winform创建树形菜单的无限级分类

tvType：treeview控件

contextMenuStrip1：右键菜单s

        #region 创建树形菜单
        /// <summary>
        /// 描述：创建树形菜单
        /// </summary>
        public void AddTree(int ParentID, TreeNode pNode)
        {
            DataTable dt = typeManager.GetAllList().Tables[0];
            DataView dvTree = new DataView(dt);

            //过滤ParentID,得到当前的所有子节点 
            dvTree.RowFilter = "ComType_ParentID = " + ParentID;

            foreach (DataRowView Row in dvTree)
            {
                TreeNode Node = new TreeNode();
                if (pNode == null)
                { //添加根节点 
                    Node.Text = Row["CommodityTypeName"].ToString();
                    Node.Name = Row["CommodityTypeName"].ToString();
                    Node.Tag = Row["CommodityTypeID"].ToString();
                    this.tvType.Nodes.Add(Node);
                    //Node.Expanded = true; 

                    AddTree(Int32.Parse(Row["CommodityTypeID"].ToString()), Node); //再次递归 
                }
                else
                { //添加当前节点的子节点 
                    Node.Text = Row["CommodityTypeName"].ToString();
                    Node.Name = Row["CommodityTypeName"].ToString();
                    Node.Tag = Row["CommodityTypeID"].ToString();
                    pNode.Nodes.Add(Node);
                    //Node.Expanded = true; 
                    AddTree(Int32.Parse(Row["CommodityTypeID"].ToString()), Node); //再次递归 
                }
            }
        }
        #endregion

        #region 主窗体加载
        /// <summary>
        /// 主窗体加载
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void CommodityForm_Load(object sender, EventArgs e)
        {
            this.tvType.Nodes.Clear();
            AddTree(0, (TreeNode)null);
        }
        #endregion

        #region treeview操作
        /// <summary>
        /// 新增同级
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void 新增同级ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            AddPeerType aptForm = new AddPeerType();
            DialogResult d = aptForm.ShowDialog();
            if (d == DialogResult.OK)
            {
                Emp.tagComType = "1";
                Emp.parentTagComType = "0";
                this.tvType.Nodes.Clear();
                AddTree(0, (TreeNode)null);
            }
        }
        /// <summary>
        /// 新增下一级
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void 新增下一级ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            AddLowerType altForm = new AddLowerType();
            DialogResult d = altForm.ShowDialog();
            if (d == DialogResult.OK)
            {
                Emp.tagComType = "1";
                Emp.parentTagComType = "0";
                this.tvType.Nodes.Clear();
                AddTree(0, (TreeNode)null);
            }
        }

        /// <summary>
        /// 单击树上一个节点事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tvType_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            if (e.Node.Text != "所有商品")
            {
                删除类别ToolStripMenuItem.Enabled = true;
                新增同级ToolStripMenuItem.Enabled = true;
                修改类别ToolStripMenuItem.Enabled = true;
                if (this.tvType.SelectedNode != null)
                {
                    util.Emp.tagComType = this.tvType.SelectedNode.Tag.ToString();
                    if (this.tvType.SelectedNode.Parent != null)
                    {
                        util.Emp.parentTagComType = this.tvType.SelectedNode.Parent.Tag.ToString();
                    }
                }
            }
            else
            {
                Emp.tagComType = "1";
                Emp.parentTagComType = "0";
                删除类别ToolStripMenuItem.Enabled = false;
                新增同级ToolStripMenuItem.Enabled = false;
                修改类别ToolStripMenuItem.Enabled = false;
            }
        }
        #endregion