[C#] 如何發出電郵

在send email 前, 先講如何制造email object. 這裡用了一粒class 去包著須要send的內容. 故砌真. object 時, 這個method 可以定義為adapter 的implementation.

 private MailMessage createMailMessage(EMAIL email)
        {
            MailMessage mail = new MailMessage()
             {
                 From = new MailAddress(email.FROM_EMAIL_ADDRESS),
             };
            mail.To.Add(new MailAddress(email.TO_EMAIL_ADDRESS));
            if (!string.IsNullOrEmpty(email.CC_EMAIL_ADDRESS))
                mail.CC.Add(new MailAddress(email.CC_EMAIL_ADDRESS));
            if (!string.IsNullOrEmpty(email.BCC_EMAIL_ADDRESS))
                mail.Bcc.Add(new MailAddress(email.BCC_EMAIL_ADDRESS));
            mail.Subject = email.SUBJECT;
            mail.Body = email.CONTENT;
            mail.BodyEncoding = Encoding.UTF8;
            mail.IsBodyHtml = true;

            // set priority.
            switch (email.PRIORITY)
            {
                case NotificationPriority.High:
                    mail.Priority = MailPriority.High;
                    break;
                case NotificationPriority.Normal:
                    mail.Priority = MailPriority.Normal;
                    break;
                case NotificationPriority.Low:
                    mail.Priority = MailPriority.Low;
                    break;
            }

            // Add attachment.
            if ((email.EMAIL_ATTACHMENT != null) && (email.EMAIL_ATTACHMENT.Count > 0))
            {
                foreach (EMAIL_ATTACHMENT emailAttachment in email.EMAIL_ATTACHMENT)
                {
                    mail.Attachments.Add(new Attachment(emailAttachment.ATTACHMENT_PATH));
                }
            }
            return mail;
        }

負責send mail 時, 則用了一個method call, 配合剛才介紹的method.

 public bool Send(EMAIL email)
        {
            bool result = false;
            try
            {
                using (SmtpClient smtpClient = new SmtpClient(smtpServer, smtpServerPortNo))
                {
                    if (enableAuthentication)
                    {
                        smtpClient.UseDefaultCredentials = enableAuthentication;
                        smtpClient.Credentials = new System.Net.NetworkCredential(smtpUserName, smtpUserpassword);
                    }
                    smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
                    smtpClient.EnableSsl = enableSsl;

                    

                    // Create email and set content.
                    smtpClient.Send(this.createMailMessage(email));
                }
                result = true;
            }
            catch (Exception ex)
            {
                throw(ex);
            }
            return result;
        }