asp.net core mvc后台切换多国语言失败

Question

1.NET 7.0 MVC CORE
2.前台用以下方式可切换语言:
http://localhost:5230/Home/Privacy/?culture=zh-CN //前端变为中文
http://localhost:5230/Home/Privacy/?culture=en-US //前端变为英文?
3.后台用SetCulture去切换语言后，获取失败，调用方式:
3.1 切换语言环境:http://localhost:5230/Home/SetCulture?lang=en
3.2 用以下路径访问均失败：
http://localhost:5230/Home/Get
http://localhost:5230/Home/Get/?culture=zh-CN
http://localhost:5230/Home/Get/?culture=en-US

//启动时配置
public class Program
{
    public static void Main(string[] args)
    {
        var builder = WebApplication.CreateBuilder(args);
        builder.Services.Configure<RequestLocalizationOptions>(options =>
        {
            options.AddSupportedCultures(new string[] { "en-US", "zh-CN", "fr-FR" })
            .AddSupportedUICultures(new string[] { "en-US", "zh-CN", "fr-FR" });
           

            //var supportedCultures = new[]
            //{
            //    new CultureInfo("en-US"),
            //    new CultureInfo("zh-CN"),
            //    new CultureInfo("fr-FR")
            //};
            options.DefaultRequestCulture = new RequestCulture("en-US");
            //options.SupportedCultures = supportedCultures;
            //options.SupportedUICultures = supportedCultures;
        });
        // Add services to the container.
        builder.Services.AddControllersWithViews();
        //builder.Services.AddLocalization(options =>
        //{
        //    options.ResourcesPath = "SharedResource";//指定资源文件目录
        //});
        builder.Services.AddMvc();
 
        builder.Services.AddLocalization();

        var app = builder.Build();

        // Configure the HTTP request pipeline.
        if (!app.Environment.IsDevelopment())
        {
            app.UseExceptionHandler("/Home/Error");
        }

        // 使用请求本地化中间件
        app.UseRequestLocalization();

        app.UseStaticFiles();

        app.UseRouting();

        app.UseAuthorization();

    

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

        app.Run();
    }
}


//后端注入
 public class HomeController : Controller
 {
     private readonly ILogger<HomeController> _logger;
     private readonly IStringLocalizer<SharedResource> _localizer;

     public HomeController(ILogger<HomeController> logger, IStringLocalizer<SharedResource> localizer)
     {
         _logger = logger;
         this._localizer = localizer;
     }

     public IActionResult Index()
     {
         return View();
     }


     [HttpGet]
     public ActionResult SetCulture(string lang)
     { //用于语言切换      
       
         switch (lang.Trim())
         {
             case "en":
                 CultureInfo.CurrentCulture = new CultureInfo("en-US");
                 CultureInfo.CurrentUICulture = new CultureInfo("en-US");
                 break;
             case "cn":
                 CultureInfo.CurrentCulture = new CultureInfo("zh-CN");
                 CultureInfo.CurrentUICulture = new CultureInfo("zh-CN");
                 break;
             case "tw":
                 CultureInfo.CurrentCulture = new CultureInfo("zh-TW");
                 CultureInfo.CurrentUICulture = new CultureInfo("zh-TW");
                 break;
         };
       
         Response.Cookies.Append("culture", lang, new CookieOptions
         {
             Expires = DateTime.Now.AddYears(1)
         });         
         return Json(new { success = true });
     }

     public IActionResult Privacy()
     {
         var lg = HttpContext.Request.Cookies["culture"];
         Console.WriteLine(_localizer.GetString("Name").Value);
         Console.WriteLine(CultureInfo.CurrentCulture.Name);
         return View();
     }

//伪类，用来代理共享资源，两个资源文件分别为：

SharedResource.en-US、SharedResource.zh-CN
 public class SharedResource
 {}

//从后台获取多语言值，失败

     /// <summary>
     /// 获取多语言
     /// </summary>
     /// <returns></returns>
     [HttpGet]
     public string Get()
     {
         return _localizer.GetString("Name").Value + "\n";
     }

//从前台获取多语言值，可访问

@using Microsoft.Extensions.Localization
@using WebApplication3.Resource
@{
    ViewData["Title"] = "Privacy Policy";
}
<h1>@ViewData["Title"]</h1>
<p>Use this page to detail your site's privacy policy.</p>
@inject IStringLocalizer<SharedResource> IR;

@{
    var d = IR["name"].Value;
    <h1>@d</h1>
}
     [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
     public IActionResult Error()
     {
         return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
     }
 }

Answer 1

下午好🌅🌅🌅
本答案参考ChatGPT-3.5

问题分析：

1. 后台用SetCulture去切换语言后，获取失败。
2. 需要先设置默认的翻译，然后再使用SetCulture进行语言切换。

解决方案：

1. 在Startup.cs中设置默认的翻译，并将默认的语言作为参数传递给SetCulture方法。
2. 在处理HTTP请求时，使用Request localization options来初始化并应用默认的翻译。

以下是修改后的代码：

// ...
public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddControllersWithViews();
        services.AddSingleton<IStringLocalizer<SharedResource>>((局部变量) => LocalizerFactory.Get localizedizer($"SharedResource.{局部变量}$"));

        services.AddRequestLocalization(options =>
        {
            options.SetDefaultRequestCulture(new RequestCulture("en-US"));
            options.SupportedCultures = new[]
            {
                new CultureInfo("en-US"),
                new CultureInfo("zh-CN"),
                new CultureInfo("fr-FR")
            };
        });

        // ...
    }

    // ...

    [HttpGet]
    public ActionResult SetCulture(string lang)
    { //用于语言切换      
       
         switch (lang.Trim())
         {
             case "en":
                 CultureInfo.CurrentUICulture = new CultureInfo("en-US");
                 CultureInfo.CurrentUICulture = new CultureInfo("en-US");
                 break;
             case "cn":
                 CultureInfo.CurrentUICulture = new CultureInfo("zh-CN");
                 CultureInfo.CurrentUICulture = new CultureInfo("zh-CN");
                 break;
             case "tw":
                 CultureInfo.CurrentUICulture = new CultureInfo("zh-TW");
                 CultureInfo.CurrentUICulture = new CultureInfo("zh-TW");
                 break;
         };

       
         Response.Cookies.Append("culture", lang, new CookieOptions
         {
             Expires = DateTime.Now.AddYears(1)
         });         
         return Json(new { success = true });
     }

     //从前台获取多语言值，可访问 @using Microsoft.Extensions.Localization
@using WebApplication3.Res和平量生成器
public classSharedResource
{
}

注意：这里的示例中没有考虑到当加载不同文化和语言的页面时可能会出现的问题。如果你的应用有这种情况，可能需要对应用程序进行一些改进以更好地适应不同的文化和语言。