C# 利用SMTP异步发送邮件

C#实现收发邮件功能需要用到两个命名空间  System.Net; 和 System.Net.Mail;

SmtpClient client = new SmtpClient("smtp.gmail.com", 587); //发件服务器地址 client.UseDefaultCredentials = false; client.DeliveryMethod = SmtpDeliveryMethod.Network; client.Credentials = new NetworkCredential("[email protected]", "******"); client.EnableSsl = true; client.Timeout = 15000; client.SendCompleted += new SendCompletedEventHandler(client_SendCompleted); //异步发送邮件完成响应事件  MailMessage mmsg = new MailMessage(); mmsg.From = new MailAddress("[email protected]"); //发件人邮箱地址 mmsg.To.Add("[email protected]"); //收件人邮箱地址  mmsg.Subject = "最新订单数据"; //邮件主题 mmsg.SubjectEncoding = Encoding.UTF8; //主题编码 mmsg.Body = msg; //邮件正文 mmsg.IsBodyHtml = true; //设置为HTML格式 mmsg.BodyEncoding = Encoding.UTF8; //正文编码 mmsg.Priority = MailPriority.High; //优先级 mmsg.Attachments.Add(new Attachment(file));//增加附件 try { client.SendAsync(mmsg, ""); //异步发送邮件 } catch (Exception ex) { MessageBox.Show(ex.Message); }

由于采用异步发送邮件，需要添加一个异步完成时响应事件 client_SendCompleted

private void client_SendCompleted(object sender, AsyncCompletedEventArgs e)
{
    if (e.Error != null)
    {
        MessageBox.Show("邮件发送失败，详情：" + e.Error.Message);
    }
    else
    {
        MessageBox.Show("邮件发送成功！");
    }
}