C# 实现动态添加列，新增合计行，求和

   DataTable da = CommonBLL.GetList("*", "sys_dict", "IfState=1 and DictTypeId=14");

            string strField = "CACCNUM as 账号账号,Loannumber as 借据号,BILLDATE as 借款时间,CAName as 借款人姓名,CPOSITION as 质押商品房位置,LoanAmount as 借款总额,";
            for (int i = ; i < da.Rows.Count; i++)
            {
                strField += " case when xqName ='" + da.Rows[i]["DictName"].ToString() + "' then  LoanAmount else  null end as " + da.Rows[i]["DictName"].ToString() + "_借款总额,";
            }
            strField += "Rateval as 年利率,Endratedata as 到期时间,CTEL 借款人固定电话,CMOBILE as 借款人手机号,CSSNUMBER as 身份证号,CADDRESS as 住址,CWORK as 所在单位,Realtor as 售楼员,Proportion as 首付比例,RepayAmountSum as 己还本金合计,";
            for (int i = ; i < da.Rows.Count; i++)
            {
                strField += " case when xqName ='" + da.Rows[i]["DictName"].ToString() + "' then  RepayAmountSum else  null end as " + da.Rows[i]["DictName"].ToString() + "_己还本金合计,";
            }
            strField += "RepayRateSum as 已清利息合计,";
            for (int i = ; i < da.Rows.Count; i++)
            {
                strField += " case when xqName ='" + da.Rows[i]["DictName"].ToString() + "' then  RepayRateSum else  null end as " + da.Rows[i]["DictName"].ToString() + "_已清利息合计,";
            }
            strField += "RepaySum as 本息合计,SurplusSum as 剩余本金合计 ,";
            for (int i = ; i < da.Rows.Count; i++)
            {
                strField += " case when xqName ='" + da.Rows[i]["DictName"].ToString() + "' then  SurplusSum else  null end as " + da.Rows[i]["DictName"].ToString() + "_剩余本金合计,";
            }
            strField += "Repay as 已还清";
            DataTable dt = JZCard.BLL.CommonBLL.GetList(strField, "v_finance_billloan_list", _strWhere);
            decimal JkHj = Commons.ParseDecimalValue(dt.Compute("sum(借款总额)", ""));
            decimal YHBJHJ = Commons.ParseDecimalValue(dt.Compute("sum(己还本金合计)", ""));
            decimal YQLXHJ = Commons.ParseDecimalValue(dt.Compute("sum(已清利息合计)", ""));
            decimal BXHJ = Commons.ParseDecimalValue(dt.Compute("sum(本息合计)", ""));
            decimal SYBXHJ = Commons.ParseDecimalValue(dt.Compute("sum(剩余本金合计)", ""));

            DataRow dr = dt.NewRow();
            dr["账号账号"] = "合计";
            dr["借款总额"] = JkHj;
            dr["己还本金合计"] = YHBJHJ;
            dr["已清利息合计"] = YQLXHJ;
            dr["本息合计"] = BXHJ;
            dr["剩余本金合计"] = SYBXHJ;

            dt.Rows.Add(dr);
            // c#如何设置DataGridView的自动创建列
            this.dg_BillLoanList.AutoGenerateColumns = true;

            this.dg_BillLoanList.DataSource = dt;