Question

I’m using EF 4 with POCO and lazy loading and proxy creation disabled (due to serialization requirements). I have two tables that have a many to many relationship using a third cross-reference table. In EF, the cross-reference entity does not exist and I have one to many navigation properties on both sides of the entity relationships (as expected).

However, when I use the naviation property of one of the entities that I have confirmed via SQL Manager queries to have data, I get an empty result set.

Has anyone else run into this? If so, any advice on how to resolve would be most appreciated.

Thanks!

Answer 1

You need to use LoadProperty or Include method.

           Order order = EFContext.Orders.Include("Lines")
                         .Where(m => m.OrderID == orderId).First();

More from [MSDN]
“Because POCO entities do not have the same relationship requirements as objects that inherit from EntityObject, a slightly different process is required to load related objects”