C# foreach循环、Linq循环之后增加汇总行

private void BMbyBindData()
        {
            DateTime time1 = DateTime.Parse(DateTime.Now.ToShortDateString() + " 23:59:59");
            DateTime time2 = DateTime.Parse(DateTime.Now.ToShortDateString() + " 00:00:00");

            var Datainfo = (from name in new ReportTwo().BuMenWeek(time1, time2).AsEnumerable()
                            select new SumColumnModel
                            {
                                rows =(name[0]).ToString(),
                                BusinessUnitIdName = name[1].ToString(),
                                SystemUserIdName = name[2].ToString(),
                                zhoujifen = Convert.ToInt32(name[3]),
                                zong = Convert.ToInt32(name[4]),
                            }).ToList();

            SumColumnModel zm = new SumColumnModel();//实例化类

            zm.rows = "";   //增加汇总行的序号
            zm.BusinessUnitIdName = "合计";
            int a = Datainfo.Select(x => x.zong).Sum();     //得到各小组回执总和
            double d = Convert.ToDouble(a) / 99999;
            zm.SystemUserIdName = string.Format("{0:0.00%}", d);   //得到完成率
            zm.zhoujifen = Datainfo.Select(x => x.zhoujifen).Sum();     //周积分总和
            zm.zong = Datainfo.Select(x => x.zong).Sum();           //各小组回执总和

            List<SumColumnModel> zmlist = new List<SumColumnModel>();
            Datainfo.Add(zm);

            CR.DataSource = Datainfo;
            CR.Height = CR.Rows.Count * CR.RowTemplate.Height + CR.ColumnHeadersHeight;

            CR.ReadOnly = true;

            CR.Columns["rows"].HeaderText = "排名";
            CR.Columns["rows"].Width = 150;
            CR.Columns["BusinessUnitIdName"].HeaderText = "组别";
            CR.Columns["BusinessUnitIdName"].Width = 250;
            CR.Columns["SystemUserIdName"].HeaderText = "完成率（回执总量/本组任务量）";
            CR.Columns["SystemUserIdName"].Width = 300;
            CR.Columns["zhoujifen"].HeaderText = "本周积分量";
            CR.Columns["zhoujifen"].Width = 200;
            CR.Columns["zong"].HeaderText = "总回执量";
            CR.Columns["zong"].Width = CR.Width - 850;
        }

public static void ZuZhou()
        {   
            StringBuilder messb = new StringBuilder();
            if (mrzuznow != null)
            {
                messb.Append(@"<table width=""100%"">");
                messb.Append("<tr>");
                messb.Append(@"<td colspan=""4"">");
                messb.Append("【本周小组排名】：");
                messb.Append("</td>");
                messb.Append("</tr>");
                messb.Append("<tr>");
                messb.Append("<td>");
                messb.Append("排名 ");
                messb.Append("</td>");
                messb.Append("<td>");
                messb.Append(" 组别");
                messb.Append("</td>");
                messb.Append("<td>");
                messb.Append("回执总量 ");
                messb.Append("</td>");
                messb.Append("<td>");
                messb.Append("完成率 ");
                messb.Append("</td>");
                messb.Append("<td>");
                messb.Append("本周回执量 ");
                messb.Append("</td>");
                messb.Append("</tr>");

                foreach (DataRow item in mrzuznow.Tables[0].Rows)
                {
                    messb.Append("<tr>");
                    messb.Append("<td>");
                    messb.Append("TOP:【" + item["rows"].ToString() + "】");
                    messb.Append("</td>");
                    messb.Append(@"<td>" + item["BusinessUnitIdName"].ToString() + "");
                    messb.Append("</td>");
                    messb.Append(@"<td>" + item["zong"].ToString() + "");
                    double i = Math.Round(Convert.ToDouble(item["bv"]), 2);
                    string ii = (i * 100).ToString() + "%";
                    messb.Append("<td >" + ii + "");
                    messb.Append("</td>");
                    messb.Append(@"<td>" + item["zhoujifen"].ToString() + "");
                    messb.Append("</td>");
                    messb.Append("</tr>");

                }

                int rows = mrzuznow.Tables[0].Rows.Count + 1;

                int sumzhoujifen = 0;
                foreach (DataRow item in mrzuznow.Tables[0].Rows)
                {
                    sumzhoujifen +=Convert.ToInt32( item["zhoujifen"]);
                }
                int Sumzong = 0;
                foreach (DataRow item in mrzuznow.Tables[0].Rows)
                {
                    Sumzong += Convert.ToInt32(item["zong"]);
                }
                

                double d = Convert.ToDouble(Sumzong) / 38291;
                string SumSystemUserIdName = string.Format("{0:0.00%}", d);   //得到完成率

                messb.Append("<tr>");
                messb.Append("<td>");
                messb.Append("");
                messb.Append("</td>");
                messb.Append("<td>");
                messb.Append(" 合计");
                messb.Append("</td>");
                messb.Append("<td>");
                messb.Append("" + Sumzong + "");
                messb.Append("</td>");
                messb.Append("<td>");
                messb.Append("" + SumSystemUserIdName + " ");
                messb.Append("</td>");
                messb.Append("<td>");
                messb.Append(""+sumzhoujifen+"");
                messb.Append("</td>");
                messb.Append("</tr>");
                messb.Append("</table>");
			}
		}