How can I raise an http 404 from a FileStreamResult?

Question

Normally I'd return HttpNotFound() but my method returns a FileStreamResult and I get

Cannot implicitly convert type 'System.Web.Mvc.HttpNotFoundResult' to 'System.Web.Mvc.FileStreamResult'

When I try to build. Is there an alternative version for file results?

Answer 1

Type your action method to return the base ActionResult rather than the specific FileStreamResult. Then you can return whatever you want.

Answer 2

You could throw an HttpException.

throw new HttpException(404, "Not found");