问题
I'm working on "Add to Calendar" feature from my Sharepoint webpart (created using VS2010).
I have exported the ICS file programatically with no issues.
But the problem is when I try to open the ICS file from OUTLOOK.
If the ICS file has single appointment, no issues....
If the ICS file has multiple appointments, the problem comes...
When I do File >> Open >> Import >> Choose ics file, it works fine
But If I try to just double click the ICS file, it creates a NEW calendar instead of updating my existing default calendar
Any suggestions...?
回答1:
See this SO post which suggests that Outlook will only support multiple events using ICS as a feed or subscription - not directly as a single ICS import.
回答2:
We had a similar problem and found that if the ICS file had the X-WR-CALNAME field in it, even if is was blank, then Outlook would automatically create a new calendar. If it did NOT have this field in it, then Outlook imported it.
回答3:
I had the same problem. When clicking on a .ics file outlook creates a new calendar rather then updating a existing calendar.
I solved this by adding this descriptor in the .ics file:
X-WR-RELCALID:XXXXXX
where XXXXXX is a unique value for the calendar. Outlook will then ask you for replacing the calendar, rather than adding a new.
The descriptor was found on http://en.wikipedia.org/wiki/ICalendar
来源：https://stackoverflow.com/questions/9212329/ical-import-creates-new-calendar-when-open-the-ics-file