some problem about System.Net.Mail

Question

           SmtpClient smtp = new SmtpClient(); //实例化一个SmtpClient
            MailMessage mm = new MailMessage();
            //邮件发送

            //leave out the other set

            smtp.Timeout = 60*1000;//超时
            smtp.Send(mm);                             

             mm.Dispose();
             smtp.Dispose();

             I can receive the E-Mail, and the E-mail is correct, but the procedure is blocked. Did anyone have this problem？

Answer 1

你好：

的确如此，MSDN关于SmptClient类说明说明会阻止当前进程。

如果你想边发送边做其它东西，尝试：

1）使用异步发送机制SendAsync。

2）自定义一个后台线程，在里边调用send发送，然后自定义一个事件通知主程序已经完成发送。

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Answer 2

多谢

可是，现在的问题是那边能够接收到邮件，但是程序卡住了，不继续运行了，这个有点奇怪，而且不是每次都这样，是连续运行一段时间会出现

Answer 3

我还是建议用我上面的方法比较妥当。

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Answer 4

个人建议使用 SendAsync 是比较方便的，而且不用单独再开一个线程，增加了复杂性

SendAsync 本身能够完成异步工作，单独调用这个方法是不会出现“卡住”的问题的，如果楼主的程序出现了“卡顿”，请仔细检查其它可能引起此类问题的代码，尤其是如 smtpClient.Send 这种“阻塞”式的同步方法，或者有没有什么 While 这样的循环不小心死循环了。

使用 SendAsync 只需要注册侦听 SmtpClient 提供的事件，当发送完成后就可以收到通知进行下一步的逻辑处理，很简单且有效

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不重要的其实最重要