c# – 如何测试DateTime是否在星期二之间(DayOfWeek)

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在C#中,给出一组任意的DayOfWeek终点(如DayOfWeek.Friday和DayOfWeek.Sunday),如果一个任意日期是在两天之间,包含在内的怎么样呢?

例:

  1. // result == true; Oct 23,2010 is a Saturday
  2. var result = InBetweenDaysInclusive(new DateTime(2010,10,23),DayOfWeek.Friday,DayOfWeek.Sunday);
  3.  
  4. // result == true; Oct 22,2010 is a Friday
  5. result = InBetweenDaysInclusive(new DateTime(2010,22),DayOfWeek.Sunday);
  6.  
  7. // result == true; Oct 24,2010 is a Sunday
  8. result = InBetweenDaysInclusive(new DateTime(2010,24),DayOfWeek.Sunday);
  9.  
  10. // result == false; Oct 25,2010 is a Monday
  11. result = InBetweenDaysInclusive(new DateTime(2010,25),DayOfWeek.Sunday);

谢谢!

解决方法

根据开始和结束日期之间的差异是负数还是正/零,此函数将需要两个独立的分支.

我可以完全脱离基地,但我认为这适用于所有情况:

  1. // No state in method,so made it static
  2. public static bool InBetweenDaysInclusive(DateTime date,DayOfWeek start,DayOfWeek end)
  3. {
  4. DayOfWeek curDay = date.DayOfWeek;
  5.  
  6. if (start <= end)
  7. {
  8. // Test one range: start to end
  9. return (start <= curDay && curDay <= end);
  10. }
  11. else
  12. {
  13. // Test two ranges: start to 6,0 to end
  14. return (start <= curDay || curDay <= end);
  15. }
  16. }

作为参考,当我运行它时,您的测试数据返回以下内容,并为每个结果添加了Console.WriteLine:

  1. True
  2. True
  3. True
  4. False

编辑:我最后的解释太模糊了.这是一个固定的.

诀窍在于,开始,那么你有两个有效的范围:开始上限和下限结束.这将导致(开始< = curDay&& curDay< = upperBound)|| curDay< = end&&& lowerBound< = curDay) 然而,由于它们是边界,所以curDay总是< = upperBound和> = lowerBound,因此我们省略了该代码.

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