由于要处理24小时基于时间和你有一个逗号分隔秒部分，我建议您指定自定义格式为：

Since you are handling 24-hour based time and you have a comma separating the seconds fraction, I recommend that you specify a custom format:

DateTime myDate = DateTime.ParseExact("2009-05-08 14:40:52,531", "yyyy-MM-dd HH:mm:ss,fff",
                                       System.Globalization.CultureInfo.InvariantCulture)