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

问题描述

我正在使用第三方软件从 html 文档呈现 PDF.我创建了一个小型测试项目，并使用 <asp:Button> 的 OnClick 事件，我能够从目录中读取 html 文档并将其呈现为 PDF没有问题.

响应创建如下:

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();

当我在 Chrome 中查看响应时，可以看到 Content-Type 设置正确:

<块引用>

内容处理:内联；文件名=HtmlToPdf.pdf;

内容长度:101482

内容类型:应用程序/pdf

我已尝试将上述内容转移到我当前的项目中.唯一的区别是我在 DevExpress 网格视图中使用了一个自定义按钮，而不是一个 .我最初在回调面板中处理自定义按钮单击，但未设置 Content-Type.在 Chrome 中查看响应证明了这一点:

<块引用>

内容处理:内联；文件名=5.pdf;

内容编码:gzip

内容长度:149015

内容类型:文本/普通；字符集=utf-8

我也尝试过使用 gvDocuments.CustomButtonCallback += new ASPxGridViewCustomButtonCallbackEventHandler(gvDocuments_CustomButtonCallback); 事件，但仍未设置 Content-Type.

有人对为什么我不能在上述情况下设置 Content-Type 有任何想法吗?

解决方案

你可以试试

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

<块引用>

response.ContentType = "application/pdf";

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

希望它有效:)

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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