ASP.Net Core Content-Disposition attachment/inline

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The best way I have found is to add the content-disposition headers manually.

private IActionResult GetFile(int id)
{
       var file = $"folder/{id}.pdf";

       // Response...
       System.Net.Mime.ContentDisposition cd = new System.Net.Mime.ContentDisposition
       {
              FileName = file,
              Inline = displayInline  // false = prompt the user for downloading;  true = browser to try to show the file inline
       };
       Response.Headers.Add("Content-Disposition", cd.ToString());
       Response.Headers.Add("X-Content-Type-Options", "nosniff");

       return File(System.IO.File.ReadAllBytes(file), "application/pdf");
}

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