lazy-loading

i was trying to write a full detailed answer to the following question: Why does "Dispose" work, and not "using(var db = new DataContext())"? so I set up my project that include: Departments and employees using entity framework so my action method was this: public ActionResult Index() { IEnumerable<department> d; using (var ctx = new ApplicationDbContext()) { d = ctx.departments; } return View(d); } it is natural to expect that this will result in the common error : The operation cannot be completed because the DbContext has been disposed and when i wanted to resolve it I did the following [to

In the function below, after the context.SaveChanges(), the entity PropertyType is always null. I just converted from using ObjectContext to DBContext (with database first) and before the change, it worked fine and now it doesn't. Is there something I'm missing? I check the PropertyTypeID and it is written correctly and exists in the db. All relationships are correctly setup in the db and edmx file. The generated .tt files show the PropertyType object as virtual. This is EF 5. Here is the code (non-important assignments of entity properties has been removed): private ListingTransferDetail

I am lazy loading the collections, and also because there are so many fields within the person table, I am writing a projection function to retrieve only certain properties. It works with properties, just not collections of other entities. I would be fine if they were loaded in as proxies and i could get them later, but right now it just loads in null. public IList<Person> ListTop40() { var list = _session.CreateCriteria(typeof(Person)) .SetProjection(Projections.ProjectionList() .Add(Projections.Property("FirstName")) .Add(Projections.Property("LastName")) .Add(Projections.Property("Jersey"))

I am using Automapper to map between Entity and ViewModel object (in both directions). The model uses EF4 DbContext POCOs and needs LazyLoading (and therefore Proxy Generation) enabled. I have come across a problem attempting to update an existing entity from a viewmodel. When I call Mapper.Map(vm, entity), Automapper throws an exception. My question is: how are you supposed to work with EF Proxy objects using Automapper? The code looks (simplified) like this: public class MyEntity { public int Id {get;set;} public int Name {get;set;} } public class ViewModel { public int Id {get;set;} public

I'm using NHibernate 3.0.0 and the new feature lazy properties. However, in some queries I want to eagerly load the properties and I would like the query to result in non-proxied entity instances. I also prefer to use the LINQ provider or QueryOver. So my two questions related to this are: I know that eager loading of properties can be achieved in HQL with "fetch all properties" but is it possible to do the same with the LINQ provider or QueryOver? If I execute an HQL query with "fetch all properties" the entities in the result are indeed eagerly loaded but they are still proxied. Is there a