="350px"  Width ="100%"  
    DragAndDropEnabled ="false"  
    NodeEditingEnabled ="false"
    KeyboardEnabled ="true"
    CssClass ="TreeView"  
    NodeCssClass ="TreeNode"  
    SelectedNodeCssClass ="SelectedTreeNode"  
    HoverNodeCssClass ="HoverTreeNode"
    NodeEditCssClass ="NodeEdit"
    LineImageWidth ="19"  
    LineImageHeight ="20"
    DefaultImageWidth ="16"  
    DefaultImageHeight ="16"
    ItemSpacing ="0"  
    ImagesBaseUrl ="images/"
    NodeLabelPadding ="3"
    ShowLines ="true"  
    LineImagesFolderUrl ="images/lines/"
    EnableViewState ="true"
    runat ="server"  LoadingFeedbackText ="Loading "   >
   </ ComponentArt:TreeView >

protected   void  Page_Load( object  sender, EventArgs e)
     {
        if (!Page.IsPostBack)
         {
            TreeViewNode rootnode = new TreeViewNode();
            rootnode.Text = "项目";
            rootnode.Expanded = true;
            TreeView1.Nodes.Add(rootnode);

            ProjectDB pdb = new ProjectDB();
            IList<Project.Model.Project> plist = pdb.ProjectList();
            foreach (Project.Model.Project p in plist)
             {
                 TreeViewNode pnode = new TreeViewNode();
                pnode.Text = p.PNO + " " + p.ProjectName;
                pnode.ID = p.Id.ToString();
                pnode.Value = "Project";
                pnode.ContentCallbackUrl = "Test.aspx?Pid=" + p.Id;
                rootnode.Nodes.Add(pnode);
            } 
        }      
    }

<% @ Page Language="C#" AutoEventWireUp="true"  %>
<% @ import Namespace="System.Threading"  %>
<% @ import Namespace="System.IO"  %>
<% @ Import Namespace="Project.DAO"  %>
<% @ Import Namespace="Project.Model"  %>
<% @ import Namespace="ComponentArt.Web.UI"  %>
<% @ Import Namespace="System.Collections.Generic"  %>
<%  Response.ContentType = "text/xml";  %>
< script  language ="C#"  runat ="server"  type ="text/C#" >
    void Page_Load(Object sender, EventArgs e)
     {
        ComponentArt.Web.UI.TreeView TreeView1 = new ComponentArt.Web.UI.TreeView();

        ProjectDB pdb = new ProjectDB();
        if (Request.QueryString["Pid"] != null && Request.QueryString["Pid"] != "")
         {
            int pid = int.Parse(Request.QueryString["Pid"]);

            IList<ProjectStep> pslist = pdb.GetPstepByPid(pid, 0);
            foreach (ProjectStep ps in pslist)
             {
                TreeViewNode node = new TreeViewNode();

                node.Text =  ps.StepName;
                node.ID = ps.Id.ToString();
                node.Value = "Step";
                
                TreeView1.Nodes.Add(node);
            }
        }

        Response.Write(TreeView1.GetXml());
    }
</ script >