//在数据库里存在的内容上进行修改 public void Update(Order order) { using (var db = new OrderDB()) { db.Order.Attach(order); db.Entry(order).State = EntityState.Modified; order.OrderDetails.ForEach( detail => db.Entry(detail).State = EntityState.Modified); db.SaveChanges(); } }
public void Add(Order order) { using (var db = new OrderDB()) { db.Order.Add(order); //db.Order.Attach(order); db.Entry(order).State = EntityState.Added; db.SaveChanges(); } }
public void UpdateOr(Order order) { using (var db = new OrderDB()) { db.OrderDetail.RemoveRange(order.OrderDetails); db.Order.Remove(order); db.Order.Add(order); db.Entry(order).State = EntityState.Added; db.SaveChanges(); } }