实现asp.net mvc页面二级缓存，提高访问性能

实现的mvc二级缓存的类

  //Asp.Net MVC视图页面二级缓存
    public class TwoLevelViewCache : IViewLocationCache
    {
        private readonly static object SKey = new object();
        private readonly IViewLocationCache _cache;

        public TwoLevelViewCache(IViewLocationCache cache)
        {
            _cache = cache;
        }

        private static IDictionary<string, string> GetRequestCache(HttpContextBase httpContext)
        {
            var d = httpContext.Items[SKey] as IDictionary<string, string>;
            if (d == null)
            {
                d = new Dictionary<string, string>();
                httpContext.Items[SKey] = d;
            }
            return d;
        }

        public string GetViewLocation(HttpContextBase httpContext, string key)
        {
            var d = GetRequestCache(httpContext);
            string location;
            if (!d.TryGetValue(key, out location))
            {
                location = _cache.GetViewLocation(httpContext, key);
                d[key] = location;
            }
            return location;
        }

        public void InsertViewLocation(HttpContextBase httpContext, string key, string virtualPath)
        {
            _cache.InsertViewLocation(httpContext, key, virtualPath);
        }

    }

在Global.asax.cs类中Application_Start()方法调用缓存方法，实现二级页面缓存

 public class MvcApplication : System.Web.HttpApplication
    {
        protected void Application_Start()
        {
            ////其余省略
            ViewEngines.Engines.Clear();//清除aspx和razor模式，阻断查找两种页面模式所消耗的时间
            var ve = new RazorViewEngine();
            ve.ViewLocationCache = new TwoLevelViewCache(ve.ViewLocationCache);//创建二级页面缓存，提高性能
            ViewEngines.Engines.Add(ve);

        }
    }