sqlsugar 统计总数超级方便写法

        list = list.GroupBy(f => f.ShipmentNum).Select(f =>
        {
            var o = f.FirstOrDefault();

            var number = f.Sum(f1 => f1.Number);
            o.Number = number;

            var weight = f.Sum(x => x.Weight);
            o.Weight = weight;

            var meterweight = f.Sum(x => x.MeterWeight);
            o.MeterWeight = meterweight;

            o.DeclareTotalPrice = o.DeclarePrice * number;  // 申报总价

            return o;

        }).ToList();

        return list;