Question

我想通过Gmail向C＃中的多个收件人发送电子邮件。这是我的代码，但此代码仅向一个地址发送电子邮件。我应该如何修改它？

private void button1_Click(object sender, EventArgs e)
{
        if (textBox1.Text == "" || richTextBox1.Text == "")
        {
            MessageBox.Show("Please fill out the boxes!");
            return;
        }

        try
        {
            MailMessage message = new MailMessage();
            SmtpClient smtp = new SmtpClient();

            message.From = new MailAddress("tamogatas.dolgozoadatbazis@gmail.com");
            message.To.Add(new MailAddress(Form1.cimzett));
            message.Subject = textBox1.Text;
            message.Body = richTextBox1.Text + Environment.NewLine +  "This message was sent from " + (Login.loginnev);

            smtp.Port = 587;
            smtp.Host = "smtp.gmail.com";
            smtp.EnableSsl = true;
            smtp.UseDefaultCredentials = false;
            smtp.Credentials = new NetworkCredential("USERNAME@gmail.com", "PASSWORD");
            smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
            smtp.Send(message);
            MessageBox.Show("The mail was sent successfully!");
        }
        catch (Exception ex)
        {
            MessageBox.Show("Error " + ex.Message);
        }
}

感谢您的回答！

Answer 1

String[] emails={"n1@gmail.com","n2@gmail.com","n3@gmail.com","n4@gmail.com"};
foreach(var items as emails)
{

  MailMessage message = new MailMessage();
            SmtpClient smtp = new SmtpClient();

            message.From = new MailAddress(items);
            message.To.Add(new MailAddress(Form1.cimzett));
            message.Subject = textBox1.Text;
            message.Body = richTextBox1.Text + Environment.NewLine +  "This message was sent from " + (Login.loginnev);

            smtp.Port = 587;
            smtp.Host = "smtp.gmail.com";
            smtp.EnableSsl = true;
            smtp.UseDefaultCredentials = false;
            smtp.Credentials = new NetworkCredential("tamogatas.dolgozoadatbazis@gmail.com", "adminisztrator0");
            smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
            smtp.Send(message);
            MessageBox.Show("The mail was sent successfully!");
}

Answer 2

private void button1_Click(object sender, EventArgs e)
{
        if (textBox1.Text == "" || richTextBox1.Text == "")
        {
            MessageBox.Show("Please fill out the boxes!");
            return;
        }

        try
        {
            MailMessage message = new MailMessage();
            SmtpClient smtp = new SmtpClient();

            message.From = new MailAddress("tamogatas.dolgozoadatbazis@gmail.com");
            message.To.Add(new MailAddress(Form1.cimzett)); <---- THIS LINE
            message.To.Add(new MailAddress("lalala@gmail.com"));
            message.To.Add(new MailAddress("lalala3@gmail.com"));
            message.To.Add(new MailAddress("lalala2@gmail.com"));
            message.Subject = textBox1.Text;
            message.Body = richTextBox1.Text + Environment.NewLine +  "This message was sent from " + (Login.loginnev);

            smtp.Port = 587;
            smtp.Host = "smtp.gmail.com";
            smtp.EnableSsl = true;
            smtp.UseDefaultCredentials = false;
            smtp.Credentials = new NetworkCredential("USERNAME@gmail.com", "PASSWORD");
            smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
            smtp.Send(message);
            MessageBox.Show("The mail was sent successfully!");
        }
        catch (Exception ex)
        {
            MessageBox.Show("Error " + ex.Message);
        }
}

Answer 3

您的代码存在一些问题，但是为了解决主要问题，您似乎依赖richTextBox1.Text来提供电子邮件，但这是一个假设

所以你在做什么： message.To.Add(new MailAddress(Form1.cimzett));，可能会将Form1.cimzett更改为richTextBox1.Text？

此外，您可以在Button逻辑之外声明所有SmtpClient代码，而是在此类中声明它。

向多个收件人发送电子邮件

3 个答案: