使用 MVC5 发送邮件时的附件问题

问：

我想向客户发送活动邮件。附有一个PDF文件。 我的联系人列表是一个 MS SQL 表。我曾经选择每个收件人。所有电子邮件都有一个附件，但只有第一封电子邮件具有正确的文件;其他人的大小是 0。 我检查了调试模式，但我无法弄清楚。foreach

public void SendEmail(HttpPostedFileBase Attachedfile)
{
    var smtpHost = GetSmtpInfo("SmtpHost");
    var smtpEmailAccount = GetSmtpInfo("SmtpEmailAccount");
    var smtpPassword = GetSmtpInfo("SmtpPassword");
    int smptPort = Convert.ToInt32(GetSmtpInfo("SmtpPort"));
    string subject = "Test Attached Mail";
    string body = "Test Mail with attachement";

    foreach (var item in db.TblContact)
    {
        using (MailMessage mailMessage = new MailMessage())
        {
            mailMessage.From = new MailAddress(smtpEmailAccount);
            mailMessage.Subject = subject;
            mailMessage.Body = body;
            mailMessage.IsBodyHtml = true;
            mailMessage.To.Add(new MailAddress(item.Email));
            if (Attachedfile != null)
            {
                string fileName = Path.GetFileName(Attachedfile.FileName);
                mailMessage.Attachments.Add(new Attachment(Attachedfile.InputStream, fileName));
            }
            SmtpClient smtp = new SmtpClient();
            smtp.Host = smtpHost;
            smtp.EnableSsl = false;
            System.Net.NetworkCredential NetworkCred = new System.Net.NetworkCredential();
            NetworkCred.UserName = smtpEmailAccount;
            NetworkCred.Password = smtpPassword;
            smtp.UseDefaultCredentials = true;
            smtp.Credentials = NetworkCred;
            smtp.Port = smptPort;

            try
            {
                smtp.Send(mailMessage);
                ViewBag.success = "Email Sent";
            }
            catch (Exception ex)
            {
                ViewBag.error = "Error sending mail. Reason :  " + ex.Message;
            }
        }
    }
}

我需要向每个客户发送一封单独的电子邮件。