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());            }        }

        ///         /// 節點變化時候，頁面顯示操作        ///         ///         ///         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);

        }