使用Outlook EWS获取会议及会议室信息

1、建立连接：

//与exchange web服务器建立连接
ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010);
ExchangeCredentials credentials = new WebCredentials([邮箱账号], [密码]);
service.Credentials = credentials;
//这个url可能每个公司不一样，大多数是这个
service.Url = new Uri("https://outlook.[域名].com/ews/exchange.asmx");
service.TraceEnabled = true;

2、获取会议列表：

//Initialize values for the start and end times, and the number of appointments to retrieve.
DateTime startDate = DateTime.Now.AddDays(-1).Date.AddSeconds(1).AddDays(1);
DateTime endDate = startDate.AddDays(1);
const int NUM_APPTS = 5;
// 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.Location, AppointmentSchema.Organizer);
// Retrieve a collection of appointments by using the calendar view.
FindItemsResults<Appointment> appointments = calendar.FindAppointments(cView);
Console.WriteLine("\nThe first " + NUM_APPTS + " appointments on your calendar from " + startDate.Date.ToShortDateString() +
                              " to " + endDate.Date.ToShortDateString() + " are: \n");

foreach (Appointment a in appointments)
{
　　Console.Write("Subject: " + a.Subject.ToString() + " ");
　　Console.Write("Start: " + a.Start.ToString() + " ");
　　Console.Write("End: " + a.End.ToString());
　　if (a.Location != null)
　　{
　　　　Console.Write("End: " + a.Location.ToString());
　　}
　　Console.WriteLine();
}

3、获取会议室列表：

try
{
　　// 这里先获取大的会议室列表，大多数是按区域分的，不如公司有五个办公地点，这里获取的就是各个办公地点的address
　　EmailAddressCollection myRoomLists = service.GetRoomLists();
　　List<String> addList = new List<String>();
　　foreach (EmailAddress address in myRoomLists)
　　{
　　　　EmailAddress emailAddress = new EmailAddress(address.Address);
　　　　// 根据各个办公地点的address，再获取具体的所有会议室信息
　　　　// 如获取北京办公地的所有会议室信息
　　　　Collection<EmailAddress> list = service.GetRooms(emailAddress);
　　　　foreach (EmailAddress e in list)
　　　　{
　　　　　　string aa = e.Address;
　　　　　　string bb = e.Name;
　　　　}
　　}
}
catch (Exception e1)
{
　　// TODO Auto-generated catch block
　　//e1.printStackTrace();
}

4、获取会议室事件：

//读取会议室预定情况
List<AttendeeInfo> attendees = new List<AttendeeInfo>();
attendees.Add(new AttendeeInfo("[会议室邮箱地址]", MeetingAttendeeType.Room, true));
GetUserAvailabilityResults results = service.GetUserAvailability(attendees,
// 设置当天时间
new TimeWindow(DateTime.Now.AddDays(-3).Date, DateTime.Now.AddDays(1).Date), AvailabilityData.FreeBusyAndSuggestions);

List<Hashtable> htList = new List<Hashtable>();

foreach (AttendeeAvailability availability in results.AttendeesAvailability)
{
　　foreach (CalendarEvent calEvent in availability.CalendarEvents)
　　{
　　　　Hashtable ht = new Hashtable();
　　　　// 开始时间和结束时间
　　　　ht.Add("start", calEvent.StartTime);
　　　　ht.Add("end", calEvent.EndTime);
　　　　CalendarEventDetails details = calEvent.Details;

　　　　if (details != null)
　　　　{
　　　　　　ht.Add("subject", details.Subject);
　　　　}

　　　　htList.Add(ht);
　　}
}

 5、获取会议室日历：

CalendarView testCView = new CalendarView(calEvent.StartTime, calEvent.EndTime);
FolderId folderId = new FolderId(WellKnownFolderName.Calendar, new Mailbox("[会议室邮箱列表]"));
FindItemsResults<Appointment> findResults = null;
try
{
　　findResults = service.FindAppointments(folderId, testCView);
　　List<Appointment> appointmentItems = findResults.Items.ToList();

　　foreach (Appointment ap in appointmentItems)
　　{
　　　　string name = ap.Organizer.Name;
　　　　string address = ap.Organizer.Address;
　　}
}
catch (Exception e)
{

}

6、默认返回的Organizer.Address格式为：

/o=[域名]/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=a272ba5365f94925982d3b1a3117444d-[域账号]

如果要显示邮箱地址，需要重新加载Organizer.Address属性值：

//Calendar View
CalendarView testCView = new CalendarView(calEvent.StartTime, calEvent.EndTime);
FolderId folderId = new FolderId(WellKnownFolderName.Calendar, new Mailbox("[会议室邮箱地址]"));
FindItemsResults<Appointment> findResults = null;
try
{
　　findResults = service.FindAppointments(folderId, testCView);

　　PropertySet propertySet = new PropertySet(BasePropertySet.FirstClassProperties);
　　propertySet.RequestedBodyType = BodyType.Text;
　　service.LoadPropertiesForItems(from Item item in findResults select item, propertySet);

　　List<Appointment> appointmentItems = findResults.Items.ToList();

　　foreach (Appointment ap in appointmentItems)
　　{
　　　　string name = ap.Organizer.Name;
　　　　string address = ap.Organizer.Address;
　　}
}
catch (Exception e)
{

}

 BTW，返回的会议主题可能会变成组织者姓名，与会议室的配置有关系，通过PowerShell命令修改即可，已验证成功。

Set-CalendarProcessing -Identity [会议室域账号] -AddOrganizerToSubject $false -DeleteSubject $false

参考文档：

https://stackoverflow.com/questions/24446558/when-retrieving-an-appointment-with-ews-the-subject-contains-the-organizer-name

https://www.slipstick.com/exchange/cmdlets/meeting-organizers-name-appears-in-subject-line/

https://docs.microsoft.com/en-us/powershell/module/exchange/set-calendarprocessing?view=exchange-ps