在asp.net中怎么样计算两个日期相差的年、月份、日期、小时、分钟、妙等 ...

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//                 调用
//                 DateTime   a=Convert.ToDateTime("2005-09-03   20:15");
//                 DateTime   b=Convert.ToDateTime("2005-09-04   09:09   ");
//                 double   d=Bll.Common.DateDiff(Bll.Common.EnumDateCompare.day,a,b);
//                 Response.Write(d.ToString("f0"));//四舍五入
public   enum   EnumDateCompare
{
                          year         =1,
                          month         =2,
                          day                 =3,
                          hour         =4,
                          minute         =5,
                          second         =6
}
public   static   double   DateDiff(EnumDateCompare   howtocompare,   System.DateTime   startDate,   System.DateTime   endDate)
{
                          double   diff=0;
                          System.TimeSpan   TS   =   new   System.TimeSpan(endDate.Ticks-startDate.Ticks);

                          switch   (howtocompare)
                          {
                                  case   EnumDateCompare.year:
                                          diff   =   Convert.ToDouble(TS.TotalDays/365);
                                          break;
                                  case   EnumDateCompare.month:
                                          diff   =   Convert.ToDouble((TS.TotalDays/365)*12);
                                          break;
                                  case   EnumDateCompare.day:
                                          diff   =   Convert.ToDouble(TS.TotalDays);
                                          break;
                                  case   EnumDateCompare.hour:
                                          diff   =   Convert.ToDouble(TS.TotalHours);
                                          break;
                                  case   EnumDateCompare.minute:
                                          diff   =   Convert.ToDouble(TS.TotalMinutes);
                                          break;
                                  case   EnumDateCompare.second:
                                          diff   =   Convert.ToDouble(TS.TotalSeconds);
                                          break;
                          }
                          return   diff;
}