如何获得下一个工作日，周末和节假日除外

问题描述

我有一个需要在日期字段上工作的要求，所以要求是这样的东西

I have a requirement where I need to work on a date field, so the requirement is some thing like this

我将字段称为 minimum可能的日期

1. 为日期添加+1

1. Add +1 to the date

如果最短的日期恰好是添加1天后的周末（星期六或星期日），请显示下一个工作日，即星期一

If the minimum possible date happens to fall on a weekend(Sat or Sun) after adding 1 day, Display the next working day i.e Monday

如果最短的日期正好是假期，请显示下一个工作日。 （假日1.1、1.5、3.10、25.12、26.12）

If the minimum possible date happens to fall on a Holiday, display the next working day. (Holidays 1.1 , 1.5 , 3.10 , 25.12 , 26.12)

如果最短日期恰好是加了1天后的周末（星期六或星期日） ，然后第二天是假期，然后显示下一个工作日。例如：+1天后（如果可能的最小日期是星期六），我们将不得不显示星期一。但是，如果星期一恰好是假期，那么我们必须显示星期二。

If the minimum possible date happens to fall on a weekend(Sat or Sun) after adding 1 day, and the day after that is a holiday then show the next working day. Eg: After +1 day if min possible day is Saturday, we will have to display Monday. But if Monday happens to be a Holiday then we have to display Tuesday.

我已经尝试了上述解决方案通过有多个if和else案例来解决问题，但是只是想知道是否有任何通用且优美的方式？

I have tried a solution to the above problem by having multiple if and else cases, but just wondering if there is any generic and graceful way of doing it?

我尝试过

var Holidays = new List<DateTime>();
Holidays.Add(new DateTime(DateTime.Now.Year,1,1));
Holidays.Add(new DateTime(DateTime.Now.Year,1,5));
Holidays.Add(new DateTime(DateTime.Now.Year,3,10));
Holidays.Add(new DateTime(DateTime.Now.Year,12,25));

if(date.DayOfWeek === DayOfWeek.Saturday || date.DayOfWeek === DayOfWeek.Sunday)

{

     //Logic to add +1 and again some logic to check for weekends and weekdays
}


else if(holidays.Contain(date))
{

   //Logic to add +1 and again some logic to check for weekends and weekdays
}

推荐答案

基本上，您想获得下一个工作日。因此，您可以在这种情况下循环运行，将当前日期添加1天

Basically you want to get the next working day. So you could loop on this condition adding 1 day to the current date

do {
  date = date.AddDays(1);
} while(IsHoliday(date) || IsWeekend(date));

在上一个代码中， IsHoliday 是一个谓词告诉日期是否是假期。例如，无耻地重用您的代码：

In the previous code IsHoliday is a predicate telling if a date is holiday. For instance, shamelessly reusing your code:

class Program
{
    private static readonly HashSet<DateTime> Holidays = new HashSet<DateTime>();

    private static bool IsHoliday(DateTime date)
    {
        return Holidays.Contains(date);
    }

    private static bool IsWeekend(DateTime date)
    {
        return date.DayOfWeek == DayOfWeek.Saturday
            || date.DayOfWeek == DayOfWeek.Sunday;
    }


    private static DateTime GetNextWorkingDay(DateTime date)
    {
        do
        {
            date = date.AddDays(1);
        } while (IsHoliday(date) || IsWeekend(date));
        return date;
    }

    static void Main(string[] args)
    {
        Holidays.Add(new DateTime(DateTime.Now.Year, 1, 1));
        Holidays.Add(new DateTime(DateTime.Now.Year, 1, 5));
        Holidays.Add(new DateTime(DateTime.Now.Year, 3, 10));
        Holidays.Add(new DateTime(DateTime.Now.Year, 12, 25));

        var dt = GetNextWorkingDay(DateTime.Parse(@"2015-10-31"));

        Console.WriteLine(dt);

        Console.ReadKey();
    }
}

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