ASP.NET - 发送PDF用户 [英] ASP.NET - Sending a PDF to the user

问题描述

我有一个创建PDF的过程。我希望这些PDF文件是暂时的和短暂的。我希望能够执行下列操作，当用户点击一个按钮：

 字符串CreatePDF（）//返回fileName.pdf
PromptUserToDownloadPDF（）
DeletePDF（fileName.pdf）
 

我想避免创建净化程序和处理来自用户同时创建PDF的同时运行清理​​出现的任何竞争条件。

在的WinForms，我会同步提示用户下载文件。我怎样才能做一个类似任务的网站的？

更新

请注意，我使用的是第三方应用程序来创建PDF文件（的Apache FOP ）。基本上我（会）有调用命令行功能：

  

C：> FOPinputfile中，输出.pdf

所以，记忆不是一个选项...这是除非我能以某种方式做喜欢....

 字符串CreatePDF（）//返回fileName.pdf
串RecreatePDFInMemory（）
DeletePDF（fileName.pdf）
PromptUserToDownloadPDF（）
 

解决方案

事情是这样的：

 字节[] = _pdfbytes CreatePDF（）;
Response.ContentType =应用程序/ PDF
Response.AppendHeader（内容长度，_pdfbytes.Length.ToString（））;
Response.BinaryWrite（_pdfbytes）;
 

由于这在内存中创建PDF，您不必担心清理工作。

修改为OP的编辑：

这在 CreatePDF ，您可以使用<一个href=\"http://msdn.microsoft.com/en-us/library/system.io.path.gettempfilename.aspx\"><$c$c>Path.GetTempFileName创建一个临时文件并执行花花公子写入该文件。删除文件立即返回字节之前[] 。我建议这样做删除最后区块内。不过，Fop的不支持有其管道输出到标准输出。具有 CreatePDF 函数抢这可能是更清洁。

I have a process that creates a PDF. I want these PDF's to be temporary and short lived. I want to be able to perform the following when the user clicks a button:

string CreatePDF()//returns fileName.pdf
PromptUserToDownloadPDF()
DeletePDF(fileName.pdf)

I want to avoid having to create a cleanup procedure and deal with any race conditions that arise from users concurrently creating PDF's while running cleanup.

In winforms, I would synchronously prompt a user to download a file. How can I do a similar task in web?

UPDATE
Please note that I am using a 3rd party app to create the PDF's (Apache FOP). Basically I (will) have a function that invokes the command line:

C:>fop "inputfile" "output.pdf"

So, in memory is not an option...that is unless I could somehow do like....

string CreatePDF()//returns fileName.pdf
string RecreatePDFInMemory()
DeletePDF(fileName.pdf)
PromptUserToDownloadPDF()

解决方案

Something like this:

byte[] _pdfbytes = CreatePDF();
Response.ContentType = "application/pdf";
Response.AppendHeader("Content-Length", _pdfbytes.Length.ToString());
Response.BinaryWrite(_pdfbytes);

Since this creates the PDF in memory, you don't need to worry about cleanup.

Edit for OP's edit:

From within CreatePDF, You can use Path.GetTempFileName to create a temp file and execute "fop" to write to that file. Delete that file immediately before returning the byte[]. I recommend doing this delete inside of a finally block. However, "Fop" does support having its output piped to stdout. Having the CreatePDF function grab that is probably cleaner.

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