Localização em ASP.NET Core 3.1 MVC

Estou tentando adicionar localização ao meu projeto ASP.NET Core 3.1 MVC, infelizmente não consegui encontrar nenhum artigo ou tutorial que mostre como fazer isso de uma maneira fácil.

Cada um e todos estão tendo alguns problemas que eu não conseguia entender.

Alguém poderia me mostrar uma maneira fácil de fazer isso? ok, tentei fazer syncfusion.com/blogs/post/… mas enfrentei um problema com isso (options.RequestCultureProviders = new [] {new RouteDataRequestCultureProvider {IndexOfCulture = 1, IndexofUICulture = 1}};) diz que RequestCultureProviders não não tem IndexofUICulture ......

Eu alcancei este nível:

    @using Microsoft.AspNetCore.Localization
@using Microsoft.Extensions.Localization 
@using System.Resources 
@model Index
@inject IStringLocalizer<Index> localizer 
@inject IHtmlLocalizer<Index> htmlLocalizer
@{
    ViewData["Title"] = "M-POS";
    //Microsoft.AspNetCore.Localization.IRequestCultureFeature requestCultureFeature;
    var requestCulture = CultureInfo.CurrentCulture;
    

}
    <div class="text-center">
        <h1 class="display-4">@localizer["Welcome"]</h1>
        <p>@localizer["Learn"]</p>


        <table class="table culture-table">
            <tr>
                <td style="width:50%;">Culture</td>
                <td>@requestCulture.DisplayName {@requestCulture.Name}</td>
            </tr>
            <tr>
                <td>UI Culture</td>
                <td>@requestCulture.Name</td>
            </tr>
            <tr>
                <td>UICulture Parent</td>
                <td>@requestCulture.Parent</td>
            </tr>
            <tr>
                <td>Date</td>
                <td>@DateTime.Now.ToLongDateString()</td>
            </tr>
            <tr>
                <td>Currency</td>
                <td>
                    @(12345.00.ToString("c"))
                </td>
            </tr>
            <tr>
                <td>Currency</td>
                <td>
                    @(12345.00.ToString("c"))
                </td>
            </tr>
            <tr>
                <td>Number</td>
                <td>
                    @(123.45m.ToString("F2"))
                </td>
            </tr>
        </table>
    </div>

e então eu tenho uma pasta chamada Resources dentro dessa pasta eu tenho um arquivo chamado Resource.resx e Resource.en-US.resx e o arquivo StartUp.cs é assim:

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.HttpsPolicy;
using Microsoft.EntityFrameworkCore;
using POS3.Data;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Models;
using Microsoft.AspNetCore.Identity.UI.Services;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc.Authorization;
using Microsoft.AspNetCore.Mvc.Razor;
using System.Globalization;
using Microsoft.AspNetCore.Localization;
using Microsoft.Extensions.Options;
using Microsoft.AspNetCore.Localization.Routing;
using Microsoft.AspNetCore.Routing;
using Microsoft.CodeAnalysis.Options;

using Microsoft.AspNetCore.Http;
using System.Xml.Linq;

namespace POS3
{
    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.AddDbContext<ApplicationDbContext>(options =>
              options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));

            services.AddDefaultIdentity<UserAccount>()
                .AddRoles<IdentityRole>()
                .AddEntityFrameworkStores<ApplicationDbContext>();

            services.AddRazorPages();
            //localization startup

            services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
            services.AddLocalization(options => options.ResourcesPath = "Resources");
            services.AddMvc().AddViewLocalization();
            services.AddMvc()
            .AddViewLocalization(options => options.ResourcesPath = "Resources")
            .AddDataAnnotationsLocalization();

            

            services.Configure<RequestLocalizationOptions>(options =>
            {
                var supportedCultures = new[]
                 {
                    
                    new CultureInfo("ar-SA"),
                    new CultureInfo("en-US")
                };
                options.DefaultRequestCulture = new RequestCulture("en-US");
                options.SupportedCultures = supportedCultures;
                options.SupportedUICultures = supportedCultures;
            });

            //services.Configure<RequestLocalizationOptions>(options =>
            //{
            //    var supportedCultures = new[]
            //    {
            //    new CultureInfo("en-US"),
            //    new CultureInfo("ar-SA"),
            //    new CultureInfo("es"),
            //};

            //    options.DefaultRequestCulture = new RequestCulture("en-US");
            //    options.SupportedCultures = supportedCultures;
            //    options.SupportedCultures = supportedCultures;
            //    //options.RequestCultureProviders = new[] { new RouteDataRequestCultureProvider { IndexOfCulture = 1, IndexOfCulture = 1 } };
            //});




            services.AddMvcCore();
            services.AddAuthorization(options => {
                options.AddPolicy("readonlypolicy",
                    builder => builder.RequireRole("Admin", "Manager", "Cashier", "User", "Super User"));
                options.AddPolicy("writepolicy",
                    builder => builder.RequireRole("Admin", "Manager", "Super User"));
            });

            

              


            services.Configure<IdentityOptions>(options =>
            {
                // Default Password settings.
                options.Password.RequireDigit = false;
                options.Password.RequiredLength = 6;
                options.Password.RequiredUniqueChars = 1;
                options.Password.RequireNonAlphanumeric = false;
                options.Password.RequireUppercase = false;
                options.Password.RequireLowercase = false;
            });

            services.AddControllersWithViews();
            services.AddRazorPages();
            services.AddControllers(config =>
            {
                
                var policy = new AuthorizationPolicyBuilder()
                                 .RequireAuthenticatedUser()
                                 .Build();
                config.Filters.Add(new AuthorizeFilter(policy));
            });

            services.Configure<PasswordHasherOptions>(options =>
            options.CompatibilityMode = PasswordHasherCompatibilityMode.IdentityV2
            );
            


            //services.AddSingleton<IEmailSender, EmailSender>();
        }

        // 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();
                app.UseDatabaseErrorPage();
            }
            else
            {
                app.UseExceptionHandler("/Home/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.UseRouting();

            //configer localization
            


            var localizationOptions = app.ApplicationServices.GetService<IOptions<RequestLocalizationOptions>>().Value;
            app.UseRequestLocalization(localizationOptions);

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

           
        }
    }
}

agora não consigo ver os valores do arquivo resource.en-US.resx. Acho que algo está faltando.

Q1: um problema com este (options.RequestCultureProviders = new [] {new RouteDataRequestCultureProvider {IndexOfCulture = 1, IndexofUICulture = 1}};) diz que RequestCultureProviders não tem IndexofUICulture ......

Baixe os exemplos que você encontrará RouteDataRequestCultureProvider.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Localization;

namespace LocalizationSampleSingleResxFile
{
    public class RouteDataRequestCultureProvider : RequestCultureProvider
    {
        public int IndexOfCulture;
        public int IndexofUICulture;

        public override Task<ProviderCultureResult> DetermineProviderCultureResult(HttpContext httpContext)
        {
            if (httpContext == null)
                throw new ArgumentNullException(nameof(httpContext));

            string culture = null;
            string uiCulture = null;

            culture = uiCulture = httpContext.Request.Path.Value.Split('/')[IndexOfCulture]?.ToString();

            var providerResultCulture = new ProviderCultureResult(culture, uiCulture);

            return Task.FromResult(providerResultCulture);
        }
    }
}

P2: Altere o nome do seu recurso

Você já nomeou en-US, portanto, o nome do arquivo de recurso deve ser formatado com en-US.

Index.cshtml:

Capturas de tela do teste:

Globalização e localização no ASP.NET Core
Adicionando localização a um aplicativo ASP.NET Core
Como usar a localização em uma API da Web ASP.NET Core