.Net实现简单的邮件发送

使用winform写了一个小程序,实现简单的邮件发送功能,部分代码如下:

//异步发送邮件:

 1 //发送按钮
 2 private void btn_Send_Click(object sender, EventArgs e)
 3 {
 4     //创建MailMessage对象
 5     MailAddress from = new MailAddress("[email protected]");
 6     MailAddress to = new MailAddress("[email protected]");
 7     MailMessage mailMessage = new MailMessage(from, to) ;
 8     mailMessage.Subject="主题";
 9     mailMessage.Body="这是一封来自远方的邮件.";
10
11     Attachment attachment01 = new Attachment("E:\\01.jpg"); //附件
12     Attachment attachment02 = new Attachment("E:\\02.mp3");
13     mailMessage.Attachments.Add(attachment01);
14     mailMessage.Attachments.Add(attachment02);
15
16     //创建SmtpClient对象      邮箱服务器smtp.163.com
17     SmtpClient smtpClient = new SmtpClient("smtp.163.com");
18     smtpClient.UseDefaultCredentials = true;
19     smtpClient.Credentials =
20     new NetworkCredential("邮箱账号", "登录密码");   //邮箱认证登录
21     //smtpClient.Timeout = 5000;
22     try
23     {
24     //使用异步发送,不会阻塞该线程
25     smtpClient.SendCompleted += new //完成发送调用回调函数
26     SendCompletedEventHandler(SendCompletedCallback);
27     smtpClient.SendAsync(mailMessage, mailMessage);
28     }
29     catch(Exception ex)
30     {
31       mailMessage.Dispose();    //主动释放资源
32       smtpClient.Dispose();
33       MessageBox.Show("发送失败!  "+System.Environment.NewLine+
34                    "错误信息:"+ ex.Message);
35     }
36    return;
37 }

//异步发送完成的回调函数:

 1 //异步发送邮件完成的回调函数
 2 public static void SendCompletedCallback(object sender,
 3                                     AsyncCompletedEventArgs e)
 4 {
 5    SmtpClient smtpClient = (SmtpClient)sender;
 6    //MailMessage mailMessage = (MailMessage)e.UserState;
 7    if (e.Cancelled)
 8    {
 9      MessageBox.Show("Send canceled.");
10    }
11    if (e.Error != null)
12    {
13      MessageBox.Show("错误信息: "+e.Error.ToString() );
14    }
15    else
16    {
17      MessageBox.Show("Message Sent.");
18      smtpClient.Dispose();
19      //mailMessage.Dispose();
20    }
21 }