Entity Framework Include() is not working within complex query

Question

Consider following LINQ query:

var item = (from obj in _db.SampleEntity.Include(s => s.NavProp1)
           select new
           {
                ItemPr         


        

Answer 1

How did you find that item.ItemProp1.NavProp1 is null. EF uses proxies to load all required properties when you try to access it.

What about

var item = (from obj in _db.SampleEntity.Include(s => s.NavProp1)
   select obj).SingleOrDefault();

Assert.IsNotNull(obj.NavProp1);
Assert.IsNotNull(obj.NavProp2);

You can also try with

var item = (from obj in _db.SampleEntity.Include(s => s.NavProp1)
   select new
   {
        ItemProp1 = obj,
        NavProp1 = obj.NavProp1,
        ItemProp2 = obj.NavProp2.Any(n => n.Active)
   }).SingleOrDefault();

Assert.IsNotNull(item.NavProp1)

Of course I assume that you don't have any problems with EF navigation property mappings.