public IEnumerable <Occurrence> GetOccurrences(int maxPostNowOccurrences = 100)
{
Requires.Valid(this, this.GetType().Name);
uint occNum = 0;
var now = DateTime.UtcNow;
int postNowOccurrences = 0;
var dt = AllDay ?
new DateTime(StartDate.Year, StartDate.Month, StartDate.Day, 0, 0, 0, 0, DateTimeKind.Utc) :
new DateTime(StartDate.Year, StartDate.Month, StartDate.Day, StartTimeUtc.Hour, StartTimeUtc.Minute, StartTimeUtc.Second, StartTimeUtc.Millisecond, DateTimeKind.Utc);
while (
IsPerpetual ||
(EndAfterNOccurrences > 0 && occNum < EndAfterNOccurrences) ||
(EndBeforeDate.HasValue && dt < EndBeforeDate))
{
if (dt > now && ++postNowOccurrences > maxPostNowOccurrences)
{
break;
}
yield return(new Occurrence(dt, Duration, occNum++));
switch (PatternType)
{
case PatternTypes.Daily:
if (DailyPattern.EveryNDays > 0)
{
dt = dt.AddDays(DailyPattern.EveryNDays);
}
else if (DailyPattern.EveryWeekday)
{
do
{
dt = dt.AddDays(1);
} while (!dt.IsWeekday());
}
else
{
throw new NotImplementedException();
}
break;
case PatternTypes.Weekly:
for (;;)
{
dt = dt.AddDays(1);
if (dt.DayOfWeek == DayOfWeek.Sunday)
{
dt = dt.AddDays((WeeklyPattern.RecurEveryNWeeksOn - 1) * 7);
}
if (WeeklyPattern.OccursOn(dt.DayOfWeek))
{
break;
}
}
break;
}
}
}
