为什么实体消失后仍然仍然有效？

TrackableCollection

context.Entities.Add(entity)

TrackableCollection

context.Entities.Remove(entity)

context.SubmitChanges()

    public class Entity
    {
       [Required]
       public string Name { get; set; }
    }

context.Entry(entity).State = EntityState.Detached

context.SaveChanges()