"Conventional" exception handling in ASP.NET MVC

ExceptionHandlerFilter .cs

public class ExceptionHandlerFilter : IExceptionFilter
{
    ...
    public void OnException(ExceptionContext context)
    {
        // Are you kidding me???
        var controllerDescriptor = (ControllerDescriptor)new ReflectedControllerDescriptor(context.Controller.GetType());
        var actionDescriptor = (ReflectedActionDescriptor)controllerDescriptor.FindAction(context, context.RouteData.Values["action"].ToString());

        if (actionDescriptor.MethodInfo.ReturnType == typeof(JsonResult))
        {
            // Set the status code for JsonResults
        }
        else
        {
            // Redirect to error page for ViewResults
        }
        context.ExceptionHandled = true;
    }
}