Question

I have this controller method in my FilesController:

public ActionResult Download(int id, string filename)
{
    var file = _filesRepository.GetFile(id);

    // Write it back to the client
    Response.ContentType = file.FileMimeType;
    Response.AddHeader("content-disposition", "attachment; filename=" + file.FileName);
    Response.BinaryWrite(file.FileData);

    return new EmptyResult();
}

This works if I navigate to

/Files/Download/123?filename=myimage.png

But I’d like it work if I navigate to

/Files/Download/123/myimage.png

I know I need to create a custom route for this, but everything I’ve tried isn’t working. I’d like it to accept two parameters for only the FilesController and Download method. Is that possible?

Answer 1

Yes, this is very easy if you create a new route. In your Global.asax.cs file, before the default route, add the following route:

routes.MapRoute(
  "FileDownload", // Route name
  "Files/Download/{id}/{filename}", // URL with parameters
  new { 
    controller = "Files", 
    action = "Download", 
    id = UrlParameter.Optional, 
    filename = UrlParameter.Optional 
  } // Parameter defaults
);

Then your controller action should work as you currently have it defined.