Question

I have an ASP.NET MVC POST action for saving an entity on submit of a form. It works fine for insert but doesn’t work for update, the database doesn’t get called, so it’s clearly not tracking the changes, as it’s “detached”. I’m using Entity Framework w/.NET 4:

//POST: /Developers/Save/
        [AcceptVerbs(HttpVerbs.Post)]
        public ActionResult Save(Developer developer)
        {
            developer.UpdateDate = DateTime.Now;
            if (developer.DeveloperID == 0)
            {//inserting new developer.
                DataContext.DeveloperData.Insert(developer);
            }
            //save changes - TODO: doesn't update...
            DataContext.SaveChanges();
            //redirect to developer list.
            return RedirectToAction("Index");
        }

Any ideas would be greatly appreciated, thanks,

Justin

Answer 1

You’re never applying the new data to the context. You can use the Stub Entity trick to avoid querying.

Try something like this (from memory, sry if there are errors):

public ActionResult Save(Developer developer)
{
     developer.UpdateDate = DateTime.Now;

     Developer d = new Developer { ID = developer.ID };
     DataContext.Attach(d);

     DataContext.ApplyCurrentValues(developer);
     DataContext.SaveChanges();
}