winform 树形结构

        private UmDept[] entitys;

        private void Form1_Load(object sender, EventArgs e)
        {
            this.bindtree("0"); //无限级分类
        }

        /// <summary>
        /// 查找根节点(parent_ID为0的节点)的子节点
        /// </summary>
        /// <param name="parent_ID">参数，接收根节点ID</param>
        private void bindtree(string parent_ID)
        {
            entitys = wsProxy.getAllDept();//获取所有树形数据
            TreeNode node = new TreeNode();
            node.Text = "福田分局";
            node.Tag = "-1";
            this.treeView1.Nodes.Add(node);//把指定节点添加到控件中
            bindnode(node);
        }

        /// <summary>
        /// 递归遍历指定节点下的子节点
        /// </summary>
        /// <param name="nd">参数，接收节点对象</param>
        private void bindnode(TreeNode nd)
        {
            foreach (UmDept entity in entitys)
            {
                if (entity.parentId == int.Parse(nd.Tag.ToString()))
                {
                    TreeNode node = new TreeNode();
                    node.Text = entity.deptName;
                    node.Tag = entity.deptId.ToString();
                    nd.Nodes.Add(node);//把指定节点添加到控件中
                    bindnode(node);      
                }
            }
        }