iTextSharp -在电子邮件附件中发送内存中的pdf
iTextSharp -在电子邮件附件中发送内存中的pdf
提问于 2009-07-28 18:54:17
我在这里问了几个问题，但仍然有问题。如果您能告诉我我在代码中做错了什么，我将不胜感激。我从一个ASP.Net页面运行上面的代码，得到"Cannot Access a Closed Stream“。
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("username@gmail.com", "username@gmail.com")
{
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("username@gmail.com", "my_password")
};
smtp.Send(mm); //the "Cannot Access a Closed Stream" error is thrown here谢谢！
编辑：
为了帮助寻找这个问题的答案的人，发送电子邮件附件中的pdf文件而不必实际创建该文件的代码如下(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("username@gmail.com", "username@gmail.com")
{
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("username@gmail.com", "password")
};
smtp.Send(mm);回答 4
Stack Overflow用户
回答已采纳
发布于 2009-07-28 19:05:45
您是否尝试过：
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，这解决了以前项目中的类似问题。
Stack Overflow用户
发布于 2009-07-28 19:46:17
我尝试了brianng发布的代码，它起作用了。只需将代码的顶部更改为：
var doc = new Document();
MemoryStream memoryStream = new MemoryStream();
PdfWriter writer = PdfWriter.GetInstance(doc, memoryStream); //capture the object
doc.Open();
doc.Add(new Paragraph("First Paragraph"));
doc.Add(new Paragraph("Second Paragraph"));
writer.CloseStream = false; //set the closestream property
doc.close(); //close the document without closing the underlying stream
memoryStream.Position = 0;
/* remainder of your code stays the same*/Stack Overflow用户
发布于 2009-07-28 18:58:01
调用doc.Close()可能会释放底层流。尝试删除doc.Close()，而不是设置memoryStream.Position = 0；
或者，您可以使用临时文件：
var tempFilePath = Path.GetTempFileName();
try
{
var doc = new Document();
PdfWriter.GetInstance(doc, File.OpenWrite(tempFilePath));
doc.Open();
doc.Add(new Paragraph("First Paragraph"));
doc.Add(new Paragraph("Second Paragraph"));
doc.Close();
MailMessage mm = new MailMessage("username@gmail.com", "username@gmail.com")
{
Subject = "subject",
IsBodyHtml = true,
Body = "body"
};
mm.Attachments.Add(new Attachment(tempFilePath, "test.pdf"));
SmtpClient smtp = new SmtpClient
{
Host = "smtp.gmail.com",
Port = 587,
EnableSsl = true,
Credentials = new NetworkCredential("username@gmail.com", "my_password")
};
smtp.Send(mm);
}
finally
{
File.Delete(tempFilePath);
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/1196059
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