Update a recurring series by using EWS
Learn how to modify appointments in a recurring series by using the EWS Managed API or EWS in Exchange.
You can use the EWS Managed API or EWS to update a recurring series by either updating the entire series, or by updating a single occurrence. In this article we'll discuss how to update a single occurrence.
Modifying a single appointment in a series is very similar to modifying a single instance appointment. You use the same methods and operations, but you use the item ID of the occurrence you want to change.
When you change a single occurrence in a series, that occurrence is added to an array of modified appointments associated with the recurring master for the series. You can use the Appointment.ModifiedOccurrences EWS Managed API property or the ModifiedOccurrences EWS element to access all the appointments in a series that have been modified.
Modify a single occurrence in a series by using the EWS Managed API
Bind to the occurrence you want to modify by using either the Appointment.BindToOccurrence method with the item's index value, or the Appointment.Bind method with the occurrence's ID. You obtain this ID from either the Id property of an Appointment object that corresponds to the occurrence, or from the ItemId property of the OccurrenceInfo object that corresponds to the occurrence.
Update the properties on the occurrence's Appointment object.
Save the changes to the occurrence's appointment object by using the Appointment.Save method.
The following example updates an appointment in a recurring series and verifies that the modified appointment is updated on the recurring master. This example assumes that you have authenticated to an Exchange server and have acquired an ExchangeService object named service. The recurrenceMasterId parameter is an identifier associated with the recurring master for the occurrence to modify.
public static ItemId ModifyARecurringSeries(ExchangeService service, ItemId recurrenceMasterId)
{
Appointment calendarItem = Appointment.Bind(service, recurrenceMasterId, new PropertySet(AppointmentSchema.AppointmentType));
Appointment recurrMaster = new Appointment(service);
if (calendarItem.AppointmentType == AppointmentType.RecurringMaster)
{
// Get the recurring master from an occurrence in a recurring series with the properties you need.
recurrMaster = Appointment.Bind(service,
recurrenceMasterId,
new PropertySet(AppointmentSchema.AppointmentType,
AppointmentSchema.Subject,
AppointmentSchema.FirstOccurrence,
AppointmentSchema.LastOccurrence,
AppointmentSchema.ModifiedOccurrences,
AppointmentSchema.DeletedOccurrences));
}
else
{
Console.WriteLine("Item id was not for a recurring master.");
return recurrenceMasterId;
}
// Bind to the second occurrence in the series with the properties to modify.
Appointment occurrenceToModify = Appointment.BindToOccurrence(service,
recurrMaster.Id,
2,
new PropertySet(AppointmentSchema.Location,
AppointmentSchema.Start,
AppointmentSchema.End,
AppointmentSchema.RequiredAttendees,
AppointmentSchema.Subject));
// Update the properties you want to change.
occurrenceToModify.Location = "Helipad of Contoso Bldg 1";
occurrenceToModify.Start = occurrenceToModify.Start.AddDays(1);
occurrenceToModify.End = occurrenceToModify.End.AddDays(1);
occurrenceToModify.RequiredAttendees.Add("Contoso CEO", "sadie@contoso");
occurrenceToModify.RequiredAttendees.Add("Contoso Head of Research", "ronnie@contoso.com");
occurrenceToModify.RequiredAttendees.Add("Contoso Head of Security", "alfred@contoso.com");
occurrenceToModify.Subject = occurrenceToModify.Subject.ToString() + ":Mandatory";
// Update the occurrence in your calendar folder and send meeting update requests to attendees.
// This method call results in an UpdateItem request to EWS.
occurrenceToModify.Update(ConflictResolutionMode.AlwaysOverwrite, SendInvitationsOrCancellationsMode.SendToAllAndSaveCopy);
// View updated and deleted occurrences on the recurring master prior to retrieving updated information.
Console.WriteLine("Modified Occurrences prior to updating recurring master: {0}",
(recurrMaster.ModifiedOccurrences == null ? "None" : recurrMaster.ModifiedOccurrences.Count.ToString()));
// Update the recurring master to view the modified and deleted occurrences.
recurrMaster = Appointment.Bind(service, recurrenceMasterId, new PropertySet(AppointmentSchema.ModifiedOccurrences,
AppointmentSchema.DeletedOccurrences));
// View updated and deleted occurrences on the recurring master after retrieving updated information.
Console.WriteLine("Modified Occurrences after updating recurring master:\t {0}",
(recurrMaster.ModifiedOccurrences == null ? "None" : recurrMaster.ModifiedOccurrences.Count.ToString()));
return recurrMaster.Id;
}
Modify a single occurrence in a series by using EWS
Modifying a single instance in a series is essentially the same as modifying a single instance appointment. You can specify the occurrence to change by using either an ItemId or an OccurrenceItemId element.
The following example shows the request XML when you use the UpdateItem operation to update an occurrence in a recurring series of appointments. The ItemId and ChangeKey are shortened for readability.
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages"
xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types"
xmlns:soap="https://schemas.xmlsoap.org/soap/envelope/">
<soap:Header>
<t:RequestServerVersion Version="Exchange2010" />
</soap:Header>
<soap:Body>
<m:UpdateItem ConflictResolution="AlwaysOverwrite" SendMeetingInvitationsOrCancellations="SendToAllAndSaveCopy">
<m:ItemChanges>
<t:ItemChange>
<t:ItemId Id="AAMkA" ChangeKey="DwAAAB" />
<t:Updates>
<t:SetItemField>
<t:FieldURI FieldURI="calendar:Location" />
<t:CalendarItem>
<t:Location>Helipad of Contoso Bldg 1</t:Location>
</t:CalendarItem>
</t:SetItemField>
<t:SetItemField>
<t:FieldURI FieldURI="calendar:Start" />
<t:CalendarItem>
<t:Start>2014-03-27T19:33:00.000-07:00</t:Start>
</t:CalendarItem>
</t:SetItemField>
<t:SetItemField>
<t:FieldURI FieldURI="calendar:End" />
<t:CalendarItem>
<t:End>2014-03-27T20:33:00.000-07:00</t:End>
</t:CalendarItem>
</t:SetItemField>
<t:SetItemField>
<t:FieldURI FieldURI="calendar:RequiredAttendees" />
<t:CalendarItem>
<t:RequiredAttendees>
<t:Attendee>
<t:Mailbox>
<t:Name>Mack@contoso.com</t:Name>
<t:EmailAddress>Mack@contoso.com</t:EmailAddress>
<t:RoutingType>SMTP</t:RoutingType>
</t:Mailbox>
</t:Attendee>
<t:Attendee>
<t:Mailbox>
<t:Name>Sadie@contoso.com</t:Name>
<t:EmailAddress>Sadie@contoso.com</t:EmailAddress>
<t:RoutingType>SMTP</t:RoutingType>
</t:Mailbox>
</t:Attendee>
<t:Attendee>
<t:Mailbox>
<t:Name>Magdalena@contoso.com</t:Name>
<t:EmailAddress>Magdalena@contoso.com</t:EmailAddress>
<t:RoutingType>SMTP</t:RoutingType>
</t:Mailbox>
</t:Attendee>
<t:Attendee>
<t:Mailbox>
<t:Name>Contoso CEO</t:Name>
<t:EmailAddress>sadie@contoso</t:EmailAddress>
</t:Mailbox>
</t:Attendee>
<t:Attendee>
<t:Mailbox>
<t:Name>Contoso Head of Research</t:Name>
<t:EmailAddress>ronnie@contoso.com</t:EmailAddress>
</t:Mailbox>
</t:Attendee>
<t:Attendee>
<t:Mailbox>
<t:Name>Contoso Head of Security</t:Name>
<t:EmailAddress>alfred@contoso.com</t:EmailAddress>
</t:Mailbox>
</t:Attendee>
</t:RequiredAttendees>
</t:CalendarItem>
</t:SetItemField>
<t:SetItemField>
<t:FieldURI FieldURI="item:Subject" />
<t:CalendarItem>
<t:Subject>Weekly Update Meeting:Mandatory</t:Subject>
</t:CalendarItem>
</t:SetItemField>
</t:Updates>
</t:ItemChange>
</m:ItemChanges>
</m:UpdateItem>
</soap:Body>
</soap:Envelope>
The server responds to the UpdateItem request with an UpdateItemResponse message that includes a ResponseCode value of NoError, which indicates that the occurrence was updated successfully, and the ItemId of the updated appointment.