Question

我正在努力处理我通过smtp从我们的内部C＃应用程序发送个别eamils时收到的错误消息。它在Windows 7中工作正常但我们在XP机器上收到以下错误消息。我们正在使用我们的Google邮件帐户和Google的smtp.gmail.com邮件服务器来提供服务。防火墙已关闭，并且在发生故障的计算机上禁用了McAfee。返回客户端应用程序的错误消息是：

Error occurred when sending mail to xxxxxx@xxxxxxx.com System.Net.Mail.SmtpException: Failure sending mail. ---> System.IO.IOException: Unable to read data from the transport connection: A request to send or receive data was disallowed because the socket is not connected and (when sending on a datagram socket using a sendto call) no address was supplied. ---> System.Net.Sockets.SocketException: A request to send or receive data was disallowed because the socket is not connected and (when sending on a datagram socket using a sendto call) no address was supplied
   at System.Net.Sockets.Socket.BeginReceive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags, AsyncCallback callback, Object state)
   at System.Net.Sockets.NetworkStream.BeginRead(Byte[] buffer, Int32 offset, Int32 size, AsyncCallback callback, Object state)
   --- End of inner exception stack trace ---
   at System.Net.Mail.SmtpConnection.ConnectAndHandshakeAsyncResult.End(IAsyncResult result)
   at System.Net.Mail.SmtpClient.ConnectCallback(IAsyncResult result)
   --- End of inner exception stack trace ---

我们的C＃代码是多线程的，因此我们可以使用邮件发送的结果更新用户界面。我有一个包含这两种方法的邮件程序类来设置和发送邮件。

  public void Send()
    {
        m_frmAccess.Invoke(m_frmAccess.UpdateDelegate,
        new Object[] { "" });

        SmtpClient client = new SmtpClient("smtp.gmail.com", 587)   
           {
               Credentials = new NetworkCredential("xxxxxxxxx@xxxxxxx.com", "xxxxxxxxx"),
               EnableSsl = true
           };

        try
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("Message Body");
            LinkedResource logo = new LinkedResource("DA-NewBrand-Stack-100px-for.jpg");
            logo.ContentId = "companylogo";
            htmlView.LinkedResources.Add(logo);
            m_Errormessage = "";
            MailAddress to = new MailAddress(m_To);
            MailAddress from = new MailAddress(m_From, "Company");
            MailAddress cc = new MailAddress("xxxx@xxxxxxx.com", "Name");
            MailMessage message = new MailMessage(from, to);
            message.CC.Add(cc);
            message.AlternateViews.Add(htmlView);
            message.IsBodyHtml = true;
            message.BodyEncoding = System.Text.Encoding.UTF8;
            message.Subject = m_Subject;
            client.Timeout = 10000;
            message.SubjectEncoding = System.Text.Encoding.UTF8;
            object userState = message;
            client.SendCompleted += new SendCompletedEventHandler(SmtpClient_OnCompleted);
            client.SendAsync(message, userState);

        }
        catch (Exception ex)
        {
            m_Errormessage = "";
            m_Errormessage = ex.Message + Environment.NewLine + ex.StackTrace.ToString() + Environment.NewLine +               ex.InnerException + Environment.NewLine;
            m_frmAccess.Invoke(m_frmAccess.UpdateDelegate,
            new Object[] { m_Errormessage });
        }

    }



    public void SmtpClient_OnCompleted(object sender, AsyncCompletedEventArgs e)
    {
        //Get the Original MailMessage object
        m_result = "";
        MailMessage mail = (MailMessage)e.UserState;


        //write out the subject
        string subject = mail.Subject;
        try
        {
            if (e.Cancelled)
            {
                m_result = "Send canceled for message to " + mail.To.ToString();
            }
            if (e.Error != null)
            {
                m_result = "Error occurred when sending mail to " + mail.To.ToString() + " " + e.Error.ToString();
            }
            else
            {
                m_result = "Message to " + mail.To.ToString() + " was sent.";
            }
            m_frmAccess.Invoke(m_frmAccess.UpdateDelegate,
                   new Object[] { m_result });

        }
        catch (Exception ex)
        {
            m_result = ex.Message + ex.InnerException.ToString();
        }

    }

以下三种方法都在winform中。

    public void UpdateText(string message)
    {
       txtMessage.Text = message; 

    }

    private void ThreadMethod()
    {
        clsSmtpEmailer smtpMailer = new clsSmtpEmailer(this);
        CollectDataToEmail(smtpMailer);
        smtpMailer.Send();
    }

    private void btnSendEmail_Click(object sender, EventArgs e)
    {

        myThread = new Thread(new ThreadStart(ThreadMethod));
        myThread.Start();

    }

在表单中我为更新委托声明了以下内容

    public delegate void UpdateTextCallback(string text);
    public UpdateTextCallback UpdateDelegate;

我曾尝试仅为smtp服务器使用IP地址，尝试在消息中禁用ssl，确保所有防火墙都被禁用，所有病毒软件都被禁用。我在本地XP机器上为IIS安装了smtp，但由于我没有将它用作服务器，因此没有意义，也没有解决问题。

正如我所说，代码适用于Win7但不适用于XP。有什么想法吗？

Answer 1

我们的解决方案只是将Windows XP计算机升级到Windows 7.对于权限，必须在这两个版本的Windows之间发送smtp消息的方式发生操作系统级别更改。它在Win7中完美运行。

SMTP sendasync在Windows 7中有效，但在XP中失败

1 个答案: