winform 递归循环阻止机构

private void GetTree()
        {
            DataTable dt = new DataTable();
            var sql = @"
select OUID,ParentOUID,OUCode,OUName,OUShortName from tbl_Base_OUInfo where LEN(oucode) in(10,15) 
order by LEN(oucode),OrderNo,ParentOUID";
            dt = dataprovider.FillDataTable(sql, CommandType.Text);
            var list = DatatableToHash(dt);

            var r = new List<Hashtable>();
            Hashtable root = new Hashtable();
            //集团公司
            root = list.Find(p => p["OUID"].ToString() == "CCB93E1A-CC22-4120-B99F-62E941CC6E4A".ToLower());
            TreeData(list, root, "CCB93E1A-CC22-4120-B99F-62E941CC6E4A".ToLower());
            r.Add(root);



            TreeNode root1 = new TreeNode(r[0]["OUName"].ToString());
            root1.Name = r[0]["OUID"].ToString();

            if (r[0].ContainsKey("children"))
            {
                var children = r[0]["children"] as List<Hashtable>;
                TreeBindData(root1, children);
            }
            

            this.treeView1.Nodes.AddRange(new System.Windows.Forms.TreeNode[] { root1 });

            
        }
private void TreeBindData(TreeNode node,List<Hashtable> list)
        {
            
            for(int i = 0; i < list.Count; i++)
            {
                if (list[i].ContainsKey("children"))
                {
                    var children = list[i]["children"] as List<Hashtable>;
                    TreeNode root1 = new TreeNode(list[i]["OUName"].ToString());
                    root1.Name = list[i]["OUID"].ToString();
                    TreeBindData(root1, children);
                    node.Nodes.Add(root1);
                }
                else {
                    TreeNode root1 = new TreeNode(list[i]["OUName"].ToString());
                    root1.Name = list[i]["OUID"].ToString();
                    node.Nodes.Add(root1);
                }
            }
        }

　　 效果：