Question

这是我一直在制作的代码，我只是测试它是否有效但是有一条错误消息指出“System.FormatException”

我无法理解我遇到了这样的问题。请帮忙

 public Mail(string sendMail)
    {
        this.sendAddress = new MailAddress(sendMail); // exception here
    }

    public void SetToAddress(string toMail)
    {
        this.toAddress = new MailAddress(toMail);
    }

    public string SendEmail(string subject, string body)
    {
        SmtpClient smtp = null;
        MailMessage message = null;
        try
        {
            smtp = new SmtpClient
            {
                Host = "smtp.gmail.com",
                EnableSsl = true,
                DeliveryMethod = SmtpDeliveryMethod.Network,
                Credentials = new NetworkCredential(sendAddress.Address, sendPassword),
                Timeout = 20000
            };
            message = new MailMessage(sendAddress, toAddress)
            {
                Subject = subject,
                Body = body
            };
            smtp.Send(message);
            return "send mail ok";
        }
        catch (Exception e)
        {
            return "send mail fail";
        }
        finally
        {
            if (smtp != null) { smtp.Dispose(); }
            if (message != null) { message.Dispose(); }
        }
    }
}

namespace WindowsFormsApp12
{
    public partial class Form1 : Form
    {
        Mail mail = new Mail("email address type");
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string toAddress = this.textBox2.Text;
            string subject = this.textBox1.Text;
            string body = this.textBox3.Text;
            if (toAddress == "")
            {
                MessageBox.Show("type in email address");
            }
            if (subject == "")
            {
                MessageBox.Show("type in email title");
            }
            if (body == "")
            {
                MessageBox.Show("type in email contents");
            }
            mail.SetToAddress(toAddress);
            MessageBox.Show(mail.SendEmail(subject, body));
        }
    }
}

Answer 1

您没有设置邮件的.from部分。

mail = new MailMessage(sendAddress, toAddress)
{
    Subject = subject,
    Body = body,
    From = new MailAddress("Blah@Blah.com;")
};

可以添加

到地址

 mail.To.Add("email@address.com");

Answer 2

MailAddress的构造函数的FormatException表示无效的电子邮件地址。来源MSDN documentation for MailAddress constructor。

为C＃电子邮件发送失败

2 个答案: