Question

我正在尝试使用以下代码使用C＃和Exchange Web服务从收件箱中的电子邮件连接和下载附件，但我收到'System.ArgumentOutOfRangeException'错误，我不明白为什么。我已经google了一个答案，但我找不到一个或我找到的答案是非常旧版本的EWS。

我知道其他代码通常有效，因为我可以访问与电子邮件相关的其他信息，而不是访问附件。

任何人都会向我展示我的方式错误吗？

提前致谢，

詹姆斯

    static void Main(string[] args)
    {
        ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2007_SP1);
        service.Credentials = new NetworkCredential("MYLOGIN", "MYPASSWORD", "MYDOMAIN");

        service.Url = new Uri("https://MYMAILSERVER/EWS/Exchange.asmx");

        ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };

        FindItemsResults<Item> findResults = service.FindItems(WellKnownFolderName.Inbox, new ItemView(1000));

        foreach (Item item in findResults.Items)
        {
            if (item.HasAttachments && item.Attachments[0] is FileAttachment)
            {
                FileAttachment fileAttachment = item.Attachments[0] as FileAttachment;
                fileAttachment.Load("C:\\temp\\" + fileAttachment.Name);
            }

        }
    }
}

已解决但新问题

我现在通过将'foreach（findResults.Items中的项目项）更改为'foreach（findResults.Items中的EmailMessage项）'来排序问题，但现在我需要了解如何通过附件进行枚举 - 任何任何人的想法？

Answer 1

检查您的个人资料。如果您在轻型模式下运行，则不会使用消息下载附件。

添加以下行

item.Load() // loads the entire message with attachment

Answer 2

您的新问题的答案是

    ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2007_SP1);

    //service.Credentials = new NetworkCredential( "{Active Directory ID}", "{Password}", "{Domain Name}" );

    service.AutodiscoverUrl("firstname.lastname@MyCompany.com");

        FindItemsResults<Item> findResults = service.FindItems(
           WellKnownFolderName.Inbox,
           new ItemView(10));

        foreach (Item item in findResults.Items)
        {
            Console.WriteLine(item.Subject);
            item.Load();
            if(item.HasAttachments)
            {
                foreach (var i in item.Attachments)
                {
                    FileAttachment fileAttachment = i as FileAttachment;
                    fileAttachment.Load();
                    Console.WriteLine("FileName: " + fileAttachment.Name);

                }
            }

        }

Answer 3

除非我遗漏了一些显而易见的事情，否则您只需通过item.Attachments枚举。

点击here，然后向下滚动到您看到Example标题的位置。

Answer 4

从指定数量的电子邮件下载所有附件的解决方案：

  ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2013);
  service.Credentials = new NetworkCredential("login", "password");

  service.Url = new Uri("https://mail.Yourservername.com/EWS/Exchange.asmx");

  ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };

  FindItemsResults<Item> findResults = service.FindItems(WellKnownFolderName.Inbox, new ItemView(10));

  if (findResults != null && findResults.Items != null && findResults.Items.Count > 0)
      foreach (EmailMessage item in findResults)
       {
         EmailMessage message = EmailMessage.Bind(service, item.Id, new PropertySet(BasePropertySet.IdOnly, ItemSchema.Attachments, ItemSchema.HasAttachments));
           foreach (Attachment attachment in message.Attachment
             {
               if (attachment is FileAttachment)
                  {
                    FileAttachment fileAttachment = attachment as FileAttachment;      
                    fileAttachment.Load(@"Folder\file.name");
                   }
             }
        }

不要忘记将正确版本的Exchange Server传递给ExchangeService构造函数。

Answer 5

这是一种可用于下载附件的GetAttachmentsFromEmail方法。

public static void GetAttachmentsFromEmail(ExchangeService service, ItemId itemId)
    {
        // Bind to an existing message item and retrieve the attachments collection.
        // This method results in an GetItem call to EWS.
        EmailMessage message = EmailMessage.Bind(service, itemId, new PropertySet(ItemSchema.Attachments));

        // Iterate through the attachments collection and load each attachment.
        foreach (Attachment attachment in message.Attachments)
        {
            if (attachment is FileAttachment)
            {
                FileAttachment fileAttachment = attachment as FileAttachment;

                // Load the attachment into a file.
                // This call results in a GetAttachment call to EWS.
                fileAttachment.Load("C:\\temp\\" + fileAttachment.Name);

                Console.WriteLine("File attachment name: " + fileAttachment.Name);
            }
            else // Attachment is an item attachment.
            {
                ItemAttachment itemAttachment = attachment as ItemAttachment;

                // Load attachment into memory and write out the subject.
                // This does not save the file like it does with a file attachment.
                // This call results in a GetAttachment call to EWS.
                itemAttachment.Load();

                Console.WriteLine("Item attachment name: " + itemAttachment.Name);
            }
        }
    }

使用Exchange Web服务从Exchange下载附件

5 个答案: