遞歸小應用 .

 

private void BindTree()
        {
            string sql = "select ID,[name],byte from Sut";
            DataTable dt = SQLHelper.ExecuteDataTable(sql);//獲取數據源
            int s = dt.Rows.Count;//
            DataView dv = new DataView(dt);
            dv.RowFilter = "byte=0";
            foreach (DataRowView drv in dv)
            {
                TreeNode node = new TreeNode();
                node.Text = drv["Name"].ToString();//顯示的文本
                node.Tag = drv["ID"].ToString();//不顯示的 文本 值
                treeView1.Nodes.Add(node);//添加到根節點
                AddReplies(dt, node);//遞歸函數
            }
        }
        protected void AddReplies(DataTable dt, TreeNode node)
        {
            DataView dv = new DataView(dt);
            dv.RowFilter = "byte='" + node.Tag + "'";//過濾 node。Value 爲上級的treeNode 值
            foreach (DataRowView row in dv)
            {
                TreeNode replyNode = new TreeNode();//新建一個節點
                replyNode.Text = row["Name"].ToString();//顯示的文本
                replyNode.Tag = row["ID"].ToString();//不顯示的 文本 值
                node.Nodes.Add(replyNode);//添加到子節點
                AddReplies(dt, replyNode);//繼續遞歸函數
            }
        }