C# 递归TreeView 与根据选择的节点获得整个节点路径

 private void loadtree()
        {
            GTree.Nodes.Clear();
            ds = workdo.GetDataSet();
            InitTree(GTree.Nodes, "0");
        }
        private void InitTree(TreeNodeCollection Nds, string parentid)
        {
            DataView dv = new DataView();
            TreeNode tmpNd = null;
            dv.Table = ds.Tables[0];
            dv.RowFilter = String.Format("ParentID='{0}'", parentid);
            foreach (DataRowView drv in dv)
            {
                tmpNd = new TreeNode();
                tmpNd.Text = (string)drv["WorkName"];//节点名称
                tmpNd.Value = (string)drv["ID"];
                //tmpNd.NavigateUrl = String.Format("?id={0}", drv["ID"]);//节点URL
                //tmpNd.ImageUrl = ""; //节点图片
                if (parentid == "0")
                    tmpNd.Expanded = true;
                else
                    tmpNd.Expanded = false;
                Nds.Add(tmpNd);
                InitTree(Nds[Nds.Count - 1].ChildNodes, drv["ID"].ToString());
            }
        }

        /// <summary>
        /// 節點變化時候，頁面顯示操作
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public event EventHandler SelectedNodeChanged;
        protected void GTree_SelectedNodeChanged(object sender, EventArgs e)
        {
            this.NodeID = GTree.SelectedNode.Value;
            //          = Tree1.SelectedNode.ValuePath;//value完整路径

            string str = "";

            TreeNode parentNode = GTree.SelectedNode.Parent;
            while (parentNode != null)
            {
                str = "/" + parentNode.Text + str;
                parentNode = parentNode.Parent;
            }
            this.NodeName = (str + "/" + GTree.SelectedNode.Text).Substring(1);  //Text完整路径名

            txtContent_TextTree.Value = this.NodeName;
            if (SelectedNodeChanged != null)
                SelectedNodeChanged(sender, e);

        }