Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Identity.UI;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using RazorPages.WebApp.Data;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using cloudscribe.Web.SiteMap;
using Microsoft.Extensions.Hosting;
using System.Globalization;
using Microsoft.AspNetCore.Mvc.Razor;
using Microsoft.AspNetCore.Localization;
using cloudscribe.Web.Navigation.Caching;

namespace RazorPages.WebApp
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddScoped<ITreeCache, MemoryTreeCache>();

            services.AddScoped<ISiteMapNodeService, NavigationTreeSiteMapNodeService>();
            services.AddCloudscribeNavigation(Configuration.GetSection("NavigationOptions"));



            services.Configure<CookiePolicyOptions>(options =>
            {
                // This lambda determines whether user consent for non-essential cookies is needed for a given request.
                options.CheckConsentNeeded = context => true;
                options.MinimumSameSitePolicy = SameSiteMode.None;
            });

            services.AddDbContext<ApplicationDbContext>(options =>
                options.UseSqlServer(
                    Configuration.GetConnectionString("DefaultConnection")));
            services.AddDefaultIdentity<IdentityUser>()
                .AddDefaultUI(UIFramework.Bootstrap4)
                .AddEntityFrameworkStores<ApplicationDbContext>();

            services.AddControllersWithViews();
            services.AddRazorPages();

            var supportedCultures = new[]
               {
                     new CultureInfo("en-US"),
                     new CultureInfo("es-ES"),
                     new CultureInfo("fr-FR"),
                     new CultureInfo("de-DE"),
                     new CultureInfo("hi-IN"),  //Hindi
                     new CultureInfo("ru-RU"),
                     new CultureInfo("zh-Hans"), //Chinese Simplified
                     new CultureInfo("zh-Hant"), //Chinese Traditional
                };

            //var routeSegmentLocalizationProvider = new FirstUrlSegmentRequestCultureProvider(supportedCultures.ToList());

            services.Configure<RequestLocalizationOptions>(options =>
            {


                // State what the default culture for your application is. This will be used if no specific culture
                // can be determined for a given request.
                options.DefaultRequestCulture = new RequestCulture(culture: "en-US", uiCulture: "en-US");

                // You must explicitly state which cultures your application supports.
                // These are the cultures the app supports for formatting numbers, dates, etc.
                options.SupportedCultures = supportedCultures;

                // These are the cultures the app supports for UI strings, i.e. we have localized resources for.
                options.SupportedUICultures = supportedCultures;

                // You can change which providers are configured to determine the culture for requests, or even add a custom
                // provider with your own logic. The providers will be asked in order to provide a culture for each request,
                // and the first to provide a non-null result that is in the configured supported cultures list will be used.
                // By default, the following built-in providers are configured:
                // - QueryStringRequestCultureProvider, sets culture via "culture" and "ui-culture" query string values, useful for testing
                // - CookieRequestCultureProvider, sets culture via "ASPNET_CULTURE" cookie
                // - AcceptLanguageHeaderRequestCultureProvider, sets culture via the "Accept-Language" request header
                //options.RequestCultureProviders.Insert(0, new CustomRequestCultureProvider(async context =>
                //{
                //  // My custom request culture logic
                //  return new ProviderCultureResult("en");
                //}));

                //options.RequestCultureProviders.Insert(0, routeSegmentLocalizationProvider);

            });

            services.AddMvc()
                .AddViewLocalization(LanguageViewLocationExpanderFormat.Suffix)
                .AddDataAnnotationsLocalization()
                .AddRazorOptions(options => {});


        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
                
            }
            else
            {
                app.UseExceptionHandler("/Error");
                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
                app.UseHsts();
            }

            app.UseHttpsRedirection();
            app.UseStaticFiles();
            app.UseCookiePolicy();

            app.UseRouting();

            app.UseAuthentication();
            app.UseAuthorization();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllerRoute(
                    name: "default",
                    pattern: "{controller=Home}/{action=Index}/{id?}");
                endpoints.MapRazorPages();
            });

        }
    }
}