protected void IncrementDate(ref DateTime dt, RecurrencePattern pattern, int interval)
{
// FIXME: use a more specific exception.
if (interval == 0)
{
throw new Exception("Cannot evaluate with an interval of zero. Please use an interval other than zero.");
}
var old = dt;
switch (pattern.Frequency)
{
case FrequencyType.Secondly:
dt = old.AddSeconds(interval);
break;
case FrequencyType.Minutely:
dt = old.AddMinutes(interval);
break;
case FrequencyType.Hourly:
dt = old.AddHours(interval);
break;
case FrequencyType.Daily:
dt = old.AddDays(interval);
break;
case FrequencyType.Weekly:
dt = DateUtil.AddWeeks(old, interval, pattern.FirstDayOfWeek);
break;
case FrequencyType.Monthly:
dt = old.AddDays(-old.Day + 1).AddMonths(interval);
break;
case FrequencyType.Yearly:
dt = old.AddDays(-old.DayOfYear + 1).AddYears(interval);
break;
// FIXME: use a more specific exception.
default:
throw new Exception("FrequencyType.NONE cannot be evaluated. Please specify a FrequencyType before evaluating the recurrence.");
}
}