使用.NET Core Razor页面将文件下载到浏览器

问题描述：

我正在尝试使用ASP.NET Razor Pages将文件下载到浏览器.在Page(html)中，使用这样的链接可以正常工作:

Using ASP.NET Razor Pages, I am trying download a file to the browser. From the Page(html), using a link like this works fine:

href="/DownloadableFiles/testB.csv" download="newname">Download Link

但是，我想从代码隐藏或 ViewModel 开始下载，这样就可以动态了解文件名，我还需要先检查文件，等等.

However, I want to initiate the download from the code-behind or ViewModel so it can be dynamic as to what the filename is, I also need to inspect the file first, etc.

在ASP.NET MVC核心(不是RazorPages)中，您可以使用以下代码下载文件:

In ASP.NET MVC core, (not RazorPages) you can download a file in code using:

return File(memory, GetContentType(path), Path.GetFileName(path));

但是Razor页面中不支持返回文件.

But return File is not supported in Razor Pages.

答

pitaridis是正确的，Razor Pages中存在 return File ，我必须缺少命名空间.这将从代码隐藏"中下载文件:

pitaridis is correct, return File exists in Razor Pages, I must have been missing a namespace. This will download a file from Code Behind:

在页面中，这是提交"按钮:

In the page, here's the submit button:

<button type="submit" asp-page-handler="DownloadFile" style="width:75px" 
        class="cancel"> Download </button>

在PageModel中(后面的代码):

In the PageModel (code behind):

public ActionResult OnPostDownloadFile()
{
    return File("/DownloadableFiles/TestFile34.csv", "application/octet-stream", 
                "NewName34.csv");
}

注意:/DownloadableFiles位于wwwroot的子文件夹中

Note: /DownloadableFiles is in a subfolder of wwwroot

使用.NET Core Razor页面将文件下载到浏览器

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