How to use Exception filters in MVC 5

Question

How i can implement Exception Filters in MVC5.

I want to throw the exception to NLog and redirect the page to a default error page which displays \"Something is gone

Answer 1

Exception filters are run only when unhandled exception has been thrown inside an action method. As you asked, here is an example to redirect to another page upon exception:

public class MyExceptionAttribute : FilterAttribute, IExceptionFilter
{
    public void OnException(ExceptionContext filterContext)
    {
        if(!filterContext.ExceptionHandled)
        {
            filterContext.Result = new RedirectResult("~/Content/ErrorPage.html");
            filterContext.ExceptionHandled = true;
        }    
    }
}

Now, to apply this filter to either controllers or individual actions, put [MyException] on them.

You may need to check the occurence of an specific Exception inside the if clause. e.g.:

if(... && filterContext.Excaption is ArgumentOutOfRangeException)

To return a View as Exception Response:

filterContext.Result = new RedirectResult("/Home/ErrorAction");

other alternatives you might use to redirect are:

• new RedirectToRouteResult{ ... }
• new ViewResult{ ... }