这是我想要做的:给定日期、星期几和整数n
,判断日期是否是该月的第n
天.
Here is what I am trying to do:
Given a date, a day of the week, and an integer n
, determine whether the date is the n
th day of the month.
例如:
1/1/2009,Monday,2
的输入将是错误的,因为 1/1/2009
不是第二个星期一
input of 1/1/2009,Monday,2
would be false because 1/1/2009
is not the second Monday
输入2008 年 11 月 13 日,星期四,2
将返回 true,因为这是第二个星期四
input of
11/13/2008,Thursday,2
would return true because it is the second Thursday
如何改进这个实现?
private bool NthDayOfMonth(DateTime date, DayOfWeek dow, int n)
{
int d = date.Day;
return date.DayOfWeek == dow && (d/ 7 == n || (d/ 7 == (n - 1) && d % 7 > 0));
}
你可以改变一周的检查,这样函数就会变成:
You could change the check of the week so the function would read:
private bool NthDayOfMonth(DateTime date, DayOfWeek dow, int n){
int d = date.Day;
return date.DayOfWeek == dow && (d-1)/7 == (n-1);
}
除此之外,它看起来还不错且高效.
Other than that, it looks pretty good and efficient.
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