using System;

using System.Collections.Generic;

using System.Globalization;

using System.IO;

using System.Linq;

using System.Text.RegularExpressions;

using System.Threading;

using Ical.Net.CalendarComponents;

using Ical.Net.DataTypes;

using Ical.Net;

using Ical.Net.Evaluation;

using Ical.Net.Serialization;

using Ical.Net.Serialization.DataTypes;

using Ical.Net.Utility;

​

public class Program

{

    public static void Main()

    {

        // https://github.com/ical-org/ical.net/issues/614

        // Example 2

             // Arrange

            Guid id = Guid.NewGuid();

            string timeZoneId = TimeZoneInfo.Local.Id; // GMT Standard Time

            DateTime start = new DateTime(2024, 10, 19, 18, 0, 0, DateTimeKind.Local);

            DateTime end = new DateTime(2024, 10, 19, 19, 0, 0, DateTimeKind.Local);

            DateTime exceptionDate = new DateTime(2024, 10, 19, 21, 0, 0, DateTimeKind.Local);

            RecurrencePattern recurrencePattern = new RecurrencePattern(FrequencyType.Hourly);

            recurrencePattern.Count = 2;

            recurrencePattern.Interval = 3;

​

            IDateTime exceptionOccurrsOn = new CalDateTime(exceptionDate, timeZoneId);

            PeriodList exceptionDates = new PeriodList();

            exceptionDates.Add(exceptionOccurrsOn);

            exceptionDates.Add(exceptionOccurrsOn.AddDays(1));

​

            CalendarEvent myRecurringEvent = new CalendarEvent();

            myRecurringEvent.Summary = "My Recurring Event";

            myRecurringEvent.Uid = id.ToString();

            myRecurringEvent.Start = new CalDateTime(start, timeZoneId);

            myRecurringEvent.End = new CalDateTime(end, timeZoneId);

            myRecurringEvent.RecurrenceRules.Add(recurrencePattern);

            myRecurringEvent.ExceptionDates.Add(exceptionDates);

​

            Ical.Net.Calendar calendar = new Ical.Net.Calendar();

            calendar.Events.Add(myRecurringEvent);

​

            // Act

            CalendarSerializer serializer = new CalendarSerializer();

            string schedulerData = serializer.SerializeToString(calendar);

            Console.WriteLine(schedulerData);

​

            Ical.Net.Calendar deserializedCalendar = Ical.Net.Calendar.Load(schedulerData);

​

            DateTime date = new DateTime(2024, 10, 19);

            HashSet<Occurrence> occurrences = deserializedCalendar.GetOccurrences<CalendarEvent>(date);

​

            // Assert: Should be 1

            Console.WriteLine(occurrences.Count());

    }

}