DeleteObject method is missing in Entity Framework 4.1

问题

This is driving me crazy. I am getting error that

object doesn't contain definition for DeleteObject.

Here is my line of code that produces an error:

ctx.Tanks.DeleteObject(Tank);

I tried to reference another object from another edmx file that my friend has created and then everything is fine, DeleteObject exists. I don't think I miss any references in my project.

And project itself contains edmx file and I used DBContext to create POCOs.

Any ideas?

回答1:

The DbContext API defines DbSets not ObjectSets. DbSet has a Remove method not DeleteObject method. You need to first decide which API you are going to use. If it the ObjectContext or DbContext.

回答2:

  [HttpPost]
        public ActionResult Delete(IEnumerable<int> employeeIdsToDelete)
        {
            var lstemployee = _db.StudentEmployees.Where(x => employeeIdsToDelete.Contains(x.Id));
            foreach (var item in lstemployee)
            {
                _db.StudentEmployees.Remove(item);
            }
            _db.SaveChanges();

            return RedirectToAction("Index");
        }

来源：https://stackoverflow.com/questions/9267991/deleteobject-method-is-missing-in-entity-framework-4-1