将SQL转换为LINQ的问题

Question

我在SQL Management Studio中编写的以下查询，它工作正常

select distinct location.LocationId, location.Name, location.WorkArea,
            crop.CropId, HubCropTypes.Name, crop.recommendedDate, activity.ApplicationDate, activity.Type, crop.IsDeleted cropDeleted, activity.IsDeleted activityDeleted
from location 
    left outer join crop on location.LocationId = crop.LocationId
    left outer join activity on crop.CropId = Activity.CropID
    left outer join HubCropTypes on crop.HubCropTypeID = HubCropTypes.HubCropTypeID
where location.FarmId = 'xxxxxxxxx'
and location.IsDeleted = 0
order by location.LocationId,crop.recommendedDate, location.Name

然而，LINQ版本没有，并且在SQL中玩了之后我发现它是左边的连接。我以为DefaultIfEmpty替换了LINQ中的左连接？

 var query = (from l in _db.Locations
                             join c in _db.Crops.DefaultIfEmpty() on l.LocationId equals c.LocationId
                             join a in _db.Activities.DefaultIfEmpty() on c.CropId equals a.CropID
                             join h in _db.HubCropTypes.DefaultIfEmpty() on c.HubCropTypeID equals h.HubCropTypeID
                             where l.FarmId == FarmID
                             where l.IsDeleted == false
                             select new
                             {
                                 LocationID = l.LocationId,
                                 LocationName = l.Name,
                                 WorkArea = l.WorkArea,
                                 CropID = c.CropId,
                                 CropName = h.Name,
                                 CropRecommendedDate = c.RecommendedDate,
                                 ActivityApplicationDate = a.ApplicationDate,
                                 ActivityType = a.Type,
                                 isCropDeleted = c.IsDeleted,
                                 isActivityDeleted = a.IsDeleted
                             }).Distinct();