private static void AdjustForRepeatOnMonths(ref DateTime dt, eMonthRecurrence repeatOnMonths)
{
while (((int)Math.Pow(2, (dt.Month - 1)) & (int)repeatOnMonths) == 0)
dt = dt.AddMonths(1);
}
private static DateTime GetNextMonthlyRecurrence(DateTime startDate, eRelativeDayInMonth repeatOnRelativeDayInMonth, DayOfWeek relativeDayOfWeek, int repeatOnDayOfMonth, eMonthRecurrence repeatOnMonths)
{
Calendar cal = GetCalendar();
if (repeatOnRelativeDayInMonth == eRelativeDayInMonth.None)
{
DateTime dt = startDate.AddDays(cal.GetDaysInMonth(startDate.Year, startDate.Month) - startDate.Day + 1);
if (repeatOnMonths != eMonthRecurrence.All) AdjustForRepeatOnMonths(ref dt, repeatOnMonths); // Adjust for repeat on Months
return dt.AddDays(Math.Min(cal.GetDaysInMonth(dt.Year, dt.Month), repeatOnDayOfMonth) - 1);
}
else
{
if (repeatOnRelativeDayInMonth == eRelativeDayInMonth.First)
{
DateTime dt = startDate.AddDays(cal.GetDaysInMonth(startDate.Year, startDate.Month) - startDate.Day + 1);
if (repeatOnMonths != eMonthRecurrence.All) AdjustForRepeatOnMonths(ref dt, repeatOnMonths); // Adjust for repeat on Months
while (dt.DayOfWeek != relativeDayOfWeek)
dt = dt.AddDays(1);
return dt;
}
else if (repeatOnRelativeDayInMonth == eRelativeDayInMonth.Last)
{
DateTime dt = startDate.AddDays(cal.GetDaysInMonth(startDate.Year, startDate.Month) - startDate.Day + 1);
if (repeatOnMonths != eMonthRecurrence.All) AdjustForRepeatOnMonths(ref dt, repeatOnMonths); // Adjust for repeat on Months
dt = dt.AddDays(cal.GetDaysInMonth(dt.Year, dt.Month) - 1);
while (dt.DayOfWeek != relativeDayOfWeek)
dt = dt.AddDays(-1);
return dt;
}
else
{
// Second, third and forth
int relCount = 2;
if (repeatOnRelativeDayInMonth == eRelativeDayInMonth.Third)
relCount = 3;
else if (repeatOnRelativeDayInMonth == eRelativeDayInMonth.Fourth)
relCount = 4;
DateTime dt = startDate.AddDays(cal.GetDaysInMonth(startDate.Year, startDate.Month) - startDate.Day);
if (repeatOnMonths != eMonthRecurrence.All) AdjustForRepeatOnMonths(ref dt, repeatOnMonths); // Adjust for repeat on Months
while (relCount > 0)
{
dt = dt.AddDays(1);
if (dt.DayOfWeek == relativeDayOfWeek)
relCount--;
}
return dt;
}
}
throw new InvalidOperationException("Could not find the next relative date for monthly recurrence starting on " + startDate.ToString() + " RelativeDayInMonth=" + repeatOnRelativeDayInMonth.ToString() + " RelativeDayOfWeek=" + relativeDayOfWeek.ToString());
}
private void OnRepeatOnMonthsChanged(eMonthRecurrence oldValue, eMonthRecurrence newValue)
{
OnPropertyChanged(new PropertyChangedEventArgs("RepeatOnMonths"));
}
