使用Include和AsNoTracking时查询中的N + 1选择

Question

I have next relation (just example) User 0/1 - * Story I make next query when want to get list of stories with included users .

context.Stories.Include(s => s.User).AsNoTracking().ToList()

I noticed that ef makes additional requests to db for getting users (but this shouldn't be since I use include). All works fine without AsNoTracking().

Looks that issue with nullable relations since relations that dont allow null works fine.

Does anyone have similar issues? Probably it is expected behaviour in case of "allow null" relation.

Answer 1

You can explicitly turn off Lazy Loading as below:

db.Configuration.LazyLoadingEnabled = false;
db.Configuration.ProxyCreationEnabled = false;            

EF will then not lazily load any further entities. You should check if you aren't inadvertently lazily loading some other linked entities.