在浏览器中打开文件而不是下载它 [英] Make a file open in browser instead of downloading it

问题描述

我有一个 MVC 项目，它将向用户显示一些文档.文件当前存储在 Azure blob 存储中.

I have an MVC project that will display some documents to users. The files are currently stored in Azure blob storage.

目前，文档是从以下控制器操作中检索的:

Currently, the documents are retrieved from the following controller action:

[GET("{zipCode}/{loanNumber}/{classification}/{fileName}")]
public ActionResult GetDocument(string zipCode, string loanNumber, string classification, string fileName)
{
    // get byte array from blob storage
    byte[] doc = _docService.GetDocument(zipCode, loanNumber, classification, fileName);
    string mimeType = "application/octet-stream";
    return File(doc, mimeType, fileName);
}

现在，当用户点击如下链接时:

Right now, when a user clicks on a link like the following:

<a target="_blank" href="http://...controller//GetDocument?zipCode=84016&loanNumber=12345678classification=document&fileName=importantfile.pdf

然后，文件会下载到浏览器的下载文件夹中.我想要发生的(我认为是默认行为)是让文件简单地显示在浏览器中.

Then, the file downloads to their browser's downloads folder. What I would like to happen (and I thought was default behavior) is for the file to simply be displayed in the browser.

我尝试更改 mimetype 并将返回类型更改为 FileResult 而不是 ActionResult，但均无济于事.

I have tried changing the mimetype and changing the return type to FileResult instead of ActionResult, both to no avail.

如何让文件在浏览器中显示而不是下载?

How can I make the file display in the browser instead of downloading?

推荐答案

感谢所有的答案，解决方案是所有这些的组合.

Thanks to all the answers, the solution was a combination of all of them.

首先，因为我使用的是 byte[]，控制器动作需要是 FileContentResult 而不仅仅是 FileResult.发现这要归功于:有什么区别在 ASP.NET MVC 中的四个文件结果之间

First, because I was using a byte[] the controller action needed to be FileContentResult not just FileResult. Found this thanks to: What's the difference between the four File Results in ASP.NET MVC

其次，mime 类型不能是 octet-stream.据说，使用流会导致浏览器只下载文件.我不得不更改 application/pdf 类型.不过，我需要探索一个更强大的解决方案来处理其他文件/mime 类型.

Second, the mime type needed to NOT be a octet-stream. Supposedly, using the stream causes the browser to just download the file. I had to change the type application/pdf. I will need to explore a more robust solution to handle other file/mime types though.

第三，我必须添加一个将 content-disposition 更改为 inline 的标题.使用这篇文章我发现我必须修改我的代码防止重复标题，因为内容处置已经被设置为 attachment.

Third, I had to add a header that changed the content-disposition to inline. Using this post I figured out I had to modify my code to prevent duplicate headers, since the content-disposition was already being set to attachment.

成功代码:

public FileContentResult GetDocument(string zipCode, string loanNumber, string classification, string fileName)
{
    byte[] doc = _docService.GetDocument(zipCode, loanNumber, classification, fileName);
    string mimeType = "application/pdf"
    Response.AppendHeader("Content-Disposition", "inline; filename=" + fileName);
    return File(doc, mimeType);
} 

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