我已经翻译了我的 mvc 网站，效果很好。如果我选择另一种语言(荷兰语或英语)，内容就会被翻译。
这是有效的，因为我在 session 中设置了文化。

现在我想在 url 中显示选定的文化(=文化)。
如果它是默认语言，则不应在 url 中显示，只有当它不是默认语言时，才应在 url 中显示。

例如。:

对于默认文化(荷兰语):

site.com/foo
site.com/foo/bar
site.com/foo/bar/5

site.com/en/foo
site.com/en/foo/bar
site.com/en/foo/bar/5

  public class RouteConfig
  {
    public static void RegisterRoutes(RouteCollection routes)
    {
      routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
      routes.IgnoreRoute("favicon.ico");

      routes.LowercaseUrls = true;

      routes.MapRoute(
        name: "Errors",
        url: "Error/{action}/{code}",
        defaults: new { controller = "Error", action = "Other", code = RouteParameter.Optional }
        );

      routes.MapRoute(
        name: "DefaultWithCulture",
        url: "{culture}/{controller}/{action}/{id}",
        defaults: new { culture = "nl", controller = "Home", action = "Index", id = UrlParameter.Optional },
        constraints: new { culture = "[a-z]{2}" }
        );// or maybe: "[a-z]{2}-[a-z]{2}

      routes.MapRoute(
          name: "Default",
          url: "{controller}/{action}/{id}",
          defaults: new { culture = "nl", controller = "Home", action = "Index", id = UrlParameter.Optional }
      );
    }

  protected void Application_Start()
    {
      MvcHandler.DisableMvcResponseHeader = true;

      AreaRegistration.RegisterAllAreas();
      FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
      RouteConfig.RegisterRoutes(RouteTable.Routes);
      BundleConfig.RegisterBundles(BundleTable.Bundles);
    }

    protected void Application_AcquireRequestState(object sender, EventArgs e)
    {
      if (HttpContext.Current.Session != null)
      {
        CultureInfo ci = (CultureInfo)this.Session["Culture"];
        if (ci == null)
        {
          string langName = "nl";
          if (HttpContext.Current.Request.UserLanguages != null && HttpContext.Current.Request.UserLanguages.Length != 0)
          {
            langName = HttpContext.Current.Request.UserLanguages[0].Substring(0, 2);
          }
          ci = new CultureInfo(langName);
          this.Session["Culture"] = ci;
        }

        HttpContextBase currentContext = new HttpContextWrapper(HttpContext.Current);
        RouteData routeData = RouteTable.Routes.GetRouteData(currentContext);
        routeData.Values["culture"] = ci;

        Thread.CurrentThread.CurrentUICulture = ci;
        Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture(ci.Name);
      }
    }

// ...
                            <ul class="dropdown-menu" role="menu">
                                <li class="@isCurrentLang("nl")">@Html.ActionLink("Nederlands", "ChangeCulture", "Culture", new { lang = "nl", returnUrl = this.Request.RawUrl }, new { rel = "alternate", hreflang = "nl" })</li>
                                <li class="@isCurrentLang("en")">@Html.ActionLink("English", "ChangeCulture", "Culture", new { lang = "en", returnUrl = this.Request.RawUrl }, new { rel = "alternate", hreflang = "en" })</li>
                            </ul>
// ...

public class CultureController : Controller
  {
    // GET: Culture
    public ActionResult Index()
    {
      return RedirectToAction("Index", "Home");
    }

    public ActionResult ChangeCulture(string lang, string returnUrl)
    {
      Session["Culture"] = new CultureInfo(lang);
      if (Url.IsLocalUrl(returnUrl))
      {
        return Redirect(returnUrl);
      }
      else
      {
        return RedirectToAction("Index", "Home");
      }
    }
  }

最佳答案

这种方法有几个问题，但归结为工作流程问题。

using System.Globalization;
using System.Threading;
using System.Web.Mvc;

public class CultureFilter : IAuthorizationFilter
{
    private readonly string defaultCulture;

    public CultureFilter(string defaultCulture)
    {
        this.defaultCulture = defaultCulture;
    }

    public void OnAuthorization(AuthorizationContext filterContext)
    {
        var values = filterContext.RouteData.Values;

        string culture = (string)values["culture"] ?? this.defaultCulture;

        CultureInfo ci = new CultureInfo(culture);

        Thread.CurrentThread.CurrentCulture = ci;
        Thread.CurrentThread.CurrentUICulture = CultureInfo.CreateSpecificCulture(ci.Name);
    }
}

public class FilterConfig
{
    public static void RegisterGlobalFilters(GlobalFilterCollection filters)
    {
        filters.Add(new CultureFilter(defaultCulture: "nl"));
        filters.Add(new HandleErrorAttribute());
    }
}

@{ 
    var routeValues = this.ViewContext.RouteData.Values;
    var controller = routeValues["controller"] as string;
    var action = routeValues["action"] as string;
}
<ul>
    <li>@Html.ActionLink("Nederlands", @action, @controller, new { culture = "nl" }, new { rel = "alternate", hreflang = "nl" })</li>
    <li>@Html.ActionLink("English", @action, @controller, new { culture = "en" }, new { rel = "alternate", hreflang = "en" })</li>
</ul>

@ActionLink("About", "About", "Home")

using System.Text.RegularExpressions;
using System.Web;
using System.Web.Routing;

public class CultureConstraint : IRouteConstraint
{
    private readonly string defaultCulture;
    private readonly string pattern;

    public CultureConstraint(string defaultCulture, string pattern)
    {
        this.defaultCulture = defaultCulture;
        this.pattern = pattern;
    }

    public bool Match(
        HttpContextBase httpContext, 
        Route route, 
        string parameterName, 
        RouteValueDictionary values, 
        RouteDirection routeDirection)
    {
        if (routeDirection == RouteDirection.UrlGeneration && 
            this.defaultCulture.Equals(values[parameterName]))
        {
            return false;
        }
        else
        {
            return Regex.IsMatch((string)values[parameterName], "^" + pattern + "$");
        }
    }
}

routes.LowercaseUrls = true;

routes.MapRoute(
  name: "Errors",
  url: "Error/{action}/{code}",
  defaults: new { controller = "Error", action = "Other", code = UrlParameter.Optional }
  );

routes.MapRoute(
  name: "DefaultWithCulture",
  url: "{culture}/{controller}/{action}/{id}",
  defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional },
  constraints: new { culture = new CultureConstraint(defaultCulture: "nl", pattern: "[a-z]{2}") }
  );

routes.MapRoute(
    name: "Default",
    url: "{controller}/{action}/{id}",
    defaults: new { culture = "nl", controller = "Home", action = "Index", id = UrlParameter.Optional }
);

NOTE: This section applies only if you are using MVC 5. You can skip this if you are using a previous version.

using System;
using System.Collections;
using System.Linq;
using System.Reflection;
using System.Web.Mvc;
using System.Web.Mvc.Routing;
using System.Web.Routing;

public static class RouteCollectionExtensions
{
    public static void MapLocalizedMvcAttributeRoutes(this RouteCollection routes, string urlPrefix, object constraints)
    {
        MapLocalizedMvcAttributeRoutes(routes, urlPrefix, new RouteValueDictionary(constraints));
    }

    public static void MapLocalizedMvcAttributeRoutes(this RouteCollection routes, string urlPrefix, RouteValueDictionary constraints)
    {
        var routeCollectionRouteType = Type.GetType("System.Web.Mvc.Routing.RouteCollectionRoute, System.Web.Mvc");
        var subRouteCollectionType = Type.GetType("System.Web.Mvc.Routing.SubRouteCollection, System.Web.Mvc");
        FieldInfo subRoutesInfo = routeCollectionRouteType.GetField("_subRoutes", BindingFlags.NonPublic | BindingFlags.Instance);

        var subRoutes = Activator.CreateInstance(subRouteCollectionType);
        var routeEntries = Activator.CreateInstance(routeCollectionRouteType, subRoutes);

        // Add the route entries collection first to the route collection
        routes.Add((RouteBase)routeEntries);

        var localizedRouteTable = new RouteCollection();

        // Get a copy of the attribute routes
        localizedRouteTable.MapMvcAttributeRoutes();

        foreach (var routeBase in localizedRouteTable)
        {
            if (routeBase.GetType().Equals(routeCollectionRouteType))
            {
                // Get the value of the _subRoutes field
                var tempSubRoutes = subRoutesInfo.GetValue(routeBase);

                // Get the PropertyInfo for the Entries property
                PropertyInfo entriesInfo = subRouteCollectionType.GetProperty("Entries");

                if (entriesInfo.PropertyType.GetInterfaces().Contains(typeof(IEnumerable)))
                {
                    foreach (RouteEntry routeEntry in (IEnumerable)entriesInfo.GetValue(tempSubRoutes))
                    {
                        var route = routeEntry.Route;

                        // Create the localized route
                        var localizedRoute = CreateLocalizedRoute(route, urlPrefix, constraints);

                        // Add the localized route entry
                        var localizedRouteEntry = CreateLocalizedRouteEntry(routeEntry.Name, localizedRoute);
                        AddRouteEntry(subRouteCollectionType, subRoutes, localizedRouteEntry);

                        // Add the default route entry
                        AddRouteEntry(subRouteCollectionType, subRoutes, routeEntry);


                        // Add the localized link generation route
                        var localizedLinkGenerationRoute = CreateLinkGenerationRoute(localizedRoute);
                        routes.Add(localizedLinkGenerationRoute);

                        // Add the default link generation route
                        var linkGenerationRoute = CreateLinkGenerationRoute(route);
                        routes.Add(linkGenerationRoute);
                    }
                }
            }
        }
    }

    private static Route CreateLocalizedRoute(Route route, string urlPrefix, RouteValueDictionary constraints)
    {
        // Add the URL prefix
        var routeUrl = urlPrefix + route.Url;

        // Combine the constraints
        var routeConstraints = new RouteValueDictionary(constraints);
        foreach (var constraint in route.Constraints)
        {
            routeConstraints.Add(constraint.Key, constraint.Value);
        }

        return new Route(routeUrl, route.Defaults, routeConstraints, route.DataTokens, route.RouteHandler);
    }

    private static RouteEntry CreateLocalizedRouteEntry(string name, Route route)
    {
        var localizedRouteEntryName = string.IsNullOrEmpty(name) ? null : name + "_Localized";
        return new RouteEntry(localizedRouteEntryName, route);
    }

    private static void AddRouteEntry(Type subRouteCollectionType, object subRoutes, RouteEntry newEntry)
    {
        var addMethodInfo = subRouteCollectionType.GetMethod("Add");
        addMethodInfo.Invoke(subRoutes, new[] { newEntry });
    }

    private static RouteBase CreateLinkGenerationRoute(Route innerRoute)
    {
        var linkGenerationRouteType = Type.GetType("System.Web.Mvc.Routing.LinkGenerationRoute, System.Web.Mvc");
        return (RouteBase)Activator.CreateInstance(linkGenerationRouteType, innerRoute);
    }
}

public class RouteConfig
{
    public static void RegisterRoutes(RouteCollection routes)
    {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

        // Call to register your localized and default attribute routes
        routes.MapLocalizedMvcAttributeRoutes(
            urlPrefix: "{culture}/", 
            constraints: new { culture = new CultureConstraint(defaultCulture: "nl", pattern: "[a-z]{2}") }
        );

        routes.MapRoute(
            name: "DefaultWithCulture",
            url: "{culture}/{controller}/{action}/{id}",
            defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional },
            constraints: new { culture = new CultureConstraint(defaultCulture: "nl", pattern: "[a-z]{2}") }
        );

        routes.MapRoute(
            name: "Default",
            url: "{controller}/{action}/{id}",
            defaults: new { culture = "nl", controller = "Home", action = "Index", id = UrlParameter.Optional }
        );
    }
}

关于c# - 路由和 url 中的 ASP.NET MVC 5 文化，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/32764989/