How to create a simple calendar event

[aguyfromdenmark]

Note: I am not sure if this is related to this issue, but when I generate a Calendar with an event, the Calendar contains no events. Using version 4.3.0 and .net 6.0.

Code for generation:

var calendarEvent = new CalendarEvent
{
  Name = "Example event",
  Description = "Event description goes here",
  Start = new CalDateTime(DateTime.Now),
  End = new CalDateTime(DateTime.Now.AddHours(2))
};

var calendar = new Ical.Net.Calendar();
calendar.Events.Add(calendarEvent);
calendar.AddTimeZone(new VTimeZone("Europe/Copenhagen"));
var serializer = new CalendarSerializer();
var serializedCalendar = serializer.SerializeToString(calendar);

What is begin generated:

BEGIN:VCALENDAR
PRODID:-//github.com/ical-org/ical.net//NONSGML ical.net 4.0//EN
VERSION:2.0
BEGIN:EXAMPLE EVENT
DESCRIPTION:Event description goes here
DTEND:20241014T163428
DTSTAMP:20241014T123428Z
DTSTART:20241014T143428
SEQUENCE:0
UID:5067645b-57d2-4d74-80ab-54f8f0cc1cbc
END:EXAMPLE EVENT
BEGIN:VTIMEZONE
TZID:Europe/Copenhagen
X-LIC-LOCATION:Europe/Copenhagen
END:VTIMEZONE
END:VCALENDAR

the tag for event is missing from the generated content. If you try and import the .ics file into for example Outlook, it says that there are no events in the calendar.

[axunonb]

Just double-checked with v4.2.0 to exclude your hint to this issue
Looks like the result using your code snippet is identical:

BEGIN:VCALENDAR
PRODID:-//github.com/ical-org/ical.net//NONSGML ical.net 4.0//EN
VERSION:2.0
BEGIN:EXAMPLE EVENT
DESCRIPTION:Event description goes here
DTEND:20241014T163428
DTSTAMP:20241014T123428Z
DTSTART:20241014T143428
SEQUENCE:0
UID:5067645b-57d2-4d74-80ab-54f8f0cc1cbc
END:EXAMPLE EVENT
BEGIN:VTIMEZONE
TZID:Europe/Copenhagen
X-LIC-LOCATION:Europe/Copenhagen
END:VTIMEZONE
END:VCALENDAR

Can you confirm?

[aguyfromdenmark]

@axunonb Yes, they look the same. It seems to be missing the BEGIN:VEVENT and END:VEVENT tags, as seen in the example here.

[axunonb]

Here is the corrected code.
If you set the CalendarEvent.Name it MUST be RFC 5545 compliant.

var date = new CalDateTime(2024, 10, 15, 11, 0, 0);
var calendarEvent = new CalendarEvent
{
    // If Name property is used, it MUST be RFC 5545 compliant
    Summary = "Event Title", // Should always be present
    Description = "Event description goes here", // optional
    Start = new CalDateTime(date),
    End = new CalDateTime(date.AddHours(2)),
};

var calendar = new Ical.Net.Calendar();
calendar.Events.Add(calendarEvent);
calendar.AddTimeZone(new VTimeZone("Europe/Copenhagen")); // TZ should be added
var serializer = new CalendarSerializer();
var serializedCalendar = serializer.SerializeToString(calendar);
Console.WriteLine(serializedCalendar);

Output (DTSTAMP and UID will differ):

BEGIN:VCALENDAR
PRODID:-//github.com/ical-org/ical.net//NONSGML ical.net 4.0//EN
VERSION:2.0
BEGIN:VEVENT
DESCRIPTION:Event description goes here
DTEND:20241015T130000
DTSTAMP:20241015T110000
DTSTART:20241015T110000
SEQUENCE:0
SUMMARY:Event Title
UID:a4982558-e1aa-412e-8610-e2102fe0e616
END:VEVENT
BEGIN:VTIMEZONE
TZID:Europe/Copenhagen
X-LIC-LOCATION:Europe/Copenhagen
END:VTIMEZONE
END:VCALENDAR

[aguyfromdenmark]

Yep. That works. A bit confusing with the naming of the properties there. Thanks.

[axunonb]

The sample code has been added to the Wiki