如何在发送前重命名文件

Question

我正在使用带有 c# 的 Mailkit 来发送带有附件的电子邮件。

如何在发送邮件前重命名附件？

我目前正在使用下面的代码，但在 IIS 中部署时会引发错误。

                var username = "username";
                var password = "password";
                var displayname = "display";

                var from = new MailboxAddress(displayname, username);
                var to = new MailboxAddress("User", emailto);

                msg.From.Add(from);
                msg.To.Add(to);

                msg.Subject = emailsubject;

                var attachment = new MimePart("application","zip")
                {
                    Content = new MimeContent(File.OpenRead(Path.Combine(fileutil.GetDir, "originalname.zip"))),
                    ContentDisposition = new ContentDisposition(ContentDisposition.Attachment),
                    ContentTransferEncoding = ContentEncoding.Base64,
                    FileName = "new filename.zip"
                };

                var msgbody = new BodyBuilder
                {
                    HtmlBody = string.Format(@"Message"),
                    TextBody = "Test Message!"
                };

                msgbody.Attachments.Add(attachment);
                msg.Body = msgbody.ToMessageBody();

                var client = new SmtpClient();
                client.Connect("smtp-mail.outlook.com", 587, SecureSocketOptions.StartTls);
                client.Authenticate(username, password);

                client.Send(msg);
                client.Disconnect(true);
                client.Dispose();

编辑：经过一番挖掘，我发现这是抛出的异常

The server's SSL certificate could not be validated for the following reasons:
• The server certificate has the following errors:
  • The revocation function was unable to check revocation for the certificate.
  • The revocation function was unable to check revocation because the revocation server was offline.
• An intermediate certificate has the following errors:
  • The revocation function was unable to check revocation for the certificate.
  • The revocation function was unable to check revocation because the revocation server was offline.```

Answer 1

试试这个：

var client = new SmtpClient();
client.ServerCertificateValidationCallback = (o, c, ch, e) => true;
client.Connect("smtp-mail.outlook.com", 587, SecureSocketOptions.StartTls);
client.Authenticate(username, password);