DateTime DayOfWeek比较

Question

我想比较一个日期，看看它是否在星期六之前是这样的：

        //Check if Saturday YET
        if (MYWorkDay.DayOfWeek < DateTime.DayOfWeek.Saturday)
            IGottaWork();
        else
            Party();

似乎没有办法做到这一点。

有办法吗？

提前致谢

Answer 1

为什么不呢？

    if (MYWorkDay.DayOfWeek != DayOfWeek.Saturday
          && MYWorkDay.DayOfWeek != DayOfWeek.Sunday) 
    {
        IGottaWork();
    }
    else
        Party();

甚至更好：

List<DayOfWeek> partyDays = new List<DayOfWeek> {
    DayOfWeek.Saturday, DayOfWeek.Sunday
};

if (partyDays.Contains(MYWorkDay.DayOfWeek))
    Party();
else
    IGottaWork();

Answer 2

来自MSDN：

  

DayOfWeek枚举中的常量值的范围是   DayOfWeek.Sunday to DayOfWeek.Saturday。如果转换为整数，则为   值的范围从零（表示DayOfWeek.Sunday）到六   （表示DayOfWeek.Saturday）。

因此，您也可以使用大于和小于运算符进行计算。

//Check if Saturday YET
if (MYWorkDay.DayOfWeek < DayOfWeek.Saturday && MYWorkDay.DayOfWeek > DayOfWeek.Sunday)
    IGottaWork();
else
    Party();

Answer 3

DayOfWeek是一个枚举，从星期日开始为0，星期六为最后一个元素，因此整数为6。比较时想一想。

Answer 4

如果您希望进行比较而不是检查列表，您也可以这样做：

if ((MYWorkDay.DayOfWeek.CompareTo(DayOfWeek.Sunday) > 0) && (MYWorkDay.DayOfWeek.CompareTo(DayOfWeek.Saturday) < 0))
{
      IGottaWork();
}
else
{
      Party();
}

Answer 5

试试这个：

if (new [] {DayOfWeek.Saturday, DayOfWeek.Sunday}.Contains(d.DayOfWeek)) {
  // party :D
} else {
  // work  D:
}