static public List <DateTime> GetReccurence(String rrule, DateTime dtStart,
DateTime dtEnd)
{
//DAILY
//"FREQ=DAILY; INTERVAL=2;";
//"FREQ=DAILY;"
//RRULE:FREQ=DAILY;INTERVAL=10;COUNT=3;
//WEEKLY
//FREQ=WEEKLY;COUNT=10
//FREQ=WEEKLY;
//FREQ=WEEKLY;INTERVAL=2
//FREQ=WEEKLY;COUNT=10;BYDAY=TU,TH
//FREQ=WEEKLY;INTERVAL=2;COUNT=8;WKST=SU;BYDAY=TU,TH
//MONTHLY
//FREQ=MONTHLY;COUNT=10;BYDAY=FR;SETPOS=1
//FREQ=MONTHLY;INTERVAL=2;COUNT=10;BYDAY=SU;SETPOS=1,-1 первое и последнее воскресенье месяца
//FREQ=MONTHLY;COUNT=6;BYDAY=MO;SETPOS=-2
//FREQ=MONTHLY;BYMONTHDAY=-3
//FREQ=MONTHLY;COUNT=10;BYMONTHDAY=2,15
//FREQ=MONTHLY;COUNT=10;BYMONTHDAY=1,-1
//FREQ=MONTHLY;INTERVAL=18;COUNT=10;BYMONTHDAY=10,11,12,13,14,15
//FREQ=MONTHLY;INTERVAL=2;BYDAY=TU
//FREQ=MONTHLY;BYDAY=FR;BYMONTHDAY=13
//FREQ=MONTHLY;COUNT=3;BYDAY=TU,WE,TH;BYSETPOS=3
//FREQ=MONTHLY;BYDAY=MO,TU,WE,TH,FR;BYSETPOS=-2 - пердпослений рабочий день месяца
//FREQ=MONTHLY;BYDAY=MO;BYSETPOS=-1 - последний понедельник месяца
//FREQ=MONTHLY;COUNT=9;BYDAY=1MO, 3MO, 5MO; - каждый 2-й понедельник месяца
//FREQ=MONTHLY;COUNT=9;BYDAY=MO;SETPOS=1,3,5 - Каждый второй понедельник месяцв
//YEARLY
//FREQ=YEARLY;BYMONTH=1;BYDAY=SU,MO,TU,WE,TH,FR,SA
//FREQ=YEARLY;COUNT=10;BYYEARDAY=1,-1
//FREQ=YEARLY;COUNT=10;BYMONTH=6,7
//FREQ=YEARLY;INTERVAL=3;COUNT=10;BYYEARDAY=1,100,200
//FREQ=YEARLY;COUNT=10;BYYEARDAY=366, -366
//FREQ=YEARLY;BYDAY=MO;SETPOS=20
//FREQ=YEARLY;BYWEEKNO=20;BYDAY=MO
//FREQ=YEARLY;BYMONTH=3;BYDAY=TH
//FREQ=YEARLY;INTERVAL=1;BYMONTH=1;BYDAY=TU;BYMONTHDAY=1,2,3,4,5,6;WEEKNO=1;BYYEARDAY=3
//String rrule = "FREQ=YEARLY;BYDAY=MO;SETPOS=52";
RruleParam param = RruleParse(rrule);
param.DTStart = dtStart;
param.DTEnd = dtEnd;
return(param.GetRecurringDates());
}
//Util methods
static private RruleParam RruleParse(string rrule)
{
RruleParam retVal = new RruleParam();
StringBuilder regExpBld = new StringBuilder();
regExpBld.Append("(?:FREQ=(?<FREQ>[^;]+)|");
regExpBld.Append("COUNT=(?<COUNT>[^;]+)|");
regExpBld.Append("INTERVAL=(?<INTERVAL>[^;]+)|");
regExpBld.Append("WKST=(?<WKST>[^;]+)|");
regExpBld.Append("SETPOS=(?<SETPOS>[^;]+)|");
regExpBld.Append("BYMONTH=(?<BYMONTH>[^;]+)|");
regExpBld.Append("INTERVAL=(?<INTERVAL>[^;]+)|");
regExpBld.Append("BYDAY=(?<BYDAY>[^;]+)|");
regExpBld.Append("BYMONTHDAY=(?<BYMONTHDAY>[^;]+)|");
regExpBld.Append("BYWEEKNO=(?<BYWEEKNO>[^;]+)|");
regExpBld.Append("BYYEARDAY=(?<BYYEARDAY>[^;]+))");
Regex rruleParser = new Regex(regExpBld.ToString());
MatchCollection matches = rruleParser.Matches(rrule);
foreach (Match match in matches)
{
string capture = match.Groups["FREQ"].Value;
if (!String.IsNullOrEmpty(capture))
{
if (capture.Equals("DAILY", StringComparison.InvariantCultureIgnoreCase))
{
retVal.freqHandler = Daily;
}
else if (capture.Equals("WEEKLY", StringComparison.InvariantCultureIgnoreCase))
{
retVal.freqHandler = Weekly;
}
else if (capture.Equals("MONTHLY", StringComparison.InvariantCultureIgnoreCase))
{
retVal.freqHandler = Monthly;
}
else if (capture.Equals("YEARLY", StringComparison.InvariantCultureIgnoreCase))
{
retVal.freqHandler = Yearly;
}
else
{
throw new ArgumentException("FREQ");
}
}
capture = match.Groups["COUNT"].Value;
if (!String.IsNullOrEmpty(capture))
{
retVal.Count = Convert.ToInt32(capture);
}
capture = match.Groups["INTERVAL"].Value;
if (!String.IsNullOrEmpty(capture))
{
retVal.Interval = Convert.ToInt32(capture);
}
capture = match.Groups["SETPOS"].Value;
if (!String.IsNullOrEmpty(capture))
{
retVal.Setpos = ConvertParam <int>(capture);
}
capture = match.Groups["WKST"].Value;
if (!String.IsNullOrEmpty(capture))
{
retVal.WkST = ConvertParam <DayOfWeek>(capture)[0];
}
capture = match.Groups["BYMONTH"].Value;
if (!String.IsNullOrEmpty(capture))
{
retVal.byMonth = ConvertParam <int>(capture);
}
capture = match.Groups["BYDAY"].Value;
if (!String.IsNullOrEmpty(capture))
{
retVal.ByDay = ConvertParam <DayOfWeek>(capture);
}
capture = match.Groups["BYMONTHDAY"].Value;
if (!String.IsNullOrEmpty(capture))
{
retVal.byMonthDay = ConvertParam <int>(capture);
}
capture = match.Groups["BYWEEKNO"].Value;
if (!String.IsNullOrEmpty(capture))
{
retVal.byWeekno = ConvertParam <int>(capture);
}
capture = match.Groups["BYYEARDAY"].Value;
if (!String.IsNullOrEmpty(capture))
{
retVal.byYearDay = ConvertParam <int>(capture);
}
}
return(retVal);
}
static private List <DateTime> Daily(RruleParam param)
{
return(Daily(param.Count, param.Interval, param.DTStart, param.DTEnd));
}
static private List <DateTime> Weekly(RruleParam param)
{
return(Weekly(param.Count, param.Interval, param.ByDay,
param.DTStart, param.DTEnd));
}
static private List <DateTime> Monthly(RruleParam param)
{
return(Monthly(param.Count, param.Interval, param.Setpos, param.byMonthDay, param.ByDay,
param.DTStart, param.DTEnd));
}
static private List <DateTime> Yearly(RruleParam param)
{
return(Yearly(param.Count, param.Interval, param.Setpos, param.ByDay, param.WkST,
param.byMonthDay, param.byYearDay, param.byMonth, param.byWeekno,
param.DTStart, param.DTEnd));
}