//声明一个集合变量List<Section> list = new List<Section>();//SQL语句string sql = string.Format("select Groups from Section");//使用DataReader读取到数据库的信息SqlDataReader reader = DBHelper.GetDataReader(sql);while (reader.Read()){//实例化类Section section = new Section();//用类中的字段去接收读取到的信息并储存section.Groups = reader["Groups"].ToString();//往list中添加对象list.Add(section);}reader.Close();