SMTP sendasync在Windows 7中工作，但在XP中失败

Question

我在通过smtp从我们的内部C＃应用程序发送单个电子邮件时收到的错误消息中挣扎。它在Windows 7中正常工作，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邮件服务器进行交付。防火墙处于关闭状态，并且在发生故障的计算机上禁用McAfee。错误信息返回给客户端应用程序是：

Error occurred when sending mail to [email protected] 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，所以我们可以更新与邮件发送的结果的用户界面。我有一个邮件类包含这两个方法来设置和发送消息。

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

     SmtpClient client = new SmtpClient("smtp.gmail.com", 587) 
      { 
       Credentials = new NetworkCredential("[email protected]", "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("[email protected]", "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(); 

    } 

在我宣布的形式

的更新委托

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

我一直在使用只是一个IP地址，SMTP服务器尝试了以下，试图在邮件中禁用SSL，确保所有防火墙都禁用，所有病毒软件被禁用。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，所以没有任何意义，也没有解决问题。

正如我所指出的，代码在Win7中工作，但不是XP。有什么想法吗？

Answer 1

我们的解决方案只是将Windows XP机器升级到Windows 7.在这两个版本的Windows之间关于权限发送smtp消息的方式必须有一个操作系统级别的更改。它在Win7中完美无瑕。