Create sitemap in kentico 13

using Business.Services;

using Core.Configuration;

using Microsoft.AspNetCore.Mvc;

using Microsoft.Extensions.Localization;

using Microsoft.Extensions.Logging;

using Microsoft.Extensions.Options;

using SimpleMvcSitemap;

using System;

using System.Collections.Generic;

using XperienceAdapter.Localization;

namespace ABC.Controllers

{

    [Route("googlesitemap.xml", Name = "GoogleSitemap")]

    public class GoogleSitemapController : BaseController

    {

        private readonly ISitemapServices _sitemapServices;

        public GoogleSitemapController(ILogger<BaseController> logger,

            IOptionsMonitor<XperienceOptions> optionsMonitor,

            IStringLocalizer<SharedResource> stringLocalizer,

            ISitemapServices sitemapServices) : base(logger, optionsMonitor, stringLocalizer)

        {

            _sitemapServices = sitemapServices ?? throw new ArgumentNullException(nameof(sitemapServices));

        }

        public IActionResult Index()

        {

            var contentMultiple = _sitemapServices.GetContentAsync(

                       _optionsMonitor.CurrentValue.CacheInSeconds,

                       null

                       );

            List<SitemapNode> nodes = new List<SitemapNode>();

            foreach (var doc in contentMultiple.Result)

            {

                nodes.Add(new SitemapNode(doc.NodeAliasPath)

                {

                    LastModificationDate = (doc.DocumentModifiedWhen.Date)

                });

            }

            return new SitemapProvider().CreateSitemap(new SitemapModel(nodes));

        }

    }

}