（转载）ASP.NET MVC多语言切换

流程图

1.创建语言文件

创建App_GlobalResources文件夹

创建Language文件夹

创建资源文件

这些操作做完后，目录结构应该是以下这样的

我们打开每个资源文件，在里面添加一条TiTle数据

我推荐使用ResX Manager来管理语言文件

比如我已经创建了中文、英语、日语这三个语言文件，我如果要做修改的话就需要每个文件轮流修改，使用ResX Manager就能直接同时修改这三个语言文件，它还提供语言翻译功能。具体使用方法与此文无关，就不再赘述了。

2.创建一个过滤器

namespace MvcEdu.Filters{public class LocalizationAttribute : ActionFilterAttribute{public override void OnActionExecuting(ActionExecutingContext filterContext){bool isSkipLocalization = filterContext.ActionDescriptor.IsDefined(typeof(WithoutLocalizationAttribute), inherit: true) || filterContext.ActionDescriptor.ControllerDescriptor.IsDefined(typeof(WithoutLocalizationAttribute), inherit: true);if (!isSkipLocalization){if (filterContext.RouteData.Values["lang"] != null && !string.IsNullOrWhiteSpace(filterContext.RouteData.Values["lang"].ToString())){///从路由数据(url)里设置语言var lang = filterContext.RouteData.Values["lang"].ToString();Thread.CurrentThread.CurrentUICulture = CultureInfo.CreateSpecificCulture(lang);}else{///从cookie里读取语言设置var cookie = filterContext.HttpContext.Request.Cookies["Localization.CurrentUICulture"];var langHeader = string.Empty;if (cookie != null && cookie.Value != ""){///根据cookie设置语言langHeader = cookie.Value;Thread.CurrentThread.CurrentUICulture = CultureInfo.CreateSpecificCulture(langHeader);}else{///如果读取cookie失败则设置默认语言langHeader = filterContext.HttpContext.Request.UserLanguages[0];Thread.CurrentThread.CurrentUICulture = CultureInfo.CreateSpecificCulture(langHeader);}///把语言值设置到路由值里filterContext.RouteData.Values["lang"] = langHeader;//如果url中不包含语言设置则重定向到包含语言值设置的url里string ReturnUrl = $"/{filterContext.RouteData.Values["lang"]}/{filterContext.RouteData.Values["controller"]}/{filterContext.RouteData.Values["action"]}";filterContext.Result = new RedirectResult(ReturnUrl);}/// 把设置保存进cookieHttpCookie _cookie = new HttpCookie("Localization.CurrentUICulture", Thread.CurrentThread.CurrentUICulture.Name);_cookie.Expires = DateTime.Now.AddYears(1);filterContext.HttpContext.Response.SetCookie(_cookie);base.OnActionExecuting(filterContext);}}}public class WithoutLocalizationAttribute : Attribute{}}

3.配置路由文件

我这边因为只有三个语言文件，所以我对于语言项的输入做了限制。

namespace MvcEdu{public class RouteConfig{public static void RegisterRoutes(RouteCollection routes){routes.IgnoreRoute("{resource}.axd/{*pathInfo}");routes.MapRoute(name: "Localization", // 路由名称url: "{lang}/{controller}/{action}/{id}", // 带有参数的 URL\constraints: new { lang = "zh-CN|en-US|ja-JP" }, //限制可输入的语言项defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }//参数默认值);routes.MapRoute(name: "Default",url: "{controller}/{action}/{id}",defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional });}}}

4.修改HomeController.cs文件，添加修改语言函数

namespace MvcEdu.Controllers{[Localization] //HomeController里的函数都要走Localization过滤器public class HomeController : Controller{public ActionResult Index(){ViewBag.Title = Resources.Language.Title;//页面中的Title值取语言文件里的Title值return View();}public ActionResult About(){ViewBag.Title = Resources.Language.Title;//页面中的Title值取语言文件里的Title值ViewBag.Message = "Your application description page.";return View();}public ActionResult Contact(){ViewBag.Title = Resources.Language.Title;//页面中的Title值取语言文件里的Title值ViewBag.Message = "Your contact page.";return View();}[WithoutLocalization]//这个函数不走Localization过滤器public ActionResult ChangeLanguage(String NewLang, String ReturnUrl){if (!ReturnUrl.EndsWith("/")){ReturnUrl += "/";}//use NewLang replace old lang,include input judgmentif (!string.IsNullOrEmpty(ReturnUrl) && ReturnUrl.Length > 3 && ReturnUrl.StartsWith("/") && ReturnUrl.IndexOf("/", 1) > 0 && new string[] { "zh-CN", "en-US","ja-JP" }.Contains(ReturnUrl.Substring(1, ReturnUrl.IndexOf("/", 1) - 1))){ReturnUrl = $"/{NewLang}{ReturnUrl.Substring(ReturnUrl.IndexOf("/", 1))}";}else{ReturnUrl = $"/{NewLang}{ReturnUrl}";}return Redirect(ReturnUrl);//redirect to new url}}}

注意：我在使用vs express for web时，出现了使用Resources.Language时智能提示没出现Title的情况，此时去找一下Language.designer.cs里有无以下代码，如果没有的话则以后添加键值对的时候你们都要在此手动添加，或者把Language文件夹建在Controllers的同级目录下然后再新建资源文件等操作也能解决该问题。

/// <summary>/// 查找类似标题的本地化字符串。/// </summary>internal static string Title {get {return ResourceManager.GetString("Title", resourceCulture);}}

5.修改母版页，添加了修改语言的link

<div class="navbar-collapse collapse"><ul class="nav navbar-nav"><li>@Html.ActionLink("主页", "Index", "Home")</li><li>@Html.ActionLink("关于", "About", "Home")</li><li>@Html.ActionLink("联系方式", "Contact", "Home")</li>@*以下是添加的内容*@<li>@Html.ActionLink("en-US", "ChangeLanguage", "Home",new { NewLang = "en-US",ReturnUrl=Request.RawUrl},new { @class="testclass"})</li><li>@Html.ActionLink("zh-CN", "ChangeLanguage", "Home", new { NewLang = "zh-CN", ReturnUrl = Request.RawUrl }, new { @class = "testclass" })</li><li>@Html.ActionLink("ja-JP", "ChangeLanguage", "Home", new { NewLang = "ja-JP", ReturnUrl = Request.RawUrl }, new { @class = "testclass" })</li></ul></div>

6.Views/Home的三个页面我都加了显示ViewBag.Title值的代码

<h2>@ViewBag.Title.</h2>

7.现在我们来运行，看一下效果

首次登录的时候因为url是localhost:50062/，没有语言项，所以读取浏览器默认语言“zh-CN”,然后重定向。

以下是点击导航栏的en-US和ja-JP时的情况

8.如果用户直接输入http://localhost:50062/Home/Index/

程序会重定向到http://localhost:50062/cookie里保存的语言项OR浏览器默认语言/Home/Index/

基本做到了和MSDN效果一样。

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作者：Cooldiok

来源：CSDN

原文：/cooldiok/article/details/78313513