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

    }