/// <summary>
/// Reply to a meeting request. You can either reply to a meeting request received in your Inbox or
/// you can reply to the appointment in your calendar if the calendar item is automatically created
/// in your calendar folder. This sample identifies the different options for replying
/// to a meeting request.
/// </summary>
/// <param name="service">An ExchangeService object with credentials and the EWS URL.</param>
private static void RespondToMeetingInvite(ExchangeService service)
{
// Specify a view that returns a single item.
ItemView view = new ItemView(1);
bool replyToMeetingRequest = true; // Indicates whether you will act on the meeting request or the calendar item.
bool sendResponse = true;
//bool tentative = true;
//bool replyAll = true;
string querystringMeetingRequest = "Subject:'Status update - planning meeting' Kind:meetings";
string querystringAppointment = "Subject:'Status update - planning meeting'";
if (replyToMeetingRequest)
{
// Find the first meeting request in the Inbox with 'Status update - planning meeting' set for the subject property.
// This results in a FindItem operation call to EWS.
FindItemsResults <Item> results = service.FindItems(WellKnownFolderName.Inbox, querystringMeetingRequest, view);
if (results.TotalCount > 0)
{
if (results.Items[0] is MeetingRequest)
{
MeetingRequest request = results.Items[0] as MeetingRequest;
// Accept the meeting invitation. This results in a CreateItem operation call to EWS
// with the AcceptItem response object. If the Exchange server created a tentatively
// accepted calendar item for this request, Exchange will change the response value for the
// calendar item to accepted. Exchange will move the meeting request to the Deleted Items
// folder.
CalendarActionResults responseResults = request.Accept(sendResponse);
// The following are other options for responding to meeting requests:
// CalendarActionResults responseResults = request.AcceptTentatively(sendResponse);
// CalendarActionResults responseResults = request.Decline(sendResponse);
// The following options for responding to meeting requests create a local copy of the meeting response
// so that you can set properties on the response before sending the meeting response message
// to the organizer:
// CalendarActionResults responseResults = request.CreateAcceptMessage(tentative);
// CalendarActionResults responseResults = request.CreateDeclineMessage();
// The following options for acting on a meeting request change the item class of the response to an
// email message. This allows you to send an email response that does not affect the calendar workflow.
// You can update the ResponseMessage object properties and then use the ResponseMessage.Send
// method to send the email response.
// ResponseMessage response = request.CreateForward();
// ResponseMessage response = request.CreateReply(replyAll); // Creates a reply email message to all attendees.
// Get the appointment that was created in response to the accepted meeting request.
Appointment myAppointment = responseResults.Appointment;
// Gets the meeting request that was moved to the Deleted Items folder after the meeting request was
// used to make a response to the organizer. If the meeting request was responded to from
// the Deleted Items folder, the value of responseResults.MeetingRequest will be null.
if (responseResults.MeetingRequest != null)
{
MeetingRequest deletedRequest = responseResults.MeetingRequest;
}
// Gets a copy of the response sent to the organizer. If the attendee chose not to send a
// response, the value of responseResults.MeetingResponse will be null.
if (responseResults.MeetingResponse != null)
{
MeetingResponse meetingReponse = responseResults.MeetingResponse;
}
// Gets a copy of the meeting cancellation if the organizer canceled the meeting. This will
// be null if the organizer has not canceled the meeting.
if (responseResults.MeetingCancellation != null)
{
MeetingCancellation meetingCancel = responseResults.MeetingCancellation;
}
}
}
}
else // Find the automatically created calendar item in your calendar.
{
// Find the first appointment in the calendar with 'Status update - planning meeting' set for the subject property.
// This results in a FindItem operation call to EWS.
FindItemsResults <Item> results = service.FindItems(WellKnownFolderName.Calendar, querystringAppointment, view);
if (results.TotalCount > 0)
{
if (results.Items[0] is Appointment)
{
Appointment appointment = results.Items[0] as Appointment;
// Accept the calendar item. This results in a CreateItem operation call to EWS
// with the AcceptItem response object. Exchange will move the meeting
// request to the Deleted Items folder.
CalendarActionResults responseResults = appointment.Accept(sendResponse);
// The following are other options for responding to the meeting organizer:
// CalendarActionResults responseResults = appointment.AcceptTentatively(sendResponse);
// CalendarActionResults responseResults = appointment.Decline(sendResponse);
// CalendarActionResults responseResults = appointment.CreateAcceptMessage(tentative);
// CalendarActionResults responseResults = appointment.CreateDeclineMessage();
// appointment.Delete(DeleteMode.MoveToDeletedItems); // No response is sent to the organizer.
// ResponseMessage response = appointment.CreateForward();
// ResponseMessage response = appointment.CreateReply(replyAll);
// Gets the meeting request from the Deleted Items folder if it is present.
if (responseResults.MeetingRequest != null)
{
MeetingRequest deletedRequest = responseResults.MeetingRequest;
}
// Gets a copy of the response sent to the organizer. If the attendee chose not to send a
// response, the value of responseResults.MeetingResponse will be null.
if (responseResults.MeetingResponse != null)
{
MeetingResponse meetingReponse = responseResults.MeetingResponse;
}
// Gets a copy of the meeting cancellation if the organizer canceled the meeting. This will
// be null if the organizer has not canceled the meeting.
if (responseResults.MeetingCancellation != null)
{
MeetingCancellation meetingCancel = responseResults.MeetingCancellation;
}
}
}
}
}