通过SmtpClient发送电子邮件会在system.dll中导致'System.InvalidOperationException [英] Sending e-mail by SmtpClient causes 'System.InvalidOperationException in system.dll

问题描述

我想在控制台应用程序中发送电子邮件。我用过：

I wanted to send e-mail in my console application. I used:

SmtpClient client = new SmtpClient();
                    MailMessage msg = new MailMessage();
                    MailAddress to = new MailAddress("[e-mail]");
                    MailAddress from = new MailAddress("[e-mail]");
                    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);
                    }

它会导致：

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

中发生了类型'System.InvalidOperationException'的第一次机会异常

该代码的作者说，应该添加：

author of this code said that one should add:

<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，但这不是ASP .NET MVC应用程序，我看不到任何网站

to Web.config but this is not ASP .NET MVC application and I don't see any web config.

推荐答案

如果不使用任何配置文件，则必须使用代码配置SMTP客户端。
例如：

You have to configure your SMTP client in code if you are not using any configuration file. For example:

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

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