EWS - 未随邀请发送的附件答案

【问题标题】：EWS - Attachment Not Sent With InvitationEWS - 未随邀请发送的附件
【发布时间】：2012-07-10 16:54:29
【问题描述】：

我在使用 EWS 托管 API 发送带有邀请的附件时遇到问题。约会与会者没有收到添加到约会中的任何附件，但附件确实出现在创建约会的人的日历中。

这是我的代码 sn-p：

try
{
    ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010_SP1, TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time"));
    service.Credentials = new WebCredentials("calendar_user", "password1", "acme");
    service.Url = new Uri("https://acme.com/EWS/Exchange.asmx");

    Appointment appointment = new Appointment(service);
    service.ImpersonatedUserId = new ImpersonatedUserId(ConnectingIdType.SmtpAddress, "tin.tin@acme.com");

    String UID = "D09F3FF6-1461-414C-89E8-C05BC3B66A4A";
    appointment.ICalUid = UID;
    appointment.Subject = "Test Subject";
    appointment.Body = "Test Content.";
    appointment.Start = new DateTime(2012, 07, 11, 17, 00, 0);
    appointment.End = appointment.Start.AddMinutes(30);

    FileAttachment attachment = appointment.Attachments.AddFileAttachment(@"C:\Users\tintin\Documents\Test.xlsx");
    attachment.IsInline = false;

    appointment.RequiredAttendees.Add("tin.tin@acme.com");

    appointment.Save(SendInvitationsMode.SendToAllAndSaveCopy);
}
catch (Exception ex)
{

}

【问题讨论】：

标签： exchangewebservices ews-managed-api appointment

【解决方案1】：

看起来 EWS 在附件处理方面存在可怕的限制。我找到了解决此问题的解决方法，该问题需要更新约会对象两次。

appointment.ICalUid = UID;
appointment.Subject = "Test Subject";
appointment.Body = "Test Content.";
appointment.Start = new DateTime(2012, 07, 11, 17, 00, 0);
appointment.End = appointment.Start.AddMinutes(30);

FileAttachment attachment = appointment.Attachments.AddFileAttachment(@"C:\Users\tintin\Documents\Test.xlsx");
attachment.IsInline = false;

appointment.Save(folderCalendar, SendInvitationsMode.SendToNone);
appointment.RequiredAttendees.Add("tin.tin@acme.com");

appointment.Update(ConflictResolutionMode.AutoResolve, SendInvitationsOrCancellationsMode.SendToAllAndSaveCopy);

【讨论】：

【解决方案2】：

看起来这个问题是 Exchange Server 2010 Service Pack 1 特有的。我遇到了类似的问题，当我将版本更改为 SP2 时，问题得到了解决。下面的代码解决了问题

ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010_SP2);

【讨论】：

【解决方案3】：

第二次更新成功了，但它会导致底部的会议被取消。不能在产品中使用。将版本更改为 SP2 不起作用。

仍在寻找更好的解决方案。

【讨论】：

【解决方案4】：

是的，EWS 有一些问题，在使用新附件更新会议时，它不是第一次更新。需要 2 个实例来更新它。

Microsoft.Exchange.WebServices.Data.Appointment meet1 = await 
Microsoft.Exchange.WebServices.Data.Appointment.Bind(service, strMessageID);
                                meet1.Attachments.Clear();
                                foreach (FileUpload Item in 
objCreateEvent.strAttachmentUploadPath)
                                {
                                    meet1.Attachments.AddFileAttachment(Item.fileName, 
Item.filePath);
                                }
                                meet1.RequiredAttendees.Clear();
                                foreach (string ToItem in objToIds)
                                {
                                    meet1.RequiredAttendees.Add(ToItem);
                                }
                                await 
meet1.Update(ConflictResolutionMode.AlwaysOverwrite, 
SendInvitationsOrCancellationsMode.SendToAllAndSaveCopy);
                                Microsoft.Exchange.WebServices.Data.Appointment 
meeting2 = await Microsoft.Exchange.WebServices.Data.Appointment.Bind(service, 
strMessageID);
                                meeting2.Attachments.Clear();
                                foreach (FileUpload Item in 
objCreateEvent.strAttachmentUploadPath)
                                {
                                    
meeting2.Attachments.AddFileAttachment(Item.fileName, Item.filePath);
                                }
                                meeting2.RequiredAttendees.Clear();
                                foreach (string ToItem in objToIds)
                                {
                                    meeting2.RequiredAttendees.Add(ToItem);
                                }
                                await 
meeting2.Update(ConflictResolutionMode.AlwaysOverwrite, 
SendInvitationsOrCancellationsMode.SendToAllAndSaveCopy);

【讨论】：