Entity Framework Core 5 关闭加载 NavigationProperties

Question

How can I turn off loading navigation properties in EF Core 5 when I get data from the DBContext ?

I tried to add:

public DataContext(DbContextOptions<DataContext> options)
        : base(options)
{
   this.ChangeTracker.LazyLoadingEnabled = false;
}

but navigation properties are still loaded.

Loaded NavProp

Edit : I added to AddDBContext option

UseQueryTrackingBehavior(QueryTrackingBehavior.NoTracking);

and it looks like this works.

Hope it doesn't spoil anything else?

Edit-2 UseQueryTrackingBehavior(QueryTrackingBehavior.NoTracking); - ok its not what I need....

I getting data like:

List<Data> dataList = await _dataContext.Data.Where(w => idMeters.Contains(w.IdMeter.Value)).ToListAsync();

In result I have Data object with IdMeterNavigation, and IdMeterNavigation have another NavigationProperties... I don't want to load any NavigationProperties how I can do that?

I even removed virtual from class fields and they are still loaded.

Answer 1

Default behaviour of EF is to not load related entities. In order to load related entities you could use:

• eager loading
• explicit loading
• select loading
• lazy loading

So, for me it seems that you have ENABLED lazy loading or you actually do a SELECT loading using "Select" LINQ extension or kind of automapper software.

Check if you havent enabled lazy loading for sure... https://docs.microsoft.com/en-us/ef/core/querying/related-data/lazy