//存货编码不以x开头的则是非修磨刀具
                    var q = from s in db.Inventory.Where(s => s.cInvCCode.StartsWith("9"))
                            where !s.cInvCode.ToUpper().StartsWith("X")//此句很关键,采用StringComparison.OrdinalIgnoreCase功能去忽略大小写会报错
                            select new { 存货编码 = s.cInvCode, 存货名称 = s.cInvName, 规格型号 = s.cInvStd, 建档日期 = s.dSDate };


                 


                    //查找重复项
                    var q1 = from s in db.Inventory.Where(s => s.cInvCCode.StartsWith("9"))
                             where !s.cInvCode.ToUpper().StartsWith("X")
                             group s by  s.cInvStd  into g
                             where g.Count() > 1
                             
                             select new { 规格型号 = g.Key, 重复个数 = g.Count() };

                    var qz = from s1 in q
                             join s2 in q1 on s1.规格型号 equals s2.规格型号
                             orderby  s1.规格型号 , s1.建档日期 descending
                             select new { s1.存货编码, s1.存货名称, s1.规格型号, s2.重复个数,s1.建档日期 };

                    dataGridView1.DataSource = qz.ToList();
                    dataGridView1.AutoResizeColumns();