20210216_SendOrderEmail_withoutRazor.cs

[HttpPost]
public ActionResult SendOrderEmail()
{
  var order = Models.OrderUtil.GetTestOrder();

  string subject = "測試主旨";

  string body = $@"訂單編號：{order.order_id}<br>
                   顧客E-mail：{order.customer_email}<br>
                   訂單明細：";

  body += @"<table border=""1"" cellpadding=""5"">
            <tr>
              <th>產品</th>
              <th>數量</th>
            </tr>";

  foreach (var detail in order.details)
  {
    body += $@"<tr>
                 <td>{detail.product_name}</td>
                 <td>{detail.quantity}</td>
               </tr>";
  }

  body += "</table>";

  using (SmtpClient smtp = new SmtpClient("your.smtp.server"))
  {
    smtp.Send(new MailMessage("noreply@jzcorp.com", order.customer_email)
    {
      Subject = subject,
      Body = body,
      IsBodyHtml = true
    });
  }

  return View("MailSent");
}