Generate Occurrences from a Recurrence Pattern

With Aspose.Email, it is possible to generate occurrences using a recurrence pattern. This article explains how, how to generate the next occurrence and get user friendly item descriptions. Occurrences from a MAPI calendar recurrence pattern can be generated using Aspose.Email. The following code snippet shows you how to generate occurrences from recurrence patterns.

Calculate the Next Occurrence or n Next Occurrences

To get the “next” occurrence, use the GenerateOccurrences method with the parameter nNextOccurrences=1. The following code snippet shows you how to generates 20 occurrences by using nNextOccurrences = 20. The output of the code below is as follows:

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// For complete examples and data files, please go to https://github.com/aspose-email/Aspose.Email-for-.NET
RecurrencePattern recurrencePattern = new RecurrencePattern();
recurrencePattern.StartDate = new DateTime(1997, 9, 10, 9, 0, 0);
RecurrenceRule rule = recurrencePattern.RRules.Add();
rule.Frequency = Frequency.Monthly;
rule.Count = 20;
rule.Interval = 18;
rule.ByMonthDay.Add(new int[] { 10, 11, 12, 13, 14, 15 });
DateCollection expectedDates = recurrencePattern.GenerateOccurrences(20);
Console.WriteLine("expectedDates.Count = " + expectedDates.Count);
foreach (DateTime date in expectedDates)
{
Console.WriteLine("DateTime = " + date);
}

Get User Friendly Text for a Recurrence

User friendly text for a rule can be obtained using the FriendlyText property as shown below. The output of the code will be: “Recur every month on the 1st and 1st from end day(s) of the month for a maximum of 2 occurrences.”. The following code snippet shows you how to get user friendly text for a recurrence.

// For complete examples and data files, please go to https://github.com/aspose-email/Aspose.Email-for-.NET
RecurrenceRule rule = new RecurrenceRule();
rule.Frequency = Frequency.Monthly;
rule.Count = 2;
rule.ByMonthDay.Add(1);
rule.ByMonthDay.Add(-1);
Console.WriteLine(rule.FriendlyText);