/// <summary>
/// Move to the next element
/// </summary>
/// <returns>Returns true if not at the end, false if it is</returns>
public bool MoveNext()
{
bool hasMore = true;
// First time through?
if (dates == null)
{
// If it's got a count, generate them all as we can't do it by yearly ranges. There shouldn't be
// too many although it's possible.
if (recurrence.MaximumOccurrences != 0)
{
dates = recurrence.InstancesBetween(start, DateTime.MaxValue);
}
else
{
// If it's got an end date, we'll generate instances in one year increments. This should be
// more efficient for long running or never ending sequences.
end = start.AddYears(1).AddSeconds(-1);
dates = recurrence.InstancesBetween(start, end);
}
}
else
{
idx++;
}
if (idx >= dates.Count)
{
// If it uses a count, we got them all on the first call so stop now
if (recurrence.MaximumOccurrences != 0)
{
hasMore = false;
}
else
{
idx = 0;
// Advance one year at a time until we get something or the end date is reached
do
{
if (start.Year < DateTime.MaxValue.Year)
{
start = end.AddSeconds(1);
if (start > recurrence.RecurUntil)
{
hasMore = false;
break;
}
}
else
{
hasMore = false;
break;
}
if (start.Year < DateTime.MaxValue.Year)
{
end = start.AddYears(1).AddSeconds(-1);
}
else
{
end = new DateTime(DateTime.MaxValue.Year, 12, 31, 23, 59, 59);
}
dates = recurrence.InstancesBetween(start, end);
} while(dates.Count == 0);
}
}
return(hasMore);
}
/// <summary>
/// Reset the enumerator to the start
/// </summary>
public void Reset()
{
idx = 0;
start = recurrence.StartDateTime;
dates = null;
}