C# datatable转list

	 List<DateTime> listDate = result.Select("加油时间 is not null", "加油时间 asc").ToList().ConvertAll<DateTime>(m=> Convert.ToDateTime(m["加油时间"].ToString()));
                        DateTime rowMin = listDate.OrderBy(o => o).FirstOrDefault();
                        DateTime rowMax = listDate.OrderByDescending(o => o).FirstOrDefault();