Generic Entry Controller Action

namespace Root.Apps.Web.Csweb.Controllers
{
    using System;
    using System.Diagnostics;

    using Microsoft.AspNetCore.Mvc;
    using Microsoft.Extensions.Logging;

    using Contentstack.Core;

    using Deliverystack.Core;
    using Deliverystack.Core.Models.Repositories;

    using Root.Apps.Web.Csweb.Models;
    using Root.Core.Models.Entries;

    public class EntryController : Controller
    {
        private readonly ILogger<EntryController> _logger;
        private IRepository _repository;
        private ContentstackClient _stack;

        public EntryController(
            IRepository repository,
            ILogger<EntryController> logger,
            ContentstackClient stack)
        {
            _repository = repository;
            _logger = logger;
            _stack = stack;
        }

        public IActionResult Privacy()
        {
            return View();
        }

        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
        public IActionResult Error()
        {
            return View("Error", new ErrorViewModel {RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier});
        }

        public IActionResult Index(string url)
        {
            if (string.IsNullOrEmpty(url) || !url.StartsWith("/"))
            {
                url = "/" + url;
            }

            new Instrument(_logger).Track(this, "INSIDE CONTROLLER");

//            new Instrument().Track(this, "Index({0})", url);
            WebpageEntry? entryModel = null;

            // url == HttpContext.Request.Path
            try
            {
                entryModel = _repository.GetEntryModel(url) as WebpageEntry;

                if (entryModel == null)
                {
                    new Instrument().Warn(this, "Unable to locate entry by URL: {0}", url);
                }
            }
            catch (Exception ex)
            {
                throw ex;
                //                new Instrument().Exception(this, ex, "exception retrieving entry model for {0} : ", url); //TODO: ilogger
//                Console.WriteLine(ex + " : " + ex.Message);
                //To see the exception in the browser in development throw ex;
//                return Error();
            }

            if (entryModel != null)
            {
                //TODO: why is .ContentTypeUid empty/null here?
//                new Instrument().Debug(this, "model for {0} [{1}] : {2}", url, entryModel.ContentTypeUid, entryModel);

                if (!String.IsNullOrEmpty(entryModel.PageData.View))
                {
                    return View(entryModel.PageData.View, entryModel);
                }

                return View(entryModel);
            }
            else
            {
//                throw new HttpException(404, "Not Found");
 //               Response.Clear();
  //              Response.StatusCode = 404;
    //           Response.End();
            }

            return View("index");
        }
    }
}