为什么app只返回一种受支持的文化？

Question

我尝试在我的网站上创建语言切换。我在Startup中添加了文化：

IList<CultureInfo> supportedCultures = new List<CultureInfo>
{
    new CultureInfo("ru"),
    new CultureInfo("uk"),
};
var localizationOptions = new RequestLocalizationOptions
{
    DefaultRequestCulture = new RequestCulture("uk"),
    SupportedCultures = supportedCultures,
    SupportedUICultures = supportedCultures
};
var requestProvider = new RouteDataRequestCultureProvider();
localizationOptions.RequestCultureProviders.Insert(0, requestProvider);
app.UseRequestLocalization(localizationOptions);

本地化工作。但是当我尝试在Razor中获得支持的文化列表时，它只返回一种文化。我究竟做错了什么？

Answer 1

public class Startup
{
    public Startup(IConfiguration configuration, IHostingEnvironment environment)
    {
        Configuration = configuration;
        HostingEnvironment = environment;
    }

    public IConfiguration Configuration { get; }
    public IHostingEnvironment HostingEnvironment { get; }

    public void ConfigureServices(IServiceCollection services)
    {
        services.AddLocalization(options => options.ResourcesPath = "Resources");

        services.AddMvc()
            .SetCompatibilityVersion(CompatibilityVersion.Version_2_1)
            .AddViewLocalization(LanguageViewLocationExpanderFormat.Suffix)
            .AddDataAnnotationsLocalization();

        services.Configure<RequestLocalizationOptions>(options =>
        {
            var supportedCultures = new[]
            {
                new CultureInfo("ru"),
                new CultureInfo("uk")
            };

            options.DefaultRequestCulture = new RequestCulture("uk");
            options.SupportedCultures = supportedCultures;
            options.SupportedUICultures = supportedCultures;
            options.RequestCultureProviders.Insert(0, new RouteDataRequestCultureProvider());
        });
    }

    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        var localizationOptions= app.ApplicationServices.GetService<IOptions<RequestLocalizationOptions>>().Value;
        app.UseRequestLocalization(localizationOptions);
    }
}