SMTP 发邮件

    public class EmailOrderProcessor :IOrderProcessor
    {
        private EmailSettings es;

        public EmailOrderProcessor(EmailSettings settings)
        {
            es = settings;
        }

        public void ProcessOrder(Cart cart,ShippingDetails shippingInfo)
        {
            using (var smtpClient = new SmtpClient())
            {
                smtpClient.EnableSsl = true;
                smtpClient.Host = es.ServerName;        //服务器地址
                smtpClient.Port = es.ServerPort;        //端口号
                smtpClient.UseDefaultCredentials = false;
                smtpClient.Credentials = new NetworkCredential(es.Username, es.Password);       //设置用于验证发件人身份的凭证

                //声明一个可变字符串变量 body，用来存储邮件内容
                StringBuilder body = new StringBuilder().AppendLine("您有新的订单，请注意查收")
                    .AppendLine("------")
                    .AppendLine("订单信息：");

                foreach(var line in cart.Lines)
                {
                    var subtotal = line.Product.Price * line.Quantity;
                    body.AppendFormat("{0} x {1} (总价：{2:c})", line.Quantity, line.Product.Name, subtotal);
                }

                body.AppendFormat("合计：{0:c}", cart.ComputeTotalValue())
                    .AppendLine("------")
                    .AppendLine("送到：")
                    .AppendLine(shippingInfo.Name)
                    .AppendLine(shippingInfo.Line1)
                    .AppendLine(shippingInfo.Line2 ?? " ")
                    .AppendLine(shippingInfo.Line3 ?? "")
                    .AppendLine(shippingInfo.Province + "  ")
                    .Append(shippingInfo.City)
                    .AppendLine(shippingInfo.Zip)
                    .AppendLine("------")
                    .AppendFormat("包装：{0}", shippingInfo.GiftWrap ? "需要" : "不需要");

                //发件人，收件人，邮件标题，邮件内容
                MailMessage mailMessage = new MailMessage(es.MailFromAddress, es.MailToAddress, "新的订单", body.ToString());
                //发送邮件
                smtpClient.Send(mailMessage);
            }
        }
    }

    public class EmailSettings
    {
        public string MailToAddress = "11478@qq.com";       //收件箱（这里因为是给管理员发，所以是固定的）
        public string MailFromAddress = "sportsstore@example.com";      //发件箱

        public string Username = "MySmtpUsername";          //账户名
        public string Password = "MySmtpPassword";          //密码（授权码）
        public string ServerName = "smtp.example.com";      //SMTP服务器地址
        public int ServerPort = ;                        //服务器端口号
    }