从C＃发送带有附件的电子邮件，附件作为Thunderbird的第1.2部分 [英] Sending email with attachments from C#, attachments arrive as Part 1.2 in Thunderbird

问题描述

我有一个C＃应用程序，通过使用SMTP的Exchange 2007服务器发送Excel电子表格报告。对于Outlook用户来说，这些都是正常的，但是对于Thunderbird和Blackberry用户，附件已被重命名为Part 1.2。

我发现这个文章，它描述了问题，但似乎没有给我一个解决方法。我没有Exchange服务器的控制权，所以不能在那里进行更改。在C＃结尾有什么可以做的吗？我已经尝试使用短文件名和HTML编码的身体，但没有区别。

我的邮件发送代码就是这样：

  public static void SendMail（string recipient，string subject，string body，string attachmentFilename）
 {
 SmtpClient smtpClient = new SmtpClient（）; 
 NetworkCredential basicCredential = new NetworkCredential（MailConst.Username，MailConst.Password）; 
 MailMessage message = new MailMessage（）; 
 MailAddress fromAddress = new MailAddress（MailConst.Username）; 
 
 //设置主机，将超时增加到5分钟
 smtpClient.Host = MailConst.SmtpServer; 
 smtpClient.UseDefaultCredentials = false; 
 smtpClient.Credentials = basicCredential; 
 smtpClient.Timeout =（60 * 5 * 1000）; 
 
 message.From = fromAddress; 
 message.Subject = subject; 
 message.IsBodyHtml = false; 
 message.Body = body; 
 message.To.Add（recipient）; 
 
 if（attachmentFilename！= null）
 message.Attachments.Add（new Attachment（attachmentFilename））; 
 
 smtpClient.Send（message）; 
} 
  

感谢任何帮助。

解决方案

明确填写ContentDisposition字段做的伎俩。

  if attachFilename！= null）
 {
附件附件=新附件（attachmentFilename，MediaTypeNames.Application.Octet）; 
 ContentDisposition disposition = attachment.ContentDisposition; 
 disposition.CreationDate = File.GetCreationTime（attachmentFilename）; 
 disposition.ModificationDate = File.GetLastWriteTime（attachmentFilename）; 
 disposition.ReadDate = File.GetLastAccessTime（attachmentFilename）; 
 disposition.FileName = Path.GetFileName（attachmentFilename）; 
 disposition.Size = new FileInfo（attachmentFilename）.Length; 
 disposition.DispositionType = DispositionTypeNames.Attachment; 
 message.Attachments.Add（attachment）; 
} 
  

I have a C# application which emails out Excel spreadsheet reports via an Exchange 2007 server using SMTP. These arrive fine for Outlook users, but for Thunderbird and Blackberry users the attachments have been renamed as "Part 1.2".

I found this article which describes the problem, but doesn't seem to give me a workaround. I don't have control of the Exchange server so can't make changes there. Is there anything I can do on the C# end? I have tried using short filenames and HTML encoding for the body but neither made a difference.

My mail sending code is simply this:

public static void SendMail(string recipient, string subject, string body, string attachmentFilename)
{
    SmtpClient smtpClient = new SmtpClient();
    NetworkCredential basicCredential = new NetworkCredential(MailConst.Username, MailConst.Password);
    MailMessage message = new MailMessage();
    MailAddress fromAddress = new MailAddress(MailConst.Username);

    // setup up the host, increase the timeout to 5 minutes
    smtpClient.Host = MailConst.SmtpServer;
    smtpClient.UseDefaultCredentials = false;
    smtpClient.Credentials = basicCredential;
    smtpClient.Timeout = (60 * 5 * 1000);

    message.From = fromAddress;
    message.Subject = subject;
    message.IsBodyHtml = false;
    message.Body = body;
    message.To.Add(recipient);

    if (attachmentFilename != null)
        message.Attachments.Add(new Attachment(attachmentFilename));

    smtpClient.Send(message);
}

Thanks for any help.

解决方案

Explicitly filling in the ContentDisposition fields did the trick.

if (attachmentFilename != null)
{
    Attachment attachment = new Attachment(attachmentFilename, MediaTypeNames.Application.Octet);
    ContentDisposition disposition = attachment.ContentDisposition;
    disposition.CreationDate = File.GetCreationTime(attachmentFilename);
    disposition.ModificationDate = File.GetLastWriteTime(attachmentFilename);
    disposition.ReadDate = File.GetLastAccessTime(attachmentFilename);
    disposition.FileName = Path.GetFileName(attachmentFilename);
    disposition.Size = new FileInfo(attachmentFilename).Length;
    disposition.DispositionType = DispositionTypeNames.Attachment;
    message.Attachments.Add(attachment);                
}

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