protected void Application_BeginRequest()

         {

 　　　　      //获取当前请求的url

             string url = HttpContext.Current.Request.Path;

             //获取请求的文件后缀名

             string extension = Path.GetExtension(url);

             //由于MVC动态页面不带后缀，所有其他有后缀的都加上缓存

             if (string.IsNullOrWhiteSpace(extension)) return;

              HttpResponse Response = HttpContext.Current.Response;

              Response.Cache.SetCacheability(HttpCacheability.Public);

              Response.Cache.SetMaxAge(new TimeSpan(, , ));

              Response.Cache.SetExpires(DateTime.Now.AddYears());

         }