GridView Footer页脚统计实现多行

在使用GridView时有时会需要多行显示页脚Footer的统计，下面是一种解决方法，仅仅供各位参考

在GridView的RowCreated事件中添加多行页脚，实例代码如下：

        protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
        {
            if(e.Row.RowType == GridViewRowType.Footer)
            {
                Tuple<int, int> sum = IndexStatisticsDal.GetRecordSum(Convert.ToDateTime(ViewState["StartDate"]), Convert.ToDateTime(ViewState["EndDate"]), StatisticTypeEnum.REENTRYICU);
                string resultStr = "&frasl;";
                if (sum.Item2 > 0)
                {
                    resultStr = ((double)sum.Item1 / sum.Item2 * 1000).ToString("0.0000") + "‰";
                }
                TableCellCollection footerRow = e.Row.Cells;
                footerRow.Clear();
                footerRow.Add(new TableCell());
                footerRow[0].Text = "合计";
                footerRow[0].Attributes.Add("rowspan", "2");
                footerRow.Add(new TableCell());
                footerRow[1].Text = sum.Item1.ToString();
                footerRow.Add(new TableCell());
                footerRow[2].Text = sum.Item2.ToString() + "</th></tr><tr class="C1FooterRow" style="font-size: 14px; font-weight: bold;">";
                footerRow.Add(new TableCell());
                footerRow[3].Text = "非预期重返重症医学科率";
                footerRow.Add(new TableCell());
                footerRow[4].Text = resultStr;
            }
        }