Redirect To Action MVC convert to FILE RESULT

Question

This is my code for Download a File in my MVC App. Im having a weird error and I cant a way to put it right. The error is > Cannot implicitly convert type 'System.Web.Mvc.RedirectToRouteResult' to 'System.Web.Mvc.FileResult'

What I want with this code is, that while theres a file download it, but if theres not file(null) then it just dont do nothing or dont return nothing

 public FileResult Download(string Doc)
 {

    string fullPath = Path.Combine(Server.MapPath("~/UploadFiles/"), Doc);

    if (fullPath == null)
    {
        byte[] fileBytes = System.IO.File.ReadAllBytes(fullPath);

        return File(fileBytes, System.Net.Mime.MediaTypeNames.Application.Octet, Doc);
    }

        return RedirectToAction("List");
         }

Answer 1

Change your action method return type to ActionResult

Both RedirectResult and FileResult are inheriting from this ActionResult abstract class.

Also your if condition does not makes sense! It will always be false as the Path.Combine will give you a non null string value. May be you want to check the file exist in the disk ?

public ActionResult Download(string Doc)
{    
    string fullPath = Path.Combine(Server.MapPath("~/UploadFiles/"), Doc);

    if (System.IO.File.Exists(fullPath))
    {
        byte[] fileBytes = System.IO.File.ReadAllBytes(fullPath);

        return File(fileBytes, System.Net.Mime.MediaTypeNames.Application.Octet, Doc);
    }
    return RedirectToAction("List");
}

Your code should be compilable now.