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
 1 /// <summary>
 2     /// Auto versioning of custom static files.
 3     /// </summary>
 4     public static class HtmlHelperExtension
 5     {
 6         public static MvcHtmlString IncludeVersionedJs(this HtmlHelper helper, string filename)
 7         {
 8             string version = GetVersion(helper, filename);
 9             return MvcHtmlString.Create("<script type='text/javascript' src='" + filename + version + "'></script>");
10         }
11 
12         public static MvcHtmlString IncludeVersionedCss(this HtmlHelper helper, string filename)
13         {
14             string version = GetVersion(helper, filename);
15             return MvcHtmlString.Create("<link rel='stylesheet' href='" + filename + version + "'/>");
16         }
17 
18         static string GetVersion(this HtmlHelper helper, string filename)
19         {
20             var context = helper.ViewContext.RequestContext.HttpContext;
21 
22             if (context.Cache[filename] == null)
23             {
24                 var physicalPath = context.Server.MapPath(filename);
25                 var version = "?v=" + new System.IO.FileInfo(physicalPath).LastWriteTime.ToString("yyyyMMddHHmmss");
26                 context.Cache.Add(physicalPath, version, null, DateTime.UtcNow.AddSeconds(60), System.Web.Caching.Cache.NoSlidingExpiration, CacheItemPriority.Default, null);
27                 context.Cache[filename] = version;
28                 return version;
29             }
30             else
31             {
32                 return context.Cache[filename] as string;
33             }
34         }
35 
36         public static string GetFileWithVersion(this HtmlHelper helper, string filename)
37         {
38             return filename + GetVersion(helper, filename);
39         }
40     }