Getting Events from Calendar using C# and Microsoft Graph SDK

1
votes

I'm trying to develop a console app to list, remove and add events to a specific user's calendar. I'm developing a business process. I'm starting by listing events.

Calendar cal =
    client
    .Users["[email protected]"]
    .Calendars["AAMkAGIzZDM4O...."]
    .Request()
    .GetAsync()
    .Result;

I get the correct calendar back but the Events collection is null. There are 13 events in the calendar. I have Calendar Read/Write permissions.

Any ideas?

3
c#microsoft-graph-apimicrosoft-graph-sdks

3 Answers

3
votes

I don't have an environment to test the c# Graph SDK, but I suspect the underlying query doesn't ask Graph for the calendar events so that's why the field is null.

Using Graph explorer (https://developer.microsoft.com/en-us/graph/graph-explorer#), we can try an equivalent query and note only metadata about the calendars are returned.

GET https://graph.microsoft.com/v1.0/me/calendars

enter image description here

The Graph explorer has some calendar sample queries. They might not be visible by default, so click the 'show more samples' link.

enter image description here

The all events in my calendar sample query is probably what you're looking for. The request is:

GET https://graph.microsoft.com/v1.0/me/events?$select=subject,body,bodyPreview,organizer,attendees,start,end,location

(or /calendars/{calendar-id}/events if you want events for a specific calendar)

The next step is converting this REST API query into the SDK syntax to use in your application.

From this sample, a starting point is:

IUserEventsCollectionPage events = await graphClient.Me.Events.Request().GetAsync();

Besides querying the events, you might also want to look into querying the users calendar view which allows you to specify a start and end date.

1
votes

It's worth noting here that Calendars["..."].Events will only give you event masters.

An alternative is to use Calendars["..."].CalendarView with query options of "startDateTime" and "endDateTime" which will give you all the event instances in that time frame.

0
votes

Dan, thanks for the post. I realized my mistake after reading your post. Here is the code that works:

            string userEmail = "[email protected]";
            string calId = "AAMkAGIzZDM4OWI0LWN...….";

            ICalendarEventsCollectionPage events = client.Users[$"{userEmail}"]
                .Calendars[$"{calId}"]
                .Events.Request().GetAsync().Result;