public List<T> getInstanceFromMemory<T>() where T : class
        {
            List<T> listFromMemory;

            using (dbReal db = new dbReal())
            {
                listFromMemory = (from anInstance in db.Set<T>()
                                          select anInstance).ToList();
            }

            return listFromMemory;
        }

public class MapObject :iDB
    {
         Guid _id;

        [Key]
        public Guid id
        {
            get { return _id; }
            set { _id = value; }
        }

        public MapObject()
        {
            id = Guid.NewGuid();
        }

    

        mapObjectTypes _typeOfObject;

        public mapObjectTypes typeOfObject
        {
            get { return _typeOfObject; }
            set { _typeOfObject = value; }
        }
}

  public void save()
        {
            using (dbReal df = new dbReal())
            {
                MapObject anEntity = df.Set(this.GetType()).Find(this.id) as MapObject;

                if (anEntity == null)
                {
                    df.Set(this.GetType()).Add(this); //Вот тут добавляется запись, нарушающая уникальность PK
                }
                else
                {
                    //  df.Set(this.GetType()).Attach(this);
                    syncro(anEntity);

                }
                df.SaveChanges();
            }
        }