How do I create download link to a file outside of blazor project.

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I have data drive with folders of .mp3 files with .csv as database (written by another program to a data drive)

I created a Blazor Server app that displays the .csv data in a table, including the path to the file. How can I create a link in the table to download the file since it is not in the wwwroot folder?

What I have tried:

I have looked into UseStaticFiles and got lost understanding offering downloads with an API.

Would anyone suggest I continue with either, or possibly another way?

Posted 23-Jul-23 7:02am

NewButTryingHard

Updated 24-Jul-23 5:59am

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Dave Kreskowiak · Answer 1 · 2023-07-23T10:46:00

Solution 1

You cannot create a link direct to a file outside the apps own directory. This is for security reasons.

You can, however, create a link to a code on the server-side to tell it which file to download and that code would have to read the file and return it. The server-side code would have to build the path and the account running your code on the server would have to have proper permissions to the folder containing your files to download.

Posted 23-Jul-23 10:46am

Dave Kreskowiak

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NewButTryingHard 24-Jul-23 13:58pm

Thank you. I have been really googling "read the file and return it". I believe that would look something like:

@code {
public Byte[] DownloadFile()
{
Byte[] bytes = File.ReadAllBytes("D:\\Recordings\\a.mp3");

return File(bytes, "audio/mp3");
}
}

Am I even in the ballpark?

Dave Kreskowiak 24-Jul-23 16:07pm

I haven't done Blazor anything yet so I don't know. What happens when you try it?