ASP.NET Core 请求本地化选项答案

【问题标题】：ASP.NET Core Request Localization OptionsASP.NET Core 请求本地化选项
【发布时间】：2016-12-24 16:55:27
【问题描述】：

这是我的自定义请求文化提供程序，如果 url 中没有指定文化（例如 http://sypalo.com/ru 或 http://sypalo.com/en），它将返回“en”作为默认文化。我的想法是以用户浏览器中默认的语言显示网站，所以我正在寻找一种方法来确定它并返回它而不是：return Task.FromResult(new ProviderCultureResult("en", "en"));

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

    options.DefaultRequestCulture = new RequestCulture(culture: "en", uiCulture: "en");
    options.SupportedCultures = supportedCultures;
    options.SupportedUICultures = supportedCultures;

    options.RequestCultureProviders.Insert(0, new CustomRequestCultureProvider(context =>
    {                    
        var pathSegments = context.Request.Path.Value.Split('/');
        if (pathSegments.Count() > 0)
        if (supportedCultures.Select(x => x.TwoLetterISOLanguageName).Contains((pathSegments[1])))
            return Task.FromResult(new ProviderCultureResult(pathSegments[1], pathSegments[1]));
       return Task.FromResult(new ProviderCultureResult("en", "en"));
   }));
});

【问题讨论】：

标签： c# asp.net asp.net-mvc asp.net-core

【解决方案1】：

您可以从当前的Request 获取Accept-Language 标头并设置默认语言。你的代码应该是这样的：

services.Configure<RequestLocalizationOptions>(options =>
{
    //...

    options.RequestCultureProviders.Insert(0, new CustomRequestCultureProvider(context =>
    {                    
       //...
       var userLangs = context.Request.Headers["Accept-Language"].ToString();
       var firstLang = userLangs.Split(',').FirstOrDefault();
       var defaultLang = string.IsNullOrEmpty(firstLang) ? "en" : firstLang;
       return Task.FromResult(new ProviderCultureResult(defaultLang, defaultLang));
   }));
});

【讨论】：

非常感谢 Adem，这正是我想要的！

【解决方案2】：

另一种通过框架调用（ASP.NET Core）获取 Accept-Language 标头的方法：

HttpContext.Request.GetTypedHeaders().AcceptLanguage

【讨论】：

不要忘记按优先级排序语言q，例如OrderByDescending(x => x.Quality ?? 1).

【解决方案3】：

在你的public class Startup：

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    //...

    app.Use((context, next) =>
    {
        //get client prefered language
        var userLangs = context.Request.Headers["Accept-Language"].ToString();
        var firstLang = userLangs.Split(',').FirstOrDefault();

        //set allowed alanguage
        var lang = "en"; //default
        switch (firstLang)
        {
            case "hy": //allowed
            case "ru": //allowed
                lang = firstLang; 
                break;
            default:
                //client language not supported
                lang = "en"; //use our default
                break;
        }

        //switch culture
        Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo(lang);
        Thread.CurrentThread.CurrentUICulture = Thread.CurrentThread.CurrentCulture;

        //save for later use
        context.Items["ClientLang"] = lang;
        context.Items["ClientCulture"] = Thread.CurrentThread.CurrentUICulture.Name;
        
        // Call the next delegate/middleware in the pipeline
        return next();
    });

    //... then goes app.UseMvc etc..

}

【讨论】：

【解决方案4】：

作为附加选项，这是一个完整的解决方案：Handle culture in route (URL) via RequestCultureProviders

作为一个选项，这里是 CustomRequestCultureProvider 的简化代码：

options.RequestCultureProviders.Insert(0, new CustomRequestCultureProvider(context =>
{
    var lang = context.Request.GetTypedHeaders().AcceptLanguage.FirstOrDefault()?.Value.Value ?? Constants.Languages.EN_US;

    return Task.FromResult(new ProviderCultureResult(lang, lang));

}));

【讨论】：