如何使用c＃.net查找每月的第二和第四个星期六

识别每个月的第二个和第四个星期六我有点忙，但我写了Linq方法从列表获得2.和4.星期六< DateTime> ：

I'm bit busy, but i wrote Linq method to get 2. and 4. saturday from the List<DateTime>:

List<DateTime> MyCalendar = new List<DateTime>(); //create list
DateTime currDate = new DateTime(2016,1,1); //initial value
//add days to MyCalendar
while(currDate<=new DateTime(2016,12,31))
{
    MyCalendar.Add(currDate);
    currDate = currDate.AddDays(1);
}
//method to get 2. and 4. saturday in month
var result = MyCalendar.Where(x=>x.DayOfWeek==DayOfWeek.Saturday)
                .GroupBy(x=>x.Month)
                .SelectMany(grp=>
                    grp.Select((d, counter)=>new
                    {
                        Month = grp.Key,
                        PosInMonth = counter+1,
                        Day = d
                    }))
                .Where(x=>x.PosInMonth==2 || x.PosInMonth==4)
                .ToList();

为了能够查看结果列表，你必须使用 foreach（。 ..）{} 循环。

To be able to go through the result list, you have to use foreach(...){} loop.

foreach(var d in result)
{
    Console.WriteLine("{0} {1} {2}", d.Month, d.PosInMonth, d.Day);
}

重要说明：我建议编写继承自日历 [ ^ ]要扩展它在 GetNthDayInMonth（）上的方法。这应该使您有可能使自定义日历以特定的文化 [ ^ ]。



试试！

Important note: I'd suggest to write custom class which inherits from Calendar[^] to extend its methods on GetNthDayInMonth(). This should give you a possibilty to make custom calendar conditional on specific Culture[^].

Try!

这是一个简单的解决方案。

Here is simple solution.

class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Second Saturday of Month: " + GetSaturdayByWeek(DateTime.Now, 2).ToShortDateString());
         Console.WriteLine("Fourth Saturdays of Month: " + GetSaturdayByWeek(DateTime.Now, 4).ToShortDateString());
            
        }

        private static DateTime GetSaturdayByWeek(DateTime dateofMonth, int weekNumber)
        {
            DateTime firstDateofMonth = new DateTime(dateofMonth.Year, dateofMonth.Month, 1);
            DateTime resultDate = CultureInfo.InvariantCulture.Calendar.AddWeeks(firstDateofMonth, weekNumber - 1);
            int day = Convert.ToInt32(resultDate.DayOfWeek) < 6 ? (Convert.ToInt32(resultDate.DayOfWeek) - 6) * -1 : 0;
            return resultDate.AddDays(day);
        }
    }

查看开发人员的小巷|如何获得一个月的第n天 [ ^ ]