var query = from t0 in context.ExpressSendMaster

 join t1 in context.Supplier on t0.SupplierCode equals t1.SupplierCode

 join t2 in context.ExpressSendPackageRule on t0.AreaId equals t2.Id into t0_join

 from t0_t2 in t0_join.DefaultIfEmpty()

 where t0.Id == MasterId

 select new ExpressPackageOffLineModel

 {

 PackWeight = t0.Weight,

 SupplierCode = t1.SupplierCode,

 SupplierName = t1.Name,

 SendDate = t0.SendDate,

 OneselfNumber = t0.OneselfNumber,

 Memo = t0.Memo,

 GroupCheck = t0.AreaCode,

 GroupName = t0_t2.NumberType == null ? "" : t0_t2.NumberType,

 GroupId = t0_t2.Id == null ?  : t0_t2.Id,

 LimitWeight = t0_t2.LimitWeight == null ?  : t0_t2.LimitWeight

 };

 if (query.Count() <= )

 {

 model.HasError = true;

 model.ErrorMessage = "错误提示";

 return false;

 }

 model.PackWeight = query.First().PackWeight;

 model.SupplierCode = query.First().SupplierCode;

 model.SupplierName = query.First().SupplierName;

 model.SendDate = query.First().SendDate;

 model.OneselfNumber = query.First().OneselfNumber;

 model.GroupName = query.First().GroupName;

 model.Memo = query.First().Memo;

 model.GroupCheck = query.First().GroupCheck;

 model.GroupId = query.First().GroupId;

 model.LimitWeight = query.First().LimitWeight;