ASP.NET MVC 3 Razor 多国语言参考解决方案 补充三

转自 http://www.cnblogs.com/think8848/archive/2011/03/20/1989376.html

 

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;
    }
}