设置DataGrid多层表头

        /**//// <summary>
        /// 方法编号：05
        /// 方法名称：SetMultiLayerHeader
        /// 内容摘要：创建DataGrid多层表头
        /// 算法思路：建立一个ArrayList(1)来放置表征表头的ArrayList(2),通过这种结构来自动生成多层表头
        ///           数组2的格式要求为："内容，[rowspan/colspan]，[colspan/colspan的值]，[样式哈希表]"(带[]的可选)
        ///           其中[样式哈希表]的为：key/value的对应关系,如Hashtable_style.Add("Font-size","12pt");
        /// </summary>
        public void SetMultiLayerHeader(DataGrid m_grid,
            System.Web.UI.WebControls.DataGridItemEventArgs e,
            ArrayList m_headers)
        {
            e.Item.Visible = false;

            //处理特殊情况
            if (m_grid.Controls.Count <= 0)
            {
                return;
            }

            Table m_tb  = (Table)m_grid.Controls[0];
            int m_iTmp  = 0;

            处理多行表头的实体#region 处理多行表头的实体
            foreach (object obj in m_headers)
            {
                DataGridItem m_dg     = new DataGridItem(0,0,ListItemType.Header);
                ArrayList m_arrHeader = (ArrayList)obj;

                TableCell[] m_cells = new TableCell[m_arrHeader.Count];
                for (int i=0; i< m_cells.Length; i++)
                {
                    m_cells[i]      = new TableCell();
                    object[] m_arr  = (object[])m_arrHeader[i];
                    m_cells[i].Text = m_arr.GetValue(0).ToString(); //赋header文字

                    if (m_arr.Length > 1) //如果有行列属性
                    {
                        if (m_arr.GetValue(1).ToString().ToLower() == "rowspan")//如果有rowspan属性
                        {
                            m_cells[i].RowSpan = Convert.ToInt32(m_arr.GetValue(2));
                        }
                        else if (m_arr.GetValue(1).ToString().ToLower() == "colspan")//如果有colspan属性
                        {
                            m_cells[i].ColumnSpan = Convert.ToInt32(m_arr.GetValue(2));
                        }

                        //处理单元格的样式
                        if (m_arr.Length >= 4)
                        {
                            if (m_arr.GetValue(3) != null)
                            {
                                Hashtable m_hsStyles = (Hashtable)m_arr.GetValue(3);
                            
                                if (m_hsStyles.Count > 0)
                                {
                                    System.Collections.IDictionaryEnumerator m_style = m_hsStyles.GetEnumerator();
                                    for (int j = 0; j < m_hsStyles.Count; j++)
                                    {
                                        m_style.MoveNext();
                                        m_cells[i].Style.Add(m_style.Key.ToString(),m_style.Value.ToString());
                                    }
                                }
                            }
                        }//if (m_arr.Length > 4) 结束
                    }//if (m_arr.Length > 1) //如果有行列属性 结束
                }// for (int i=0; i< m_cells.Length; i++) 结束

                //将cell加入DataGridItem
                foreach (TableCell c in m_cells)
                {
                    m_dg.Cells.Add(c);
                }

                //将DataGridItem加入DataGrid
                if (m_grid.AllowPaging == true || m_grid.AllowCustomPaging == true)//如果有分页
                {
                    m_tb.Rows.AddAt(m_iTmp + 1,m_dg);
                }
                else //如果没有分页(处理导出excel时）
                {
                    m_tb.Rows.AddAt(m_iTmp,m_dg);
                }

                m_iTmp++;
            }//foreach (object obj in m_headers) 结束
            #endregion 处理多行表头的实体
        }

使用方法：

ArrayList m_headers = new ArrayList();
            ArrayList m_arrHeader1 = new ArrayList();
            m_arrHeader1.Add(new object[]{"事业部","rowspan","2"});
            m_arrHeader1.Add(new object[]{"办事处","rowspan","2"});
            m_arrHeader1.Add(new object[]{"每月合同培训完成名额数","colspan","12"});
            m_arrHeader1.Add(new object[]{"合计","rowspan","2"});
            m_arrHeader1.Add(new object[]{"积压<br>名额数","rowspan","2"});

            ArrayList m_arrHeader2 = new ArrayList();
            for (int i=0; i<12; i++)
            {
                m_arrHeader2.Add(new object[]{(i+1).ToString() + "月"});
            }

            m_headers.Add(m_arrHeader1);
            m_headers.Add(m_arrHeader2);

            this.m_BLL.SetMultiLayerHeader(this.dgrSalesList,e,m_headers);