[原]ASP.NET MVC 3 Razor 多国语言参考解决方案 补充三

原以为可以使用之前的多国语言方案进行编程了，没想到第一个正式点的页面就卡了，为什么呢，因为通过HtmlHelper只能找到当前请求的View是哪个，如果这个View使用了Layout或是Partial就歇菜了。通过一番尝试，发现使用HtmlHelper.ViewDataContainer属性可以获得一个WebViewPage对象，这个对象中的VirtualPath对象代表当前正在Excute的页面属于哪个物理文件(.cshtml)，于是修改代码如下:

    public static class LocalizationHelper

    {

        public static string Lang(this HtmlHelper htmlhelper, string key)

        {

            var viewPath = (htmlhelper.ViewDataContainer as WebViewPage).VirtualPath;

            var viewName = viewPath.Substring(viewPath.LastIndexOf('/'), viewPath.Length - viewPath.LastIndexOf('/')).TrimStart('/');

            var filePath = htmlhelper.ViewContext.HttpContext.Server.MapPath(viewPath.Substring(0, viewPath.LastIndexOf('/') + 1)) + "App_LocalResources";

            var langs = htmlhelper.ViewContext.HttpContext.Request.UserLanguages.Union<string>(new string[] { "" });



            IEnumerable<DictionaryEntry> resxs = null;



            foreach (var lang in langs)

            {

                var resxKey =

                    string.IsNullOrWhiteSpace(lang) ? string.Format(@"{0}\{1}.resx", filePath, viewName) : string.Format(@"{0}\{1}.{2}.resx", filePath, viewName, lang);



                resxs = GetResx(resxKey);



                if (resxs != null) { break; }

            }



            return (string)resxs.FirstOrDefault<DictionaryEntry>(x => x.Key.ToString() == key).Value;

        }



        private static IEnumerable<DictionaryEntry> GetResx(string resxKey)

        {

            ObjectCache cache = MemoryCache.Default;



            IEnumerable<DictionaryEntry> resxs = null;



            if (cache.Contains(resxKey))

            {

                resxs = cache.GetCacheItem(resxKey).Value as IEnumerable<DictionaryEntry>;

            }

            else

            {

                if (File.Exists(resxKey))

                {

                    resxs = new ResXResourceReader(resxKey).Cast<DictionaryEntry>();

                    cache.Add(resxKey, resxs, new CacheItemPolicy() { Priority = CacheItemPriority.NotRemovable });

                }

            }



            return resxs;

        }

    }