How to return error message from FileResult method in asp.net MVC 4 application?

问题

I have a fileresult method in asp.net mvc4 that returns a report in an excel file. Now how can i return an error message from this method if my conditions are not met !! Since we can only return a file from this method ?! Thnks

回答1:

You can change signature of action method to public ActionResult MyMethod() and return FileResult when ModelState.IsValid==true and ViewResult when ModelState.IsValid==false

来源：https://stackoverflow.com/questions/12276044/how-to-return-error-message-from-fileresult-method-in-asp-net-mvc-4-application