问在不打开桌面邮件软件或浏览器的情况下从.Net应用程序发送电子邮件(带附件)？

EN

using System.Net.Mail;

    /// <summary>
    /// Send an Email
    /// </summary>
    /// <param name="host">Example: smtp.gmail.com</param>
    /// <param name="port">Port to send email</param>
    /// <param name="from">Example: Email@gmail.com</param>
    /// <param name="password">Password</param>
    /// <param name="toList">List of people to send to</param>
    /// <param name="subject">Subject of email</param>
    /// <param name="messsage">Meddage of emial</param>
    /// <param name="deliveryMethod">Deliever type</param>
    /// <param name="isHtml">Is email HTML</param>
    /// <param name="useSSL">Is email SSL</param>
    /// <param name="ccList">List of people to cc</param>
    /// <param name="atachmentList">List of attachment files</param>
    public void SendMessage(string host, int port, string from, string password, List<string> toList, string subject, string messsage,
        SmtpDeliveryMethod deliveryMethod, bool isHtml, bool useSSL, List<string> ccList, List<string> atachmentList)
    {
        try
        {
            SmtpClient smtpClient = new SmtpClient(host);
            smtpClient.DeliveryMethod = deliveryMethod;
            smtpClient.Port = port;
            smtpClient.EnableSsl = useSSL;
            if (!string.IsNullOrEmpty(password))
                smtpClient.Credentials = new NetworkCredential(from, password);

            MailMessage mailMessage = new MailMessage();
            mailMessage.From = new MailAddress(from);
            mailMessage.Subject = subject;
            mailMessage.IsBodyHtml = isHtml;
            mailMessage.Body = messsage;

            if (toList != null)
            {
                for (int i = 0; i < toList.Count; i++)
                {
                    if (!string.IsNullOrEmpty(toList[i]))
                        mailMessage.To.Add(toList[i]);
                }
            }

            if (ccList != null)
            {
                for (int i = 0; i < ccList.Count; i++)
                {
                    if (!string.IsNullOrEmpty(ccList[i]))
                        mailMessage.CC.Add(ccList[i]);
                }
            }

            if (atachmentList != null)
            {
                for (int i = 0; i < atachmentList.Count; i++)
                {
                    if (!string.IsNullOrEmpty(atachmentList[i]))
                        mailMessage.Attachments.Add(new Attachment(atachmentList[i]));
                }
            }

            try
            {
                smtpClient.Send(mailMessage);
            }

            catch
            {
            }
        }
        catch
        {
        }
    }