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效果图：

aspx页面代码：

Code
                                    <asp:TreeView ID="tvFloder" runat="server" OnTreeNodeExpanded="tvFloder_TreeNodeExpanded">
                                    </asp:TreeView>

cs代码：

Code

            TreeNode tn = new TreeNode();
            tn.Text = "项目" + daSystem.DISPLAYNAME + "的文件夹";
            string systemaddress = daSystem.Dlladdress;
            if (systemaddress.ToLower().LastIndexOf("\\bin") > 0)
                systemaddress = systemaddress.Substring(0, systemaddress.ToLower().LastIndexOf("\\bin"));

            TreeNode subtn 

= new TreeNode();
            subtn.Text = systemaddress.Substring(systemaddress.LastIndexOf("\\") + 1).Replace("\\", "/");

            subtn.Value 

= systemaddress;

            TreeNode tnThird 

= new TreeNode();
            tnThird.Text = "临时节点,只为显示+号";

            subtn.ChildNodes.Add(tnThird);

            tn.ChildNodes.Add(subtn);

            tvFloder.Nodes.Add(tn);

Code
        /// <summary>
        /// 填充子文件夹
        /// </summary>
        protected void tvFloder_TreeNodeExpanded(object sender, TreeNodeEventArgs e)
        {
            if (e.Node.Depth == 0)
                return;if (e.Node.ChildNodes[0].Value == "临时节点,只为显示+号")
                e.Node.ChildNodes.Clear();

            getDirectories(e.Node.Value, e.Node);
        }

Code
        /// <summary>
        /// 循环遍历获得某一目录下的所有文件信息
        /// </summary>
        /// <param name="path">目录名</param>
        /// <param name="tn">树节点</param>
        private static void getDirectories(string path, TreeNode tn)
        {
            if (string.IsNullOrEmpty(path))
                return;if (!Directory.Exists(path))
                return;string[] directories = Directory.GetDirectories(path);//先遍历这个目录下的文件夹
            foreach (string dir in directories)
            {
                TreeNode subtn = new TreeNode();
                subtn.Text = dir.Substring(dir.LastIndexOf("\\") + 1).Replace("\\", "/");
                subtn.Expanded = false;
                subtn.NavigateUrl = "javascript:ChooseFolder('" + dir.Substring(3, dir.Length - 3).Replace("\\", "/") + "')";
                
                getDirectories(dir, subtn);
                tn.ChildNodes.Add(subtn);
            }
        }