internal override List <ComponentLine> BuildLines()
{
List <ComponentLine> lines = new List <ComponentLine>
{
new ComponentLine("DTSTAMP:", DateTime.Now, true),
new ComponentLine("SEQUENCE:", Sequence),
new ComponentLine("UID:", $"{Code}@icalendar-API"),
new ComponentLine("TRIGGER:", TriggerDate, true),
new ComponentLine("ACTION:", ActionType),
new ComponentLine("REPEAT:", MathExt.Max <int>(Repeat, 1)),
new ComponentLine("DURATION:", Duration.ToString()),
new ComponentLine("DUE:", DueDate, true),
new ComponentLine("PERCENT-COMPLETE:", PercentageComplete.ForceToRange(0, 100)),
new ComponentLine("PRIORITY:", Priority.ForceToRange(0, 9)),
new ComponentLine("COMPLETED:", Completed.Coalesce(DateTime.Today.AddDays(1)), true)
};
lines.AddRange(Attachments.Select(a => a.BuildLine()));
return(BuildComponent(lines));
}