c# - 我如何计算假期？

Question

我有一个应用程序可以在人们生病时进行登记，并在此事件发生后的特定工作日内向经理发送通知。

我可以使用 DateTime 的属性来跳过周末，但如何跳过假期？

我在某处读到教堂假期是从复活节开始计算的。但是怎么办？我如何首先找到复活节？

Answer 1

跳过日期之间的假期和计算复活节是两个不同的野兽，您可能想要前者。

您的应用程序应该维护一个假期列表，正如@GeneMyers 关于 Holidays in United States 的评论所建议的那样

有了这个列表，您可以使用如下代码:

private static void Main(string[] args)
{
    var start  = new DateTime(2015, 01, 01); // Thusday
    var finish = new DateTime(2015, 01, 31); // Saturday

    var totalDays = finish.Subtract(start).TotalDays;  // 30 days
    var test1 = GetWorkingDays(start, finish, false, new List<DateTime>()); // should be 30
    var test2 = GetWorkingDays(start, finish, true , new List<DateTime>()); // should be 21
    var test3 = GetWorkingDays(start, finish, true , new List<DateTime>     // should be 19
    {
        new DateTime(2015, 01, 01), // New Year's Day
        new DateTime(2015, 01, 09), // Random holiday
        new DateTime(2015, 01, 25), // Sao Paulo city foundation, sunday
    });
}

public static int GetWorkingDays(DateTime from, DateTime to, 
                                 bool skipWeekends, IEnumerable<DateTime> holidays)
{
    var totalDays = (int)to.Subtract(from).TotalDays;

    var isHoliday = new Func<DateTime, bool>(date =>
        holidays.Contains(date));
    var isWeekend = new Func<DateTime, bool>(date => 
        date.DayOfWeek == DayOfWeek.Saturday || 
        date.DayOfWeek == DayOfWeek.Sunday);

    return Enumerable
        .Range (0, totalDays + 1)
        .Select(days => from.AddDays(days))
        .Count (date => (!skipWeekends || !isWeekend(date)) && !isHoliday(date)) - 1;
}