AspNetCore.Docs/aspnetcore/fundamentals/localization/sample/Startup.cs

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Threading.Tasks;
using Localization.StarterWeb.Models;
using Localization.StarterWeb.Services;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using Microsoft.AspNetCore.Localization;
using Microsoft.AspNetCore.Mvc.Razor;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;

namespace Localization.StarterWeb
{
    public class Startup
    {
        public Startup(IHostingEnvironment env)
        {
            var builder = new ConfigurationBuilder()
                .SetBasePath(env.ContentRootPath)
                .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
                .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
                .AddEnvironmentVariables();
            Configuration = builder.Build();
        }

        public IConfigurationRoot 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["Data:DefaultConnection:ConnectionString"])
            );

            services.AddIdentity<ApplicationUser, IdentityRole>()
                .AddEntityFrameworkStores<ApplicationDbContext>()
                .AddDefaultTokenProviders();

            services.AddLocalization(options => options.ResourcesPath = "Resources");

            services.AddMvc()
              .AddViewLocalization(LanguageViewLocationExpanderFormat.Suffix)
              .AddDataAnnotationsLocalization();

            services.AddTransient<IEmailSender, AuthMessageSender>();
            services.AddTransient<ISmsSender, AuthMessageSender>();

            // Configure supported cultures and localization options
            /*
            services.Configure<RequestLocalizationOptions>(options =>
            {
                var supportedCultures = new[]
                {
                    new CultureInfo("en-US"),
                    new CultureInfo("fr")
                };

                // 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");
                //}));
            });
            */


        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            loggerFactory.AddConsole(Configuration.GetSection("Logging"));
            loggerFactory.AddDebug();

            if (env.IsDevelopment())
            {
                app.UseBrowserLink();
                app.UseDeveloperExceptionPage();
                app.UseDatabaseErrorPage();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");

                // For more details on creating database during deployment see http://go.microsoft.com/fwlink/?LinkID=615859
                try
                {
                    using (var serviceScope = app.ApplicationServices.GetRequiredService<IServiceScopeFactory>()
                        .CreateScope())
                    {
                        serviceScope.ServiceProvider.GetService<ApplicationDbContext>()
                             .Database.Migrate();
                    }
                }
                catch { }
            }

            var supportedCultures = new[]
            {
                new CultureInfo("en-US"),
                new CultureInfo("en-AU"),
                new CultureInfo("en-GB"),
                new CultureInfo("en"),
                new CultureInfo("es-ES"),
                new CultureInfo("es-MX"),
                new CultureInfo("es"),
                new CultureInfo("fr-FR"),
                new CultureInfo("fr"),
            };

            app.UseRequestLocalization(new RequestLocalizationOptions
            {
                DefaultRequestCulture = new RequestCulture("en-US"),
                // Formatting numbers, dates, etc.
                SupportedCultures = supportedCultures,
                // UI strings that we have localized.
                SupportedUICultures = supportedCultures
            });

            app.UseStaticFiles();

            app.UseIdentity();

            // To configure external authentication please see http://go.microsoft.com/fwlink/?LinkID=532715

            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Home}/{action=Index}/{id?}");
            });
        }
    }
}