HttpContext.Current.Response.AddHeader（）不设置Content-Type头 [英] HttpContext.Current.Response.AddHeader() not setting Content-Type header

问题描述

我使用第三方软件来呈现从HTML文档的PDF文件。我创建了一个小的测试项目，并使用的的OnClick 事件的< ASP：按钮> 我能读从目录的html文件，并使其作为一个没有问题的PDF

的响应创建如下：

  HttpContext.Current.Response.Clear（）; 
 HttpContext.Current.Response.AddHeader（内容类型，应用程序/ PDF格式）; 
 HttpContext.Current.Response.AddHeader（内容处置，
的String.Format（{0};文件名=的test.pdf;，内联））; 
 HttpContext.Current.Response.BinaryWrite（pdfBuffer）; 
 HttpContext.Current.ApplicationInstance.CompleteRequest（）; 
  

当我看着在Chrome的反应，我可以看到，内容类型被设置正确：

内容处置：内联;文件名= HtmlToPdf.pdf;

内容长度：101482

内容类型：应用程序/ PDF

我试过上面转移到我的当前项目。唯一的区别是，而不是一个< ASP：按钮> 我使用的DevExpress网格视图内的自定义按钮。我最初处理的自定义按钮点击在回调面板，但内容类型没有被设置的。在Chrome中浏览的响应证明了这一点：

内容处置：内联;文件名= 5.pdf;

内容编码：gzip

内容长度：149015

的Content-Type：text / plain的;字符集= UTF-8

我已经使用也试过gvDocuments.CustomButtonCallback + =新ASPxGridViewCustomButtonCallbackEventHandler（gvDocuments_CustomButtonCallback ）; 事件，但内容类型仍然没有被设置

任何人有任何想法，为什么我不能在设置内容类型上面的场景？

解决方案

您可以尝试

 的HttpResponse响应= HttpContext.Current.Response; 
 response.ClearContent（）; 
 response.Clear（）; 
  

response.ContentType =应用程序/ PDF格式;

  response.AddHeader（内容处置，附件;文件名=+ yourFileName +.PDF ）; 
 stream.WriteTo（response.OutputStream）; 
 response.Flush（）; 
到Response.End（）; 
  

希望工程：）

I'm using third-party software to render PDFs from html documents. I created a small test project and using the OnClick event of an <asp:Button> I was able to read a html document from a directory and render it as a PDF with no problems.

The response is created as follows:

HttpContext.Current.Response.Clear();
HttpContext.Current.Response.AddHeader("Content-Type", "application/pdf");
HttpContext.Current.Response.AddHeader("Content-Disposition", 
    String.Format("{0}; filename=Test.pdf;", "inline" ));
HttpContext.Current.Response.BinaryWrite(pdfBuffer);
HttpContext.Current.ApplicationInstance.CompleteRequest();

When I look at the response in Chrome, I can see that Content-Type is being set correctly:

Content-Disposition:inline; filename=HtmlToPdf.pdf;

Content-Length:101482

Content-Type:application/pdf

I've tried to transfer the above to my current project. The only difference being that instead of one <asp:Button> I'm using a custom button inside a DevExpress grid view. I Initially handled the custom button click in a callback panel, but Content-Type was not being set. Viewing the response in Chrome proved this:

Content-Disposition:inline; filename=5.pdf;

Content-Encoding:gzip

Content-Length:149015

Content-Type:text/plain; charset=utf-8

I've also tried using the gvDocuments.CustomButtonCallback += new ASPxGridViewCustomButtonCallbackEventHandler(gvDocuments_CustomButtonCallback); event but Content-Type is still not being set.

Anyone have any ideas as to why I cannot set Content-Type in the above scenario?

解决方案

You can try

HttpResponse response = HttpContext.Current.Response;
response.ClearContent();
response.Clear();

response.ContentType = "application/pdf";

response.AddHeader("Content-Disposition", "attachment; filename=" + yourFileName + ".pdf");
stream.WriteTo(response.OutputStream);
response.Flush();
response.End();

hope it works :)

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