c# - 在.NET 2.0中发送电子邮件时出现“existing connection was forcibly closed”错误

我有asp.net网站。我正在通过SMTPClient发送电子邮件。不时出现此错误:

 InnerException = System.IO.IOException: Unable to read data from the transport connection:
    An existing connection was forcibly closed by the remote host. --->
       System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host
   at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
   at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   --- End of inner exception stack trace ---
   at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   at System.Net.DelegatedStream.Read(Byte[] buffer, Int32 offset, Int32 count)
   at System.Net.BufferedReadStream.Read(Byte[] buffer, Int32 offset, Int32 count)
   at System.Net.Mail.SmtpReplyReaderFactory.ReadLines(SmtpReplyReader caller, Boolean oneLine)
   at System.Net.Mail.SmtpReplyReaderFactory.ReadLine(SmtpReplyReader caller)
   at System.Net.Mail.SmtpReplyReader.ReadLine()
   at System.Net.Mail.CheckCommand.Send(SmtpConnection conn, String& response)
   at System.Net.Mail.DataStopCommand.Send(SmtpConnection conn)
   at System.Net.Mail.SmtpConnection.OnClose(Object sender, EventArgs args)
   at System.Net.ClosableStream.Close()
   at System.Net.Mail.MailWriter.Close()
   at System.Net.Mail.SmtpClient.Send(MailMessage message).

代码:

 SmtpClient smtpClient = new SmtpClient(ConfigurationManager.AppSettings["smtpserverwwwpo"]);
    try
    {
        NetworkCredential basicCredential =
            new NetworkCredential(ConfigurationManager.AppSettings["smtp_user_name"], ConfigurationManager.AppSettings["smtp_password"]);
        smtpClient.UseDefaultCredentials = false;
        smtpClient.Credentials = basicCredential;
    }
    catch
    {
        smtpClient.UseDefaultCredentials = true;
    }

    System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage();
    msg.Subject = subject;
    msg.To.Add(new MailAddress(someEmail));
    msg.From = new MailAddress(ConfigurationManager.AppSettings["from_email_address"]);
    msg.Headers.Add("Content-Type", "text/html");
    msg.BodyEncoding = System.Text.Encoding.UTF8;

try{
        smtpClient.Send(msg);
}
catch(Exception ex)
{
 //write log
}

}

是什么原因引起的？

最佳答案

MailMessage是一次性的。您可以尝试将其包装在using语句中。

using(var message = new MailMessage {Subject ="...", Body="..."})
{
   message.To.Add("email address");
   new SmtpClient().Send(message)
}

关于c# - 在.NET 2.0中发送电子邮件时出现“existing connection was forcibly closed”错误，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/8581112/