【C#】Smtp发送邮件

 1 class SmtpEmail
 2     {
 3         SmtpClient smtpclient;
 4         MailMessage msg;
 5         Attachment attachment;
 6         public void sendMail(String form, String[] to, String subject, String body, String attachmentpath)
 7         {
 8             if (to == null || to.Length <= 0) {
 9                 return;
10             }
11             try
12             {
13                 smtpclient = new SmtpClient("smtp.URL");
14                 smtpclient.UseDefaultCredentials = true;
15                 smtpclient.Credentials = new NetworkCredential("username", "*****");
16                 smtpclient.DeliveryMethod = SmtpDeliveryMethod.Network;
17                 msg = new MailMessage();
18                 
19 
20                 for (int i = 0; i < to.Length; i++)
21                 {
22                     msg.To.Add(to[i]);
23                 }
24                 if (msg.To.Count <= 0) {
25                     return;
26                 }
27                 msg.From = form;
28                 msg.Subject = subject;
29                 msg.Body = body;
30                 if (attachment!=null && !attachmentpath.Length.Equals(0))
31                 {
32                     this.attachment = new Attachment(attachmentpath);
33                     msg.Attachments.Add(attachment);
34                 }
35                 msg.BodyEncoding = Encoding.UTF8;
36                 msg.IsBodyHtml = true;
37                 smtpclient.Send(msg);
38             }
39             catch (Exception err)
40             {
41                 MessageBox.Show(err.Message);
42                 return;
43             }
44         }
45     }