Question

我对C＃和sendmail异步有一个奇怪的问题。当我使用普通的发送方法时，一切正常，我的电子邮件发送到正确的SMTP服务器。但是，当我使用SendAsync-Method时，它不起作用。

mailClient.SendCompleted += SendCompleted;

private static void SendCompleted (object sender, AsyncCompletedEventArgs e)
{
  string token = (string) e.UserState;

  if (e.Cancelled)
  {
    MessageBox.Show (string.Format ("{0}\n\"{1}\"", Application.Current.FindResource ("MailCannotSend"), token), LogFile.MSGBOX_ERROR, MessageBoxButton.OK, MessageBoxImage.Error);
    return;
  }

  MessageBox.Show (e.Error != null ? string.Format ("{0}\n\"{1}\"", e.Error, token) : "Complete!", LogFile.MSGBOX_ERROR, MessageBoxButton.OK, MessageBoxImage.Error);
}

SendAsync-Method始终在e.Cancelled内容中运行，没有任何异常或错误。我真的不知道为什么。

有人提示，线索吗？谢谢！

更新

以下是完整代码：

public void InitClient ()
{
  try
  {
    mailClient = new SmtpClient (SettingsHelper.TailSettings.AlertSettings.SmtpSettings.SmtpServerName, SettingsHelper.TailSettings.AlertSettings.SmtpSettings.SmtpPort)
    {
      UseDefaultCredentials = false,
      Timeout = 30000,
      DeliveryMethod = SmtpDeliveryMethod.Network
    };
    string decryptPassword = StringEncryption.Decrypt (SettingsHelper.TailSettings.AlertSettings.SmtpSettings.Password, LogFile.ENCRYPT_PASSPHRASE);
    NetworkCredential authInfo = new NetworkCredential (SettingsHelper.TailSettings.AlertSettings.SmtpSettings.LoginName, decryptPassword);
    mailClient.Credentials = authInfo;
    mailClient.SendCompleted += SendCompleted;

    if (SettingsHelper.TailSettings.AlertSettings.SmtpSettings.SSL)
      mailClient.EnableSsl = true;
    if (SettingsHelper.TailSettings.AlertSettings.SmtpSettings.TLS)
      ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

    MailAddress from = new MailAddress (SettingsHelper.TailSettings.AlertSettings.SmtpSettings.FromAddress);
    MailAddress to = new MailAddress (SettingsHelper.TailSettings.AlertSettings.EMailAddress);

    mailMessage = new MailMessage (from, to)
    {
      Subject = SettingsHelper.TailSettings.AlertSettings.SmtpSettings.Subject,
      SubjectEncoding = System.Text.Encoding.UTF8,
      BodyEncoding = System.Text.Encoding.UTF8,
      IsBodyHtml = false
    };
}
  catch (Exception ex)
  {
    ErrorLog.WriteLog (ErrorFlags.Error, GetType ( ).Name, string.Format ("{1}, exception: {0}", ex, System.Reflection.MethodBase.GetCurrentMethod ( ).Name));
  }
}

/// <summary>
/// Send E-Mail
/// </summary>
/// <param name="userToken">User token</param>
/// <param name="bodyMessage">Message to be send</param>
public void SendMail (string userToken, string bodyMessage = null)
{
  try
  {
    string userState = userToken;

    if (bodyMessage != null)
      mailMessage.Body = bodyMessage;

    if (String.Compare (userState, "testMessage", StringComparison.Ordinal) == 0)
      mailMessage.Body = string.Format ("Testmail from {0}", LogFile.APPLICATION_CAPTION);

    mailClient.SendAsync (mailMessage, userToken);

    if (String.Compare (userState, "testMessage", StringComparison.Ordinal) == 0)
      return;
}
  catch (Exception ex)
  {
    ErrorLog.WriteLog (ErrorFlags.Error, GetType ( ).Name, string.Format ("{1}, exception: {0}", ex, System.Reflection.MethodBase.GetCurrentMethod ( ).Name));
  }
}

Answer 1

SendAsync是异步的，将来会完成。显然，在 SendMail之前调用SendCompleted结束的方法的范围被触发。例如，控制台应用程序可能只是在您有机会处理此事件并处理完成异步操作之前结束。

任何进一步的建议都取决于应用程序的执行环境：ASP.NET，WCF，控制台，WinForms，WPF等。

SendMail SendAsync

1 个答案: