使用EWS for Exchange 2010获取组织者的日历约会 [英] Get the organizer's calendar appointment using EWS for Exchange 2010

问题描述

我有一个与Exchange 2010进行同步约会的同步应用程序，并且我有一些疑问.

I have an synchronization application with sync appointments with Exchange 2010, and i have some questions.

1. UserA创建一个约会并将UserB添加为与会者，这意味着UserA是约会的组织者，并且UserB前景日历将创建一个约会条目.
2. UserA和UserB日历约会将具有其自己的ID(UniqueID).
3. 例如，如果我仅获得UserB日历约会的ID(UniqueID)，那是检索UserA日历约会的一种方法吗?因为我认为它们应该是组织者与与会者约会之间的某种联系，所以我只是不知道该怎么做.

推荐答案

对于跟随我的任何人-以下是有关其工作原理的详细信息.我还将使用源文件发布对博客的引用.

For anyone coming after me - here is the details on how this works. I'll also post reference to my blog with source files.

简而言之-约会使用UID属性绑定在一起.此属性也称为CleanUniqueIdentifier.虽然可以根据下面博客文章中引用的错误"修复程序来调整此示例代码，但完成此源代码是因为要求是与=> 2007 SP1一起使用.

In short - appointments are tied together using the UID property. This property is also termed as the CleanUniqueIdentifier. While this example code could be adjusted based on a "bug" fix referenced in the blog post below, this source code is done because the requirements are to work with => 2007 SP1.

这假定您具有EWS是什么以及如何使用它的一些先验知识(

This assumes you have some prior knowledge of what the EWS is and how to use it (EWS API). This also is building off of blog post "EWS: UID not always the same for orphaned instances of the same meeting" and post "Searching a meeting with a specific UID using Exchange Web Services 2007"

要使其正常运行，必须进行以下设置:

Required setup for this to work:

1. 各个帐户可以是代理"或具有模拟"特权的用户帐户.

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(重复请求或与会者请求)?

Problem: Each "appointment" in exchange has a unique id (Appointment.Id) that is the exact instance identifier. Having this id, how can one find all related instances (recurring or attendee requests) in a calendar?

下面的代码概述了如何实现此目的.

The code below outlines how this can be accomplished.

[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( "[e-mail]" ) );

    //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 );
  }
}

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