3.1.0.9

解决了：过滤更新列时，下面这种写法会报错

  db.DisableUpdateColumns= new string[] {"get"}; //不更新 get列
  db.update(student);

public Student class{     '
            public int name{ get; set; }

            private   Student _get;
            public virtual Student get
            {
                get {
                    if (_get==null)
                        _get = DBManager.xxxx(classId);
                    return _get;
                }
            }
}