GBRSWN/CZKJ.GBRS2.Web/Controllers/HomeController.cs

using System.Diagnostics;
using Microsoft.AspNetCore.Mvc;
using CZKJ.GBRS2.Web.Models;
using Microsoft.AspNetCore.Hosting;
using System.IO;

namespace CZKJ.GBRS2.Web.Controllers
{
    public class HomeController : Controller
    {
        public IActionResult Index([FromServices] IHostingEnvironment env)
        {
            var path = Path.Combine(env.WebRootPath,"index.html");
            var fileStream = new FileStream(path, FileMode.Open, FileAccess.Read);
            return File(fileStream, "text/html");
        }

        public IActionResult About()
        {
            ViewData["Message"] = "Your application description page.";

            return View();
        }

        public IActionResult Contact()
        {
            ViewData["Message"] = "Your contact page.";

            return View();
        }

        public IActionResult Error()
        {
            return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
        }
    }
}