如何从两个 Datepicker 中选择的两个日期之间的特定持续时间中排除停电日？

Question

I have two Datepicker and my object saves the duration between them with an excluding to the blackout days that exist between the two selected days. (every Datepicker has blackout days)

          foreach (Model item in listmodels)
                
                {
                    DateFrom.BlackoutDates.Add(new CalendarDateRange((item.startDate), (item.endDate)));
                }

                start_date = DateFrom.SelectedDate.Value;
                end_date = DateTo.SelectedDate.Value;
                var enddate = end_date.Date;
                var startdate = start_date.Date;
                
                leave_days = Convert.ToInt32(enddate.Subtract(startdate).TotalDays);

I suppose that the date range (Timespan duration) will be between 3/3/2021 and 3/27/2021 ,

What I get is: 24 days

The duration between these two dates should be ( expected result ) if I exclude Sunday and Saturday ( weekend) and the blackout days that are presented as holidays: 17 days

How can I do that?

Answer 1

You can do your calc with code like this

DateTime start = new DateTime(2021,3,3);
DateTime end = new DateTime(2021,3,27);

// if you want to include the 27 then add + 1 after TotalDays
var days = Enumerable.Range(0, (int)(end - start).TotalDays)
          .Select(x => start.AddDays(x))
          .Where(z => z.DayOfWeek != DayOfWeek.Saturday && z.DayOfWeek != DayOfWeek.Sunday)
          .Count();

If you have a custom list of days that you have applied to the control as BlackoutDates then you can use that collection to exclude them from the count

DateTime start = new DateTime(2021,3,3);
DateTime end = new DateTime(2021,3,27);

List<DateTime> blackOut = new List<DateTime>
{
    new DateTime(2021,3,10),
    new DateTime(2021,3,11)
    
};

var days = Enumerable.Range(0, (int)(end - start).TotalDays)
          .Select(x => start.AddDays(x))
          .Where(z => z.DayOfWeek != DayOfWeek.Saturday && 
                      z.DayOfWeek != DayOfWeek.Sunday &&
                      !blackOut.Contains(z))
          .Count();