C# exchange server get meeting room appointment list

Question

I'm trying to work with EWS Managed API to get the meeting room list, and for each room to see the appointment list for a week.

I saw Get room lists by using EWS in Exchange And Get appointments and meetings by using EWS in Exchange

I've test the first link and I get 0 rooms.
Also for second link it gave the current user calendar but not meeting.

I need 3 things:

1) Get the meeting room list in my organization.
2) Get the meeting calendar for each room (for X days).
3) For each meeting, who organizes the meeting.

I cannot find the API for getting this information.

Answer 1

After a lot of searching and thanks to this post I found an answer to question #1 and #2

1) For getting all the meeting room in your organization:

 string filter = "(&(objectClass=*)(msExchRecipientDisplayType=7))";
 //Assembly System.DirectoryServices.dll
 DirectorySearcher search = new DirectorySearcher(filter);
 List<AttendeeInfo> rooms = new List<AttendeeInfo>();  
 foreach (SearchResult result in search.FindAll())
            {
                ResultPropertyCollection r = result.Properties;
                DirectoryEntry entry = result.GetDirectoryEntry();
                // entry.Properties["displayName"].Value.ToString() will bring the room name
                rooms.Add(new AttendeeInfo(entry.Properties["mail"].Value.ToString().Trim()));                 
            }

2) Get the meeting calendar for each room (for 2 days):

List<AttendeeInfo> attend = new List<AttendeeInfo>();
foreach (AttendeeInfo inf in rooms)
     {
       attend.Clear();
       attend.Add(inf.SmtpAddress);

       AvailabilityOptions options = new AvailabilityOptions();
       options.MaximumSuggestionsPerDay = 48;
       // service is ExchangeService object contains your authentication with exchange server
       GetUserAvailabilityResults results = service.GetUserAvailability(attend, new TimeWindow(DateTime.Now, DateTime.Now.AddDays(2)), AvailabilityData.FreeBusyAndSuggestions, options);

        foreach (AttendeeAvailability attendeeAvailability in results.AttendeesAvailability)
                {
                    Console.WriteLine();
                    Console.WriteLine();
                    if (attendeeAvailability.ErrorCode == ServiceError.NoError)
                    {
                        foreach (Microsoft.Exchange.WebServices.Data.CalendarEvent calendarEvent in
                        attendeeAvailability.CalendarEvents)
                        {
                            Console.WriteLine("Calendar event");
                            Console.WriteLine(" Starttime: " + calendarEvent.StartTime.ToString());
                            Console.WriteLine(" Endtime: " + calendarEvent.EndTime.ToString());
                            if (calendarEvent.Details != null)
                            {
                                Console.WriteLine(" Subject:" + calendarEvent.Details.Subject);

                            }
                        }
                    }
                }
            }

About question #3, it's not simple to get this information because it's private information and as regular user you don't have a permission to see it.