用.net实现简单的邮件发送(异步方式)

using System;using System.ComponentModel;using System.Net;using System.Text;using System.Net.Mail;namespace ConsoleApplication1{ class Program { static bool mailSent = false; public static void SendCompletedCallback(object sender, AsyncCompletedEventArgs e) { // Get the unique identifier for this asynchronous operation. String token = (string)e.UserState; if (e.Cancelled) { Console.WriteLine("[{0}] Send canceled.", token); } if (e.Error != null) { Console.WriteLine("[{0}] {1}", token, e.Error.ToString()); } else { Console.WriteLine("Message sent."); } mailSent = true; } public static void Main(string[] args) { // Command line argument must the the SMTP host. SmtpClient client = new SmtpClient(); ////这里选择自己的邮箱服务地址，如果发送失败参见解决办法 client.Host = "smtp.sohu.com";//主机 地址 client.Port = 25;//端口号 Console.WriteLine("请输入您的搜狐邮箱"); string frommail = Console.ReadLine(); Console.WriteLine("请输入您邮箱的密码："); string pwd = Console.ReadLine(); Console.WriteLine("请输入您要显示的昵称："); string sname = Console.ReadLine(); Console.WriteLine("请输入收件人的邮箱："); string tomail = Console.ReadLine(); MailAddress from = new MailAddress(frommail, sname, Encoding.UTF8);//发件人,第二个参数为显示的发件人昵称 MailAddress to = new MailAddress(tomail);//收件人 client.DeliveryMethod = SmtpDeliveryMethod.Network;//以网络smtp方式发送 client.UseDefaultCredentials = false; client.Credentials = new NetworkCredential(frommail, pwd);//发件方的用户名和密码 // Specify the message content. MailMessage message = new MailMessage(from, to); Console.WriteLine("请输入邮件正文"); message.Body = Console.ReadLine(); // Include some non-ASCII characters in body and subject. message.BodyEncoding = Encoding.UTF8;//邮件正文编码 Console.WriteLine("请输入邮件主题"); message.Subject = Console.ReadLine(); message.SubjectEncoding = Encoding.UTF8;//邮件主题的编码 // Set the method that is called back when the send operation ends. client.SendCompleted += new SendCompletedEventHandler(SendCompletedCallback);//调用回调方法 // The userState can be any object that allows your callback // method to identify this send operation. // For this example, the userToken is a string constant. string userState = "test message1"; client.SendAsync(message, userState);//异步发送,把usrState传送到回调方法SendCompletedCallback中 //client.Send(message); Console.WriteLine("Sending message... press c to cancel mail. Press any other key to exit."); string answer = Console.ReadLine(); // If the user canceled the send, and mail hasn't been sent yet, // then cancel the pending operation. if (answer.StartsWith("c") && mailSent == false) { client.SendAsyncCancel();//取消发送 } // Clean up. message.Dispose(); Console.WriteLine("Goodbye."); Console.ReadLine(); } }}