iTextSharp - 在电子邮件附件中发送内存中的 pdf

我在这里问了几个问题，但仍然遇到问题。如果您能告诉我我的代码中做错了什么，我将不胜感激。我从 ASP.Net 页面运行上面的代码并得到“无法访问关闭的流”。

var doc = new Document();

MemoryStream memoryStream = new MemoryStream();

PdfWriter.GetInstance(doc, memoryStream);
doc.Open();
doc.Add(new Paragraph("First Paragraph"));
doc.Add(new Paragraph("Second Paragraph"));

doc.Close(); //if I remove this line the email attachment is sent but with 0 bytes 

MailMessage mm = new MailMessage("[email protected]", "[email protected]")
{
    Subject = "subject",
    IsBodyHtml = true,
    Body = "body"
};

mm.Attachments.Add(new Attachment(memoryStream, "test.pdf"));
SmtpClient smtp = new SmtpClient
{
    Host = "smtp.gmail.com",
    Port = 587,
    EnableSsl = true,
    Credentials = new NetworkCredential("[email protected]", "my_password")
};

smtp.Send(mm); //the "Cannot Access a Closed Stream" error is thrown here

谢谢！！！

EDIT:

为了帮助某人寻找这个问题的答案，发送附在电子邮件中的 pdf 文件而无需实际创建文件的代码如下（感谢 Ichiban 和 Brianng）：

var doc = new Document();
MemoryStream memoryStream = new MemoryStream();
PdfWriter writer = PdfWriter.GetInstance(doc, memoryStream);

doc.Open();
doc.Add(new Paragraph("First Paragraph"));
doc.Add(new Paragraph("Second Paragraph"));

writer.CloseStream = false;
doc.Close();
memoryStream.Position = 0;

MailMessage mm = new MailMessage("[email protected]", "[email protected]")
{
    Subject = "subject",
    IsBodyHtml = true,
    Body = "body"
};

mm.Attachments.Add(new Attachment(memoryStream, "filename.pdf"));
SmtpClient smtp = new SmtpClient
{
    Host = "smtp.gmail.com",
    Port = 587,
    EnableSsl = true,
    Credentials = new NetworkCredential("[email protected]", "password")

};

smtp.Send(mm);

你有没有尝试过：

PdfWriter writer = PdfWriter.GetInstance(doc, memoryStream);

// Build pdf code...

writer.CloseStream = false;
doc.Close();

// Build email

memoryStream.Position = 0;
mm.Attachments.Add(new Attachment(memoryStream, "test.pdf"));

如果我没记错的话，这解决了之前项目中的类似问题。

See http://forums.asp.net/t/1093198.aspx