[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;
        }
    }