使用 EWS for Exchange 2010 获取组织者的日历约会

Question

我有一个与 Exchange 2010 同步约会的同步应用程序，我有一些问题。

1. UserA 创建约会并将 UserB 添加为与会者，这意味着 UserA 是约会的组织者，并且 UserB 的 Outlook 日历将创建约会条目。
2. UserA 和 UserB 日历约会将有自己的 ID (UniqueID)。
3. 例如，如果我只获得了 UserB 的日历约会的 ID (UniqueID)，那么这是一种检索 UserA 的日历约会的方法吗？因为我认为它们应该是组织者和与会者预约之间的某种联系，我只是不知道如何。

Answer 1

对于任何追随我的人 - 以下是有关其工作原理的详细信息。我还将发布对我博客的引用以及源文件。

简而言之 - 约会使用 UID 属性绑定在一起。此属性也称为 CleanUniqueIdentifier。虽然此示例代码可以根据以下博客文章中引用的“错误”修复进行调整，但此源代码已完成，因为要求适用于 => 2007 SP1。

这假设您事先了解 EWS 是什么以及如何使用它 (EWS API)。这也是基于博文“EWS: UID not always the same for orphaned instances of the same meeting”和博文“Searching a meeting with a specific UID using Exchange Web Services 2007”

为此工作所需的设置：

1. 可以是“代表”或对各个帐户具有“模拟”权限的用户帐户。

问题：交换中的每个“约会”都有一个唯一的 id (Appointment.Id)，它是确切的实例标识符。有了这个 id，如何在日历中找到所有相关实例（重复或出席者请求）？

下面的代码概述了如何实现这一点。

[TestFixture]
public class BookAndFindRelatedAppoitnmentTest
{
  public const string ExchangeWebServiceUrl = "https://contoso.com/ews/Exchange.asmx";

  [Test]
  public void TestThatAppointmentsAreRelated()
  {
    ExchangeService service = GetExchangeService();

    //Impersonate the user who is creating the Appointment request
    service.ImpersonatedUserId = new ImpersonatedUserId( ConnectingIdType.PrincipalName, "Test1" );
    Appointment apptRequest = CreateAppointmentRequest( service, new Attendee( "Test2@contoso.com" ) );

    //After the appointment is created, we must rebind the data for the appointment in order to set the Unique Id
    apptRequest = Appointment.Bind( service, apptRequest.Id );

    //Impersonate the Attendee and locate the appointment on their calendar
    service.ImpersonatedUserId = new ImpersonatedUserId( ConnectingIdType.PrincipalName, "Test2" );
    //Sleep for a second to let the meeting request propogate YMMV so you may need to increase the sleep for this test
    System.Threading.Thread.Sleep( 1000 );
    Appointment relatedAppt = FindRelatedAppointment( service, apptRequest );

    Assert.AreNotEqual( apptRequest.Id, relatedAppt.Id );
    Assert.AreEqual( apptRequest.ICalUid, relatedAppt.ICalUid );
  }

  private static Appointment CreateAppointmentRequest( ExchangeService service, params Attendee[] attendees )
  {
    // Create the appointment.
    Appointment appointment = new Appointment( service )
    {
      // Set properties on the appointment.
      Subject = "Test Appointment",
      Body = "Testing Exchange Services and Appointment relationships.",
      Start = DateTime.Now,
      End = DateTime.Now.AddHours( 1 ),
      Location = "Your moms house",
    };

    //Add the attendess
    Array.ForEach( attendees, a => appointment.RequiredAttendees.Add( a ) );

    // Save the appointment and send out invites
    appointment.Save( SendInvitationsMode.SendToAllAndSaveCopy );

    return appointment;
  }

  /// <summary>
  /// Finds the related Appointment.
  /// </summary>
  /// <param name="service">The service.</param>
  /// <param name="apptRequest">The appt request.</param>
  /// <returns></returns>
  private static Appointment FindRelatedAppointment( ExchangeService service, Appointment apptRequest )
  {
    var filter = new SearchFilter.IsEqualTo
    {
      PropertyDefinition = new ExtendedPropertyDefinition
        ( DefaultExtendedPropertySet.Meeting, 0x03, MapiPropertyType.Binary ),
      Value = GetObjectIdStringFromUid( apptRequest.ICalUid ) //Hex value converted to byte and base64 encoded
    };

    var view = new ItemView( 1 ) { PropertySet = new PropertySet( BasePropertySet.FirstClassProperties ) };

    return service.FindItems( WellKnownFolderName.Calendar, filter, view ).Items[ 0 ] as Appointment;
  }

  /// <summary>
  /// Gets the exchange service.
  /// </summary>
  /// <returns></returns>
  private static ExchangeService GetExchangeService()
  {
    //You can use AutoDiscovery also but in my scenario, I have it turned off      
    return new ExchangeService( ExchangeVersion.Exchange2007_SP1 )
    {
      Credentials = new System.Net.NetworkCredential( "dan.test", "Password1" ),
      Url = new Uri( ExchangeWebServiceUrl )
    };
  }

  /// <summary>
  /// Gets the object id string from uid.
  /// <remarks>The UID is formatted as a hex-string and the GlobalObjectId is displayed as a Base64 string.</remarks>
  /// </summary>
  /// <param name="id">The uid.</param>
  /// <returns></returns>
  private static string GetObjectIdStringFromUid( string id )
  {
    var buffer = new byte[ id.Length / 2 ];
    for ( int i = 0; i < id.Length / 2; i++ )
    {
      var hexValue = byte.Parse( id.Substring( i * 2, 2 ), System.Globalization.NumberStyles.AllowHexSpecifier );
      buffer[ i ] = hexValue;
    }
    return Convert.ToBase64String( buffer );
  }
}