从Memory Stream创建并附加PDF文件 [英] Create and Attach PDF file from Memory Stream

问题描述

我必须将PDF文件作为附件发送，我有一个带有一些文本的HTML文件，我在运行时将数据库中的值添加到此文件中，就像这样

  var  path = Server.MapPath（ 〜/ StaticFile / UserDetails.htm）; 
  string  readFile = System.IO.File.ReadAllText（path）; 
 readFile.Replace（ ％Name％，username_from_db）; 
 readFile.Replace（ ％Age％，age_from_db）; 

现在我必须生成PDF文件并在运行时将其作为附件发送，我无法在物理上保存pdf文件。这就是我试过的内容

 System.IO.MemoryStream ms =  new  System.IO.MemoryStream（）; 
 System.IO.StreamWriter writer =  new  System.IO.StreamWriter（ms）; 
 writer.Write（readFile）; 
 

然后像这样附上它

系统。 Net.Mail.Attachment attach =  new  System.Net.Mail.Attachment（ms，  file.pdf）; 
 

但是当我把它作为附件发送时，它没有打开我在电子邮件中收到的文件。我也尝试了这个

 mailMessage.Attachments.Add（System.Net.Mail.Attachment.CreateAttachmentFromString（readFile，  application / pdf））; 
 mailMessage.Attachments.Last（）。ContentDisposition.FileName =   myFile.pdf; 

我也试过这个

  var  byts = GetBytes（readFile）; 
 System.IO.MemoryStream ms =  new  System.IO.MemoryStream（byts）; 
  var  att =  new  System.Net.Mail.Attachment（ms，  MyFile.pdf）; 
 mailMessage.Attachments.Add（att）; 
 
  private   static   byte  [] GetBytes（ string  str）
 {
  byte  [] bytes =  new   byte  [str.Length *  sizeof （ char ）]; 
 System.Buffer.BlockCopy（str.ToCharArray（）， 0 ，bytes， 0 ， bytes.Length）; 
  return 个字节; 
} 

但是我在电子邮件中收到它后没有打开pdf文件。

如何生成和发送PDF文件运行时？

解决方案

Garth是正确的，你无法打开PDF文件的原因是因为它不是一个有效的文件。您将 readFile 中的HTML文本写入 ms 流，然后将该流的内容附加为 file.pdf 。



您需要将HTML格式转换为PDF格式。尝试google-ing，这是一个有点常见的任务，你可以找到相当多的解决方案。

例如这里有一个解决方案（它使用iTextSharp）：

http://stackoverflow.com/questions/2822843/itextsharp-html- to-pdf＃answer-30555304 [ ^ ]

I have to send PDF file as attachement, I am having an HTML file with some text in it and I am adding values from database to this file at runtime, Like this

  var path = Server.MapPath("~/StaticFile/UserDetails.htm");
        string readFile = System.IO.File.ReadAllText(path);
readFile.Replace("%Name%",username_from_db);
readFile.Replace("%Age%",age_from_db);

Now I have to generate PDF file and send it as attachement on runtime,I cant save the pdf file physically.This is what I tried

System.IO.MemoryStream ms = new System.IO.MemoryStream();
               System.IO.StreamWriter writer = new System.IO.StreamWriter(ms);
              writer.Write(readFile);

then attaching it like this

System.Net.Mail.Attachment attach = new System.Net.Mail.Attachment(ms, "file.pdf");

but when I send it as attachement, it is not opening the file which I am getting in email. I also tried this

mailMessage.Attachments.Add(System.Net.Mail.Attachment.CreateAttachmentFromString(readFile, "application/pdf"));
              mailMessage.Attachments.Last().ContentDisposition.FileName = "myFile.pdf";

I have tried this too

 var byts = GetBytes(readFile);
System.IO.MemoryStream ms = new System.IO.MemoryStream(byts);
  var att = new System.Net.Mail.Attachment(ms, "MyFile.pdf");
mailMessage.Attachments.Add(att);

  private static byte[] GetBytes(string str)
        {
            byte[] bytes = new byte[str.Length * sizeof(char)];
            System.Buffer.BlockCopy(str.ToCharArray(), 0, bytes, 0, bytes.Length);
            return bytes;
        }

But its not opening the pdf file after I recieve it in email.
How can I generate and send PDF on runtime?

解决方案

Garth is correct, the reason why you're unable to open your "PDF" file is because it's not a valid file. You wrote a HTML text from readFile into a ms stream and then attached that stream's content as file.pdf.

You'll need to convert the HTML format into a PDF format. Try google-ing for this, this is a somewhat common task and you can find quite a few solutions to it.
For example here is one of those solutions (it uses iTextSharp):
http://stackoverflow.com/questions/2822843/itextsharp-html-to-pdf#answer-30555304[^]

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