根据Date精确查询数据返回不为null值

曾经做项目遇到这样一个问题，再商品的进销存分析中，有进货数，销售数，库存数，在当天中它没有进行、销售但是库存数一直是不变的；如下图：

 

一开始写时间判断时，他这个时间范围内应该没有一条数据的，返回应该为0条数据，差不多就是将表格数据清空的情况，仔细想了想我就将数据的条数进行判断，若是数据大于一条，就返回本身值，若是为0，我就将把上个查询重新复制过来，进货数、销售数赋值为0，库存数保留。

代码如下：

 public ActionResult SelectJinXiaoCun(BsgridPage bsgridPage, string start, string end)
        {                                                         //两个时间参数start,end;
            var list = (from tbXSMX in myModels.Base_XiaoShoMX
                        join tbXS in myModels.Base_XiaoShouDan on tbXSMX.XiaoShouDanID equals tbXS.XiaoShouDanID
                        join tbKuCun in myModels.JC_KuCun on tbXSMX.KuCunID equals tbKuCun.KuCunID
                        from tbJinHuoMX in myModels.Base_JinHuoMX
                        where tbJinHuoMX.KuCunID == tbXSMX.KuCunID
                        select new JinHuoVo
                        {
                            XiaoShoMXID = tbXSMX.XiaoShoMXID,
                            XiaoShouDate = tbXS.XiaoShouDate,
                            XiaoJi = tbXSMX.XiaoJi,
                            KuCunNumber = tbKuCun.KuCunNumber,
                            ShuLiang = tbJinHuoMX.ShuLiang,
                            XiaoShouNumber = tbXSMX.XiaoShouNumber 
                        }).ToList();
            if (!string.IsNullOrEmpty(start) && !string.IsNullOrEmpty(end)) //进行时间条件筛选数据
            {
                DateTime Start = Convert.ToDateTime(start);
                DateTime End = Convert.ToDateTime(end);
                list = list.Where(m => m.XiaoShouDate >= Start && m.XiaoShouDate <= End).ToList();
            }
            var lists = (from tb in list
                         group tb by tb.XiaoJi into JX
                         select new JinHuoVo
                         {
                             XiaoJi = JX.OrderByDescending(m => m.XiaoShoMXID).FirstOrDefault().XiaoJi,
                             KuCunNumber = JX.Sum(m => m.KuCunNumber),
                             ShuLiang = JX.Sum(m => m.ShuLiang),
                             XiaoShouNumber = JX.Sum(m => m.XiaoShouNumber)
                         }).ToList();//数据进行分组;
            int count = lists.Count();
            if (count = 0)//数据条数判断，为空就自行参数赋值
            {
                List<JinHuoVo> listJX = lists.Skip(bsgridPage.GetStartIndex()).Take(bsgridPage.pageSize).ToList();
                Bsgrid<JinHuoVo> bsgrid = new Bsgrid<JinHuoVo>()
                {
                    success = true,
                    curPage = bsgridPage.curPage,
                    totalRows = count,
                    data = listJX
                };
                return Json(bsgrid, JsonRequestBehavior.AllowGet);
            }
            else
            {
                var listKC = (from tbXSMX in myModels.Base_XiaoShoMX
                              join tbXS in myModels.Base_XiaoShouDan on tbXSMX.XiaoShouDanID equals tbXS.XiaoShouDanID
                              join tbKuCun in myModels.JC_KuCun on tbXSMX.KuCunID equals tbKuCun.KuCunID
                              from tbJinHuoMX in myModels.Base_JinHuoMX
                              where tbJinHuoMX.KuCunID == tbXSMX.KuCunID
                              select new JinHuoVo
                              {
                                  XiaoShoMXID = tbXSMX.XiaoShoMXID,
                                  XiaoJi = tbXSMX.XiaoJi,
                                  KuCunNumber = tbKuCun.KuCunNumber, //库存数保留
                                  ShuLiang = 0, //进货数、销售数都赋值为0；
                                  XiaoShouNumber = 0
                              }).ToList();
                var listss = (from tb in listKC
                              group tb by tb.XiaoJi into JX
                              select new JinHuoVo
                              {
                                  XiaoJi = JX.OrderByDescending(m => m.XiaoShoMXID).FirstOrDefault().XiaoJi,
                                  KuCunNumber = JX.Sum(m => m.KuCunNumber),
                                  ShuLiang = JX.Sum(m => m.ShuLiang),
                                  XiaoShouNumber = JX.Sum(m => m.XiaoShouNumber)
                              }).ToList();
                int KCcount = listss.Count();
                List<JinHuoVo> listJXs = listss.Skip(bsgridPage.GetStartIndex()).Take(bsgridPage.pageSize).ToList();
                Bsgrid<JinHuoVo> bsgrid = new Bsgrid<JinHuoVo>()
                {
                    success = true,
                    curPage = bsgridPage.curPage,
                    totalRows = KCcount,
                    data = listJXs
                };
                return Json(bsgrid, JsonRequestBehavior.AllowGet);
               }
        }//小计