C#匿名对象在其它方法体内怎么取到相应的值（不想建立对应的类并转化的情况下）？

public object AnonymousObj()
{
   return new { UserId = "1000", Message = "OK", Data = new {...} }
}

 public void Other()
 {
    var obj = AnonymousObj();
    string data = obj.GetType().GetProperty("Data").GetValue(obj).ToString();

 }