Question

我有一个文件，数据一直保存到... 我有一个计时器，每4秒运行一次我的流程如下：文件x.txt一直处于打开状态。 4秒后我想停止进程并通过电子邮件发送此文件。我想一直重复上述步骤。

我的代码：

var timer = new System.Timers.Timer(4000);
        timer.Enabled = true;
        timer.Elapsed += (object sender, System.Timers.ElapsedEventArgs e) =>
        {
            wrtiteToFile.Suspend();

            SendEmail();
            wrtiteToFile.Resume();

        };

  static void SendEmail()
    {
        SmtpClient smtpClient = new SmtpClient();
        NetworkCredential basicCredential =
            new NetworkCredential("", "");
        MailMessage message = new MailMessage();
        MailAddress fromAddress = new MailAddress("");
        smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
        smtpClient.Port = ;
        smtpClient.Host = "";
        smtpClient.UseDefaultCredentials = false;
        smtpClient.Credentials = basicCredential;
        smtpClient.EnableSsl = true;


        message.From = fromAddress;
        message.Subject = "";
        //Set IsBodyHtml to true means you can send HTML email.
        message.IsBodyHtml = true;
        message.Body = "";
        message.To.Add("");
        message.Attachments.Add(new Attachment(Application.StartupPath + @"\log.txt"));


        smtpClient.Send(message);
    }

该进程无法访问该文件＆＃39; C：\ log.txt＆＃39;因为它正被另一个进程使用。它不起作用。我能做到这一点的最佳方式是什么？我试过锁，但它也不起作用。我必须使用.net framework 2.0

Answer 1

您没有处置资源。这样就不确定何时释放资源（文件锁）。

您应该通过妥善处理资源来解决问题。（免责声明，我没有检查过这个）

static void SendEmail()
{
    using (SmtpClient smtpClient = new SmtpClient())
    using (MailMessage message = new MailMessage())
    using (Attachment attachment = new Attachment(Application.StartupPath + @"\log.txt"))
    {
        NetworkCredential basicCredential =
            new NetworkCredential("", "");

        MailAddress fromAddress = new MailAddress("");
        smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
        smtpClient.Port = "";
        smtpClient.Host = "";
        smtpClient.UseDefaultCredentials = false;
        smtpClient.Credentials = basicCredential;
        smtpClient.EnableSsl = true;

        message.From = fromAddress;
        message.Subject = "";
        //Set IsBodyHtml to true means you can send HTML email.
        message.IsBodyHtml = true;
        message.Body = "";
        message.To.Add("");
        message.Attachments.Add(attachment);


        smtpClient.Send(message);
    }
}

using语句将隐式调用一次性用法的Dispose方法，从而释放文件句柄和其他类型的连接。

Answer 2

您的SendMail方法块文件。最简单的方法修复：）

var timer = new System.Timers.Timer(4000);
    timer.Enabled = true;
    timer.Elapsed += (object sender, System.Timers.ElapsedEventArgs e) =>
    {
        timer.Enabled = false;
        wrtiteToFile.Suspend();
        SendEmail();
        wrtiteToFile.Resume();
        timer.Enabled = true;

    };

定时器和线程锁定

2 个答案: