一个关于发邮件的类，可以模拟发送对smtp服务器或者是本地文件夹

 1 namespace SportsStore.Domain.Concrete {
 2 
 3     public class EmailSettings {
 4         public string MailToAddress = "orders@example.com";
 5         public string MailFromAddress = "sportsstore@example.com";
 6         public bool UseSsl = true;
 7         public string Username = "MySmtpUsername";//MailToAddress一样
 8         public string Password = "MySmtpPassword";
 9         public string ServerName = "smtp.example.com";
10         public int ServerPort = 587;//Gmail为587,其他一般为25 
11         public bool WriteAsFile = false;//设为false邮件将发送到路径FileLoacation
12         public string FileLocation = @"c:sports_store_emails";
13     }
14 
15     public class EmailOrderProcessor :IOrderProcessor {
16         private EmailSettings emailSettings;
17 
18         public EmailOrderProcessor(EmailSettings settings) {
19             emailSettings = settings;
20         }
21 
22         public void ProcessOrder(Cart cart, ShippingDetails shippingInfo) {
23 
24             using (var smtpClient = new SmtpClient()) {
25 
26                 smtpClient.EnableSsl = emailSettings.UseSsl;
27                 smtpClient.Host = emailSettings.ServerName;
28                 smtpClient.Port = emailSettings.ServerPort;
29                 smtpClient.UseDefaultCredentials = false;
30                 smtpClient.Credentials 
31                     = new NetworkCredential(emailSettings.Username, emailSettings.Password);
32                 if (emailSettings.WriteAsFile) {
33                     smtpClient.DeliveryMethod = SmtpDeliveryMethod.SpecifiedPickupDirectory;
34                     smtpClient.PickupDirectoryLocation = emailSettings.FileLocation;
35                     smtpClient.EnableSsl = false;
36                 }
37 
38                 StringBuilder body = new StringBuilder()
39                 .AppendLine("A new order has been submitted")
40                 .AppendLine("---")
41                 .AppendLine("Items:");
42 
43                 foreach (var line in cart.Lines) {
44                     var subtotal = line.Product.Price * line.Quantity;
45                     body.AppendFormat("{0} x {1} (subtotal: {2:c}", line.Quantity,
46                                       line.Product.Name,
47                                       subtotal);
48                 }
49                 body.AppendFormat("Total order value: {0:c}", cart.ComputeTotalValue())
50                 .AppendLine("---")
51                 .AppendLine("Ship to:")
52                 .AppendLine(shippingInfo.Name)
53                 .AppendLine(shippingInfo.Line1)
54                 .AppendLine(shippingInfo.Line2 ?? "")
55                 .AppendLine(shippingInfo.Line3 ?? "")
56                 .AppendLine(shippingInfo.City)
57                 .AppendLine(shippingInfo.State ?? "")
58                 .AppendLine(shippingInfo.Country)
59                 .AppendLine(shippingInfo.Zip)
60                 .AppendLine("---")
61                 .AppendFormat("Gift wrap: {0}", shippingInfo.GiftWrap ? "Yes" : "No");
62 
63                 MailMessage mailMessage = new MailMessage(
64                                        emailSettings.MailFromAddress,   // From
65                                        emailSettings.MailToAddress,     // To
66                                        "New order submitted!",          // Subject
67                                        body.ToString());                // Body
68 
69                 if (emailSettings.WriteAsFile) {
70                     mailMessage.BodyEncoding = Encoding.ASCII;
71                 }
72 
73                 smtpClient.Send(mailMessage);
74             }
75         }
76     }
77 }
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