由SmtpClient發送電子郵件導致system.dll中出現System.InvalidOperationException

Question

我想在我的控制檯應用程序中發送電子郵件。我用：

SmtpClient client = new SmtpClient(); 
        MailMessage msg = new MailMessage(); 
        MailAddress to = new MailAddress("informatyka4445@wp.pl"); 
        MailAddress from = new MailAddress("informatyka4444@wp.pl"); 
        msg.IsBodyHtml = true; 
        msg.Subject = "Mail Title"; 
        msg.To.Add(to); 
        msg.Body = "Your message"; 
        msg.From = from; 
        try { 
         client.Send(msg);//THIS CAUSES ERROR 
        } catch (InvalidOperationException e) { 
         Console.WriteLine(e); 
        } 

，它會導致：此代碼的

A first chance exception of type 'System.InvalidOperationException' occurred in System.dll 

撰文稱，應該加上：

<system.net> 
    <mailSettings> 
     <smtp deliveryMethod="Network"> 
     <network host="smtp.gmail.com" port="587" userName="your email address" password="your password" defaultCredentials="false" enableSsl="true" /> 
     </smtp> 
    </mailSettings> 
    </system.net> 

到Web.config中，但這不是ASP .NET MVC應用程序，我沒有看到任何Web配置。

Answer 1

如果不使用任何配置文件，則必須在代碼中配置SMTP客戶端。 例如：

SmtpClient smtp = new SmtpClient(); 
smtp.Host = "smtp.gmail.com"; 
smtp.UseDefaultCredentials = false; 
smtp.Credentials = System.Net.NetworkCredential("youremail", "yourpassword"); 
smtp.EnableSsl = true;