Question

I know to update an object in EF I can do something like…

var hotel = context.Hotels.SingleOrDefault(u => u.HotelID == editedHotel.HotelID);
    hotel.Name= editedHotel.Name;
    hotel.Address = editedHotel.Address;
    hotel.RoomCount = editedHotel.RoomCount;
context.SaveChanges();

but this gets quite long if a lot of fields need updating.

Is there a way I can do something like…

    var hotel = context.Hotels.SingleOrDefault(u => u.HotelID == editedHotel.HotelID);
hotel = editedHotel;
context.SaveChanges();

…so all of the fields can be changed in one go?

Answer 1

How about…

var cachedHotel = context.Hotels.Local
    .FirstOrDefault(h => h.id = editedHotel.id);
if (cachedHotel != null)
{
  context.Hotels.Detach(cachedHotel);
}
context.Hotels.Attach(editedHotel);
context.Entry(editedHotel).State = System.Data.EntityState.Modified;
context.SaveChanges();