c# – Microsoft.Exchange.WebServices.Data.ServiceValidationException:属性RequiredAttendees不能在FindItem请求中使用

我正在访问EWS日历中的约会与会者.我试过了:

cView.PropertySet = new PropertySet(AppointmentSchema.Subject,
                    AppointmentSchema.Start,
                    AppointmentSchema.End);

但我的约会列表条目每个都返回null必需/可选参加者字段,即使多个用户已接受测试约会.我的假设是PropertySet需要包含更多的ApplicationSchema属性,如下所示:

cView.PropertySet = new PropertySet(AppointmentSchema.Subject,
                AppointmentSchema.Start,
                AppointmentSchema.End,
                AppointmentSchema.RequiredAttendees,
                AppointmentSchema.OptionalAttendees);

但是,这会在calendar.FindAppointments(cView)上引发以下ServiceValidationException错误:

Microsoft.Exchange.WebServices.Data.ServiceValidationException: The property RequiredAttendees can’t be used in FindItem requests.

如何解决此问题,以便约会包括必需/可选的与会者?

ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2007_SP1);

service.Credentials = new WebCredentials(emailAddress, emailPassword);        

// Initialize values for the start and end times, and the number of appointments to retrieve.
DateTime startDate = DateTime.Now;
DateTime endDate = startDate.AddYears(1);
const int NUM_APPTS = 4;

// Initialize the calendar folder object with only the folder ID. 
CalendarFolder calendar = CalendarFolder.Bind(service, WellKnownFolderName.Calendar, new PropertySet());

// Set the start and end time and number of appointments to retrieve.
CalendarView cView = new CalendarView(startDate, endDate, NUM_APPTS);

// Limit the properties returned to the appointment's subject, start time, and end time.
cView.PropertySet = new PropertySet(AppointmentSchema.Subject,
     AppointmentSchema.Start,
     AppointmentSchema.End,
     AppointmentSchema.RequiredAttendees,
     AppointmentSchema.OptionalAttendees);

// Retrieve a collection of appointments by using the calendar view.
FindItemsResults<Appointment> appointments = calendar.FindAppointments(cView);
最佳答案
收件人是属性之一以及未通过FindItems操作返回的正文,您需要使用GetItem请求获取这些属性,请参阅https://msdn.microsoft.com/en-us/library/bb508824.aspxhttps://blogs.msdn.microsoft.com/exchangedev/2010/03/16/loading-properties-for-multiple-items-with-one-call-to-exchange-web-services/

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