SupportedUICultures 不显示所有文化

Question

我按照这个文档在我的ASP.NET Core应用程序中实现本地化，我试图在页脚中显示一个包含我的应用程序支持的所有语言的选择。

所以我_SelectLanguagepartial按照文档的建议创建了一个文件：

@using Microsoft.AspNetCore.Builder
@using Microsoft.AspNetCore.Http.Features
@using Microsoft.AspNetCore.Localization
@using Microsoft.AspNetCore.Mvc.Localization
@using Microsoft.Extensions.Options

@inject IViewLocalizer Localizer
@inject IOptions<RequestLocalizationOptions> LocOptions

@{
    var requestCulture = Context.Features.Get<IRequestCultureFeature>();
    var cultureItems = LocOptions.Value.SupportedUICultures
        .Select(c => new SelectListItem { Value = c.Name, Text = c.DisplayName })
        .ToList();
    var returnUrl = string.IsNullOrEmpty(Context.Request.Path) ? "~/" : $"~{Context.Request.Path.Value}";
}

<div title="@Localizer["Request culture provider:"] @requestCulture?.Provider?.GetType().Name">
    <form id="selectLanguage" asp-controller="Language"
          asp-action="SetLanguage" asp-route-returnUrl="@returnUrl"
          method="post" class="form-horizontal" role="form">
        <label asp-for="@requestCulture.RequestCulture.UICulture.Name">@Localizer["Language:"]</label>
        <select name="culture" onchange="this.form.submit();"
                asp-for="@requestCulture.RequestCulture.UICulture.Name"
                asp-items="cultureItems"></select>
    </form>
</div>

我通过以下方式将其加载到页脚中：

@await  Html.PartialAsync("_SelectLanguagePartial")

这很好用，但问题是我只得到italian语言，但我应该在Configure我指定这些语言的方法中得到英语，事实上：

var supportedCultures = new[]
{
    new CultureInfo("it-IT"),
    new CultureInfo("en-EN")
};

app.UseRequestLocalization(new RequestLocalizationOptions
{
    DefaultRequestCulture = new RequestCulture("it-IT"),
    SupportedCultures = supportedCultures,
    SupportedUICultures = supportedCultures
});

正如你所看到的，我设置为默认语言，italian但我也有english语言，我也尝试编辑，en-US但在选择中我只得到italian语言。

我做错了什么？

Answer 1

对@inject IOptions<RequestLocalizationOptions> LocOptions，它retrives文化的RequestLocalizationOptions，你需要配置RequestLocalizationOptions在ConfigureServices象下面这样：

        public void ConfigureServices(IServiceCollection services)
    {
        services.AddLocalization(options => options.ResourcesPath = "Resources");
        services.Configure<CookiePolicyOptions>(options =>
        {
            //rest code

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

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

            // 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;
        });
    }

您可以通过配置RequestLocalizationOptions然后在Configure下面使用它以避免重复代码。

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