Question

I’ve an Asp.net MVC website, in which I’m using entity framework in my data store to access the database(with POCO entities).

I don’t why but sometimes, it’s looks like the lazy loading is just not done:

example of code not working:

using(BusinessEntities context = new BusinessEntities()){
   User user = context.Users.First(u=>u.Id == parameterId);
   foreach(Post post in user.Posts){//user.Posts is null here and thrown an exception
      //.. doing some things
   }
}

But if I do this, it perfeclty works

using(BusinessEntities context = new BusinessEntities()){
   User user = context.Users.Include("Posts").First(u=>u.Id == parameterId);
   foreach(Post post in user.Posts){//user.Posts is null here and thrown an exception
      //.. doing some things
   }
}

But I don’t understand why the lazy loading doesn’t work:

• Context isn’t disposed
• It’s not a project anonym object or something like that
• I know there is a lot of places in my code where I didn’t have to indicate this .Include and doing relative works
• I’ve the Lazy Loading Enabled set to True on my edmx model

What could leads to this behavior?

Answer 1

Declare Posts property as virtual so that proxy entity created by EF can lazy load the propety.