修改DataGrid表頭

DataGrid在ItemDataBound之前我們可以通過DataGrid的ItemCreated事件對表頭進行修改。以達到顯示多層信息的效果

效果圖請查看附件;表頭總共有三行上面兩行是新添加進去的

例如：

private void dglist_ItemCreated(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
        {
            try
            {
                ListItemType lit = e.Item.ItemType;
                if (ListItemType.Header == lit)
                {
                    e.Item.SetRenderMethodDelegate(new RenderMethod(NewRenderMethod));
                }
            }
            catch (Exception ex)
            {
                this.ExecJavaScript("alert('" + ex.Message + "');");
            }
        }

 private void NewRenderMethod(HtmlTextWriter writer, Control ctl)
        {
            try
            {
                TableCell cell;
                for (int i = 0; i < 9; i++)
                {
                    cell = (TableCell)ctl.Controls[i];
                    cell.Attributes.Add("rowspan", "3");
                    cell.RenderControl(writer);
                }
                writer.Write("<td colspan=\"5\" align=\"center\">申請人信息</td>");
                writer.Write("<td colspan=\"4\" align=\"center\">使用人信息</td>");
                cell = (TableCell)ctl.Controls[18];
                cell.Attributes.Add("rowspan", "3");
                cell.RenderControl(writer);
                writer.Write("<td colspan=\"6\" align=\"center\">經辦人信息</td>");
                writer.Write("</tr>\n");
                this.dglist.HeaderStyle.AddAttributesToRender(writer);
                writer.RenderBeginTag("tr");
                for (int i = 9; i < 14; i++)
                {
                    cell = (TableCell)ctl.Controls[i];
                    cell.Attributes.Add("rowspan", "2");
                    cell.RenderControl(writer);
                }
                writer.Write("<td colspan=\"2\" align=\"center\">集團員工</td>");
                writer.Write("<td colspan=\"2\" align=\"center\">非集團員工</td>");
                for (int i = 19; i < 25; i++)
                {
                    cell = (TableCell)ctl.Controls[i];
                    cell.Attributes.Add("rowspan", "2");
                    cell.RenderControl(writer);
                }
                writer.Write("</tr>\n");
                this.dglist.HeaderStyle.AddAttributesToRender(writer);
                writer.RenderBeginTag("tr");
                for (int i = 14; i < 18; i++)
                {
                    cell = (TableCell)ctl.Controls[i];
                    cell.RenderControl(writer);
                }
                writer.Write("</tr>\n");
            }
            catch
            {
            }
        }