iTextSharp使用Memorystream将PDF作为附件发送

一直在努力解决这个问题，并且已经非常接近了，但还没有达到。我正在尝试使用iTextSharp V 4.1.2发送PDF作为电子邮件附件。我在下面提供的代码同时使用了文件流和内存流，文件流是为了向自己证明PDF模板上有数据（确实如此）。此外，我收到了电子邮件，但没有附件。有人能看到我缺了什么吗？

public class BasePDFController : BaseController

{protected ActionResult eMailPdf（对象模型）{string pdf=路径。Combine（Server.MapPath（"~/Instructure/PDFTemplates/fw9.pdf"）；string outputFilePath=@"C:''Projects''Temp''test_template_filled.pdf"；

    MemoryStream memoryStream = new MemoryStream();
    PdfReader pdfFileReader = null;
    PdfReader pdfMemoryReader = null;
    try
    {
        pdfFileReader = new PdfReader(pdf);
        pdfMemoryReader = new PdfReader(pdf);
        using (FileStream pdfOutputFile = new FileStream(outputFilePath, FileMode.Create))
        {
            PdfStamper pdfFileStamper = null;
            PdfStamper pdfMemoryStamper = null;
            try
            {
                pdfFileStamper = new PdfStamper(pdfFileReader, pdfOutputFile);
                pdfMemoryStamper = new PdfStamper(pdfMemoryReader, memoryStream);
                AcroFields acroFileFields = pdfFileStamper.AcroFields;
                AcroFields acroMemoryFields = pdfMemoryStamper.AcroFields;
                acroFileFields.SetField("topmostSubform[0].Page1[0].f1_01_0_[0]", "Batman");
                pdfFileStamper.FormFlattening = true;
                pdfMemoryStamper.FormFlattening = true;
                pdfMemoryStamper.Writer.CloseStream = false;
                if (pdfMemoryStamper != null)
                {
                    pdfMemoryStamper.Close();
                }
                memoryStream.Position = 0;
                EmailProvider.Email email = new EmailProvider.Email();
                email = new EmailProvider.Email
                {
                    To = "someone@gamil.net",
                    Subject = "Scholars Attached PDF",
                    Body = "A PDF!",
                    Attachment = new Attachment(memoryStream, new System.Net.Mime.ContentType("application/pdf"))
                };
                EmailProvider.SendEmail(email);                    
                }
            finally
            {
                if (pdfFileStamper != null)
                {
                    pdfFileStamper.Close();
                }
            }
        }
    }
    finally
    {
        pdfFileReader.Close();
        pdfMemoryReader.Close();
    }
    return File(outputFilePath, "application/pdf", "Returned.pdf");
}

}

编辑：-是的，邮件提供商有问题。我不知道该怎么解决，或者这是否是发送的最佳方式？写这篇文章的人显然放弃了。编辑固定了附件。

    public static class EmailProvider
{
    public class Email
    {
        public String To { get; set; }
        public String Subject { get; set; }
        public String Body { get; set; }
        **public Attachment Attachment { get; set; }**
    }
    public static void SendEmail(Email email)
    {
        MailMessage mail = new MailMessage();
        mail.To.Add(email.To);
        mail.Subject = email.Subject;
        mail.Body = email.Body;
        mail.IsBodyHtml = true;
        mail.Attachments.Add(email.Attachment);
        SmtpClient smtp = new SmtpClient();
        smtp.Send(mail);
    }
}

电子邮件修复后，我收到了PDF！然而，当我尝试从电子邮件打开PDF时，我会收到一个错误：打开此文档时出错。文件已损坏，无法修复。想法？