C#異步發送Email代碼

異步發送電子郵件代碼

/// <summary>
        /// 異步發送電子郵件
        /// </summary>
        /// <param name="fromEmail">發送方電子郵件</param>
        /// <param name="fromPwd">發送方電子郵件密碼</param>
        /// <param name="toEmail">接收方電子郵件</param>
        /// <param name="subject">郵件標題</param>
        /// <param name="body">郵件內空</param>
        /// <param name="emailType">郵件類型</param> smtp.163.com.cn; smtp.qq.com.cn; smtp.126.com.cn;  smtp.sina.com.cn
        private void SendEmailAsync(string fromEmail, string fromPwd, string toEmail, string subject, string body, string emailType)
        {
            MailAddress addrFrom = new MailAddress(fromEmail, fromEmail);
            MailAddress addrTo = new MailAddress(toEmail, toEmail);
            MailMessage mm = new MailMessage(addrFrom, addrTo);
            mm.BodyEncoding = Encoding.UTF8;
            mm.IsBodyHtml = true;
            mm.Subject = subject;
            mm.Body = body;


        if (!string.IsNullOrEmpty(attFile))
        {
            Attachment att = new Attachment(attFile, MediaTypeNames.Application.Octet);
            ContentDisposition cd = att.ContentDisposition;
            cd.CreationDate = File.GetCreationTime(attFile);
            cd.ModificationDate = File.GetLastWriteTime(attFile);
            cd.ReadDate = File.GetLastAccessTime(attFile);
            mm.Attachments.Add(att);//添加附件
        }

        NetworkCredential nc = new NetworkCredential(fromEmail, fromPwd);
        SmtpClient smtp = new SmtpClient(emailType);
        smtp.UseDefaultCredentials = false;
        smtp.Credentials = nc;
        smtp.EnableSsl = false;
        smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
        smtp.SendCompleted+=new SendCompletedEventHandler(smtp_SendCompleted);
        smtp.SendAsync(mm, "OK");
    }

    void smtp_SendCompleted(object sender, AsyncCompletedEventArgs e)
    {
        if (e.UserState.ToString() == "OK")
            MessageBox.Show("發送成功!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
    }</pre>