递归生成树Treeview

递归生成树Treeview SqlConnection Conn = new SqlConnection("server=.;database=Test;uid=sa;pwd=sa");

        DataSet ds;

        protected void Page_Load(object sender, EventArgs e)

        {

            Conn.Open();

            this.createDataSet();

            Conn.Close();

            this.InitTree(tvMenu.Nodes, "0");

        }

        private DataSet createDataSet()//返回数据库表

        {

            ds = new DataSet();

            string sqlStr = "select * from Tree ";

            SqlDataAdapter cmdSelect = new SqlDataAdapter(sqlStr, Conn);

            cmdSelect.Fill(ds, "Tree");

            return ds;

        }

        protected void InitTree(TreeNodeCollection Nds, string parentId)//用递归方法动态生成节点

        {

            DataView dv = new DataView();

            TreeNode tmpNode;

            dv.Table = ds.Tables["Tree"];

            dv.RowFilter = "ParentId=" + "'" + parentId + "'";

            foreach (DataRowView drv in dv)

            {

                tmpNode = new TreeNode();

                tmpNode.Value = drv["Id"].ToString();

                tmpNode.Text = drv["Name"].ToString();

                if (drv["ParentId"].ToString() == "0")

                {

                    tmpNode.SelectAction = TreeNodeSelectAction.None;

                }

                else

                {

                    tmpNode.NavigateUrl = drv["Url"].ToString();//设置超链接

                }

                tmpNode.ExpandAll();//展开所有子节点

                Nds.Add(tmpNode);

                this.InitTree(tmpNode.ChildNodes, tmpNode.Value);

            }

        }