MVC Exception based Http Error

HttpError.cs

using System;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Filters;

namespace kwd.gist
{
    public class HttpError : Exception
    {
        public HttpError(IActionResult result)
        {
            ErrorResult = result;
        }

        public IActionResult ErrorResult { get; private set; }
    }

    public class HttpErrorFilter : ExceptionFilterAttribute
    {
        public override void OnException(ExceptionContext context)
        {
            if (context.Exception is HttpError httpError)
            {
                context.Result = httpError.ErrorResult;
                context.ExceptionHandled = true;
            }
        }
    }
}