Question

我使用C＃发送电子邮件。当互联网可用时，它正常工作，但它一次又一次地返回异常消息，并在互联网连接不可用时停止执行。如果连接不可用，如何忽略发送电子邮件并继续执行，或任何其他合适的方法来做到这一点..

while (true)
{
    try
    {
        Thread.Sleep(50);
        MailMessage mail = new MailMessage();
        SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");
        mail.From = new MailAddress("mymail");
        mail.To.Add("mymail");
        mail.Subject = "data - 1";
        mail.Body = "find attachement";
        System.Net.Mail.Attachment attachment;
        attachment = new System.Net.Mail.Attachment(filepath);
        mail.Attachments.Add(attachment);
        SmtpServer.Port = 587;
        SmtpServer.Credentials = new System.Net.NetworkCredential("myemail", "mypassword");
        SmtpServer.EnableSsl = true;
        SmtpServer.Send(mail);
    }
    catch (Exception)
    {
        MessageBox.Show("Internet Connection is not found");
    }
}

Answer 1

任何依赖于重复尝试的解决方案都可能无休止地循环。

您的代码是在同步发送电子邮件，为什么不send asynchronously使用pickup directory

这会将电子邮件放入SMTP提取目录，并且SMTP服务器将通过重试一段可配置的时间来处理暂时的网络问题。

Answer 2

当没有互联网时，只需摆脱循环：

{
"capabilities":
[
{
"browserName": "",
"version":"",
"maxInstances": 1,
"platform":"ANDROID"
}
],
"configuration":
{
"cleanUpCycle":2000,
"timeout":30000,
"proxy": "org.openqa.grid.selenium.proxy.DefaultRemoteProxy",
"url":"http://127.0.0.1:4720/wd/hub",
"host":"192.168.1.163",
"port": 4723,
"maxSession": 1,
"register": true,
"registerCycle": 5000,
"hubPort": 4444,
"hubHost": "192.168.1.163"
}
}

Answer 3

最好使用testconnection方法，如果返回true则发送电子邮件。类似的东西：

while(true)
{ 
   if(TestConnection())
   {            
        SendEmail();    // you should leave the try...catch.. anyway in case 
                        // the connection failed between the TestConnection     
                        // and the SendEmail() operation. But then do not 
                        // prompt a messagebox, just swallow
        Thread.Sleep(50);       
   }
}

现在在TestConnection实现中，您可以尝试从以下链接获得帮助：

enter link description here

Answer 4

使用try catch继续执行

bool a = true;
while (a)
{
try {

     Thread.Sleep(50);
     MailMessage mail = new MailMessage();
     SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");
     mail.From = new MailAddress("mymail");
     mail.To.Add("mymail");
     mail.Subject = "data - 1";
     mail.Body = "find attachement";
     System.Net.Mail.Attachment attachment;
     attachment = new System.Net.Mail.Attachment(filepath);
     mail.Attachments.Add(attachment);
     SmtpServer.Port = 587;
     SmtpServer.Credentials = new System.Net.NetworkCredential("myemail", "mypassword");
     SmtpServer.EnableSsl = true;
     SmtpServer.Send(mail);
} catch (Exception e) {
     MessageBox.Show(e.Message);
     a = false;
}

当你edited your question时，我也更新了我的答案。

现在我创建了布尔值'a'，这是真的，直到你陷入困境 catch子句，然后它将通过设置从while循环中断 'a'等于假。

Answer 5

试试这个：

while (true)
    {
        try
        {
            Thread.Sleep(50);
            MailMessage mail = new MailMessage();
            SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");
            mail.From = new MailAddress("mymail");
            mail.To.Add("mymail");
            mail.Subject = "data - 1";
            mail.Body = "find attachement";
            System.Net.Mail.Attachment attachment;
            attachment = new System.Net.Mail.Attachment(filepath);
            mail.Attachments.Add(attachment);
            SmtpServer.Port = 587;
            SmtpServer.Credentials = new System.Net.NetworkCredential("myemail", "mypassword");
            SmtpServer.EnableSsl = true;
            SmtpServer.Send(mail);
        }
        catch (Exception ex)
        {
            MessageBox.Show("Error " + ex.InnerException);
            return false;
        }
    }

或者你可以将bool设置为true，然后检查bool是否为false FX：

string noInterNet = "";
while (true)
        {
            try
            {
                Thread.Sleep(50);
                MailMessage mail = new MailMessage();
                SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");
                mail.From = new MailAddress("mymail");
                mail.To.Add("mymail");
                mail.Subject = "data - 1";
                mail.Body = "find attachement";
                System.Net.Mail.Attachment attachment;
                attachment = new System.Net.Mail.Attachment(filepath);
                mail.Attachments.Add(attachment);
                SmtpServer.Port = 587;
                SmtpServer.Credentials = new System.Net.NetworkCredential("myemail", "mypassword");
                SmtpServer.EnableSsl = true;
                SmtpServer.Send(mail);
            }
            catch (Exception ex)
            {
                noInterNet = ex.InnerException;
            }
        }

然后在代码的最后做：

if(noInterNet != "")
MessageBox.Show("Error " + noInterNet);

如何忽略发送电子邮件方法并继续执行？

5 个答案: