c# - 使用 C# 从 g-mail 主机发送电子邮件到五个不同的电子邮件帐户

Question

我想向 5 个不同的电子邮件帐户发送电子邮件，每当我激活具有“---->这一行”的代码行时，我的问题就出在下面的代码中，它工作正常但是当我停用这些线路时，它会向一个电子邮件帐户发送五封电子邮件，而不会向其他人发送任何电子邮件。

有人知道我的代码有什么问题吗？

namespace WindowsFormsApplication9
{
    public partial class Form1 : Form
    {
        Thread t = null;
        MailMessage mailMessage;
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
          //textBox1 is recipients email addresses 
            String[] to = textBox1.Text.Split(';');

            foreach (String s in to)
            {
                Object[] array = new Object[2];
                array[0] = (textBox4.Text.ToString());
                array[1] = (s.ToString());
               // MessageBox.Show(s.ToString()); -----> this line 
                t = new Thread(sentEmail);
                t.Start(array);
                //MessageBox.Show("from: " + array[0].ToString()); -----> this line 
               // MessageBox.Show("to: " + array[1].ToString()); ----->this line 
                Thread.Sleep(50);


            }       

        }


        void sentEmail(Object array)
        {
            Object[] o = array as Object[];
            SmtpClient client = new SmtpClient();
            client.EnableSsl = true;
            client.Host = "smtp.gmail.com";
            client.Port = 587;
            client.Credentials = new NetworkCredential(textBox4.Text, textBox5.Text);
            mailMessage = new MailMessage(new MailAddress(o[0].ToString()), new MailAddress(o[1].ToString()));
            mailMessage.Body = textBox3.Text;
            mailMessage.Subject = textBox2.Text;
            client.Send(mailMessage);


        }



    }
}

Answer 1

您将 mailMessage 存储为表单的属性，地址在实际发送之前被另一个线程更改。添加 MessageBox 可以让一个线程在另一个线程开始之前完成。只需更改 sentMail 以创建一个新的 MailMessage 而不是重复使用现有的，您应该没问题:

public partial class Form1 : Form
{
    Thread t = null;
    //MailMessage mailMessage;  <-- take out this line

    void sentEmail(Object array)
    {
        Object[] o = array as Object[];
        SmtpClient client = new SmtpClient();
        client.EnableSsl = true;
        client.Host = "smtp.gmail.com";
        client.Port = 587;
        client.Credentials = new NetworkCredential(textBox4.Text, textBox5.Text);
        MailMessage mailMessage = new MailMessage(new MailAddress(o[0].ToString()), new MailAddress(o[1].ToString()));  // <-- don't use the Form property
        mailMessage.Body = textBox3.Text;
        mailMessage.Subject = textBox2.Text;
        client.Send(mailMessage);


    }