从C＃发送附带附件的电子邮件，附件在Thunderbird中作为第1.2部分到达

8 回答

• 84

  使用附件发送电子邮件的简单代码 .

  来源：http://www.coding-issues.com/2012/11/sending-email-with-attachments-from-c.html

  using System.Net;
  using System.Net.Mail;
  
  public void email_send()
  {
      MailMessage mail = new MailMessage();
      SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");
      mail.From = new MailAddress("your mail@gmail.com");
      mail.To.Add("to_mail@gmail.com");
      mail.Subject = "Test Mail - 1";
      mail.Body = "mail with attachment";
  
      System.Net.Mail.Attachment attachment;
      attachment = new System.Net.Mail.Attachment("c:/textfile.txt");
      mail.Attachments.Add(attachment);
  
      SmtpServer.Port = 587;
      SmtpServer.Credentials = new System.Net.NetworkCredential("your mail@gmail.com", "your password");
      SmtpServer.EnableSsl = true;
  
      SmtpServer.Send(mail);
  
  }
  

  回复于 2024-04-28T01:16:32+08:00
• 1

  明确填写ContentDisposition字段就可以了 .

  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);                
  }
  

  BTW ，如果是Gmail，您可能会遇到一些关于ssl secure甚至端口的例外情况！

  smtpClient.EnableSsl = true;
  smtpClient.Port = 587;
  

  回复于 2024-04-28T01:16:32+08:00
• 6

  这是一个带附件的简单邮件发送代码

  try  
  {  
      SmtpClient mailServer = new SmtpClient("smtp.gmail.com", 587);  
      mailServer.EnableSsl = true;  
  
      mailServer.Credentials = new System.Net.NetworkCredential("myemail@gmail.com", "mypassword");  
  
      string from = "myemail@gmail.com";  
      string to = "reciever@gmail.com";  
      MailMessage msg = new MailMessage(from, to);  
      msg.Subject = "Enter the subject here";  
      msg.Body = "The message goes here.";
      msg.Attachments.Add(new Attachment("D:\\myfile.txt"));
      mailServer.Send(msg);  
  }  
  catch (Exception ex)  
  {  
      Console.WriteLine("Unable to send email. Error : " + ex);  
  }
  

  阅读更多Sending emails with attachment in C#

  回复于 2024-04-28T01:16:32+08:00
• 0

  完成Ranadheer的解决方案，使用 Server.MapPath 找到该文件

  System.Net.Mail.Attachment attachment;
  attachment = New System.Net.Mail.Attachment(Server.MapPath("~/App_Data/hello.pdf"));
  mail.Attachments.Add(attachment);
  

  回复于 2024-04-28T01:16:32+08:00
• 4

  private void btnSent_Click(object sender, EventArgs e)
  {
      try
      {
          MailMessage mail = new MailMessage();
          SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");
  
          mail.From = new MailAddress(txtAcc.Text);
          mail.To.Add(txtToAdd.Text);
          mail.Subject = txtSub.Text;
          mail.Body = txtContent.Text;
          System.Net.Mail.Attachment attachment;
          attachment = new System.Net.Mail.Attachment(txtAttachment.Text);
          mail.Attachments.Add(attachment);
  
          SmtpServer.Port = 587;
          SmtpServer.Credentials = new System.Net.NetworkCredential(txtAcc.Text, txtPassword.Text);
  
          SmtpServer.EnableSsl = true;
  
          SmtpServer.Send(mail);
          MessageBox.Show("mail send");
      }
      catch (Exception ex)
      {
          MessageBox.Show(ex.ToString());
      }
  }
  
  private void button1_Click(object sender, EventArgs e)
  {
      MailMessage mail = new MailMessage();
      openFileDialog1.ShowDialog();
      System.Net.Mail.Attachment attachment;
      attachment = new System.Net.Mail.Attachment(openFileDialog1.FileName);
      mail.Attachments.Add(attachment);
      txtAttachment.Text =Convert.ToString (openFileDialog1.FileName);
  }
  

  回复于 2024-04-28T01:16:32+08:00
• 0

  试试这个：

  private void btnAtt_Click(object sender, EventArgs e) {
  
      openFileDialog1.ShowDialog();
      Attachment myFile = new Attachment(openFileDialog1.FileName);
  
      MyMsg.Attachments.Add(myFile);
  
  
  }
  

  回复于 2024-04-28T01:16:32+08:00
• 0

  我尝试了Ranadheer Reddy（上图）提供的代码，效果很好 . 如果您使用的是具有受限服务器的公司计算机，则可能需要将SMTP端口更改为25并将用户名和密码留空，因为它们将由管理员自动填写 .

  最初，我尝试使用来自nugent包管理器的EASendMail，只是意识到它是30天试用版的付费 . 除非你打算买它，否则不要浪费时间 . 我注意到程序使用EASendMail运行得更快，但对我来说，免费快速 .

  只需2美分 .

  回复于 2024-04-28T01:16:32+08:00
• 82

  我已经制作了一个简短的代码，我希望与您分享 .

  这里的主要代码：

  public void Send(string from, string password, string to, string Message, string subject, string host, int port, string file)
  {
  
    MailMessage email = new MailMessage();
    email.From = new MailAddress(from);
    email.To.Add(to);
    email.Subject = subject;
    email.Body = Message;
    SmtpClient smtp = new SmtpClient(host, port);
    smtp.UseDefaultCredentials = false;
    NetworkCredential nc = new NetworkCredential(from, password);
    smtp.Credentials = nc;
    smtp.EnableSsl = true;
    email.IsBodyHtml = true;
    email.Priority = MailPriority.Normal;
    email.BodyEncoding = Encoding.UTF8;
  
    if (file.Length > 0)
    {
      Attachment attachment;
      attachment = new Attachment(file);
      email.Attachments.Add(attachment);
    }
  
    // smtp.Send(email);
    smtp.SendCompleted += new SendCompletedEventHandler(SendCompletedCallBack);
    string userstate = "sending ...";
    smtp.SendAsync(email, userstate);
  }
  
  private static void SendCompletedCallBack(object sender,AsyncCompletedEventArgs e) {
    string result = "";
    if (e.Cancelled)
    {    
      MessageBox.Show(string.Format("{0} send canceled.", e.UserState),"Message",MessageBoxButtons.OK,MessageBoxIcon.Information);
    }
    else if (e.Error != null)
    {
      MessageBox.Show(string.Format("{0} {1}", e.UserState, e.Error), "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
    }
    else {
      MessageBox.Show("your message is sended", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
    }
  
  }
  

  在你的按钮做这样的事情，你可以添加你的jpg或pdf文件等...这只是一个例子

  using (OpenFileDialog attachement = new OpenFileDialog()
  {
    Filter = "Exel Client|*.png",
    ValidateNames = true
  })
  {
  if (attachement.ShowDialog() == DialogResult.OK)
  {
    Send("yourmail@gmail.com", "gmail_password", 
         "tomail@gmail.com", "just smile ", "mail with attachement",
         "smtp.gmail.com", 587, attachement.FileName);
  
  }
  }
  

  回复于 2024-04-28T01:16:32+08:00