CODEWITHSUNDEEP
c#exchangewebservices
owen gerig
owen gerig

Reputation: 6172

EWS Getting all occurences from a master recurrence appointment

I use EWS FindAppointment to get all appointments between dates (see here for why Im using FindAppointments rather the FindItems)

// Set the start and end time and number of appointments to retrieve.
CalendarView cView = new CalendarView(start, end, 1000);
// Retrieve a collection of appointments by using the calendar view.
FindItemsResults<Appointment> findAppointmentResults = calendar.FindAppointments(cView);

I enumerate the results and create just a basic List of Appointments

Since FindAppointment does not return the Master for recurring meetings I use the AppointmentType.Occurrence appointments returned to get their Master

Appointment.BindToRecurringMaster(this.exchangeService, new ItemId(occurrence.Id.ToString()));

With this I form another List of all my Master Appointments.

I'm trying to use the Masters to retrieve every appointment in the series however thats where Im having trouble.
I tried to iterate through the list (as shown here, MSDN)

 public List<Appointment> getAllOccurrencesFromMaster(Appointment masterOccurrence) {
            List<Appointment> retVal = new List<Appointment>();


            int iCurrentIndex = 1;
            DateTime occurStart = masterOccurrence.Start;
            try {
                // Get the appointment that is located at the current index in the series.
                Appointment seriesAppt = Appointment.BindToOccurrence(this.exchangeService, new ItemId(masterOccurrence.Id.ToString()), iCurrentIndex);
                retVal.Add(seriesAppt);

                while (true) {
                    try {
                        Appointment appt = Appointment.BindToOccurrence(this.exchangeService, new ItemId(masterOccurrence.Id.ToString()), iCurrentIndex + 1);
                        retVal.Add(appt);
                    } catch (ServiceResponseException sre) {
                        Console.WriteLine("Occurrence with this index was previously deleted from the recurrence. " + sre.ToString());
                    } catch (Exception e) {
                            throw e;
                        }
                    }
                    iCurrentIndex++;
                }
            }catch (Exception e) {
                if (e.Message == "Occurrence index is out of recurrence range.") {
                    Console.WriteLine("The end of the series has been reached.");
                } else {
                    Console.WriteLine("bad error. " + e.ToString());
                    throw e;
                }
            }

            return retVal;
        }

My problem with the above code is that when a deleted item is reached it throws the same exception as when the index is out of range: ServiceResponseException.
Which is a problem because for one I want to continue and the other I want to break and Im not going to switch that based on the message text. And furthermore I need the deleted occurrences. How do I get all appointments in a recurring series?

I have also tried to use the DeletedOccurances property of the Master Appointment but none of the entries had their IDs populated. We do a Unidirectional sync from Exchange to our system, and I need to know whats deleted so I can remove it from our system. We keep track of the calenderItem.ID and so I need that when something is deleted to know which meeting to delete in our system.

Upvotes: 2

Views: 5166

Answers (2)

pjneary
pjneary

Reputation: 1246

Pretty old to follow up, but I had a need to iterate over a series and came across this post. The short answer to the original question is to use the ServiceResponseException.ErrorCode and you get ErrorCalendarOccurrenceIsDeletedFromRecurrence when you hit a missing instance, and ErrorCalendarOccurrenceIndexIsOutOfRecurrenceRange when you've hit the end of the series. HTH someone.

Upvotes: 2

owen gerig
owen gerig

Reputation: 6172

Instead of getting all appointments in the series. I used the Master Recurrence appointment.recurrence object as well as deleted and modified occurrences to figure out whats going on with the appointment and properly sync on our side of things.

Upvotes: 1

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