静态文件自动加版本号

你还在为浏览器缓存而困扰么，快来看吧

/// <summary>
    /// Auto versioning of custom static files.
    /// </summary>
    public static class HtmlHelperExtension
    {
        public static MvcHtmlString IncludeVersionedJs(this HtmlHelper helper, string filename)
        {
            string version = GetVersion(helper, filename);
            return MvcHtmlString.Create("<script type='text/javascript' src='" + filename + version + "'></script>");
        }

        public static MvcHtmlString IncludeVersionedCss(this HtmlHelper helper, string filename)
        {
            string version = GetVersion(helper, filename);
            return MvcHtmlString.Create("<link rel='stylesheet' href='" + filename + version + "'/>");
        }

        static string GetVersion(this HtmlHelper helper, string filename)
        {
            var context = helper.ViewContext.RequestContext.HttpContext;

            if (context.Cache[filename] == null)
            {
                var physicalPath = context.Server.MapPath(filename);
                var version = "?v=" + new System.IO.FileInfo(physicalPath).LastWriteTime.ToString("yyyyMMddHHmmss");
                context.Cache.Add(physicalPath, version, null, DateTime.UtcNow.AddSeconds(60), System.Web.Caching.Cache.NoSlidingExpiration, CacheItemPriority.Default, null);
                context.Cache[filename] = version;
                return version;
            }
            else
            {
                return context.Cache[filename] as string;
            }
        }

        public static string GetFileWithVersion(this HtmlHelper helper, string filename)
        {
            return filename + GetVersion(helper, filename);
        }
    }