ASP.NET MVC——OutputCache

示例程序

1.在Action上标记启用缓存,如：[OutputCache(Duration = 5, VaryByParam = 'none')]

2.在Action上标记禁用本地缓存,如：[OutputCache(Location = System.Web.UI.OutputCacheLocation.None)]

3.在Action上标记使用缓存依赖,如：[OutputCache(Duration = 9999, VaryByParam = 'none', SqlDependency ='Demo:UserInfo')]

使用缓存依赖的要点

1.在Web.config中添加数据库连接字符串，如下：

<connectionStrings>

..<add name="DemoConn" connectionString="server=.\SQLEXPRESS;database=Demo;uid=sa;pwd=123456" providerName="System.Data.SqlClient"/>

</connectionStrings>

2.在Web.config中添加缓存配置，如下：

<caching>

..<sqlCacheDependency enabled="true" pollTime="2000">

....<databases>

......<add name="Demo" connectionStringName="DemoConn" />

....</databases>

..</sqlCacheDependency>

</caching>

3.在Global.asax.cs中以编程的方式启用缓存依赖，如下：

protected void Application_Start()

{

..string connStr = System.Configuration.ConfigurationManager.ConnectionStrings["DemoConn"].ConnectionString;

..System.Web.Caching.SqlCacheDependencyAdmin.EnableNotifications(connStr);

..System.Web.Caching.SqlCacheDependencyAdmin.EnableTableForNotifications(connStr, "UserInfo");

}

4.使用命令行注册依赖，如下：

aspnet_regsql -S .\sqlexpress -E -d DBName -ed

aspnet_regsql -S .\sqlexpress -E -d DBName -t TableName -et

示例如下：

[HandleError]

    public class CacheHandlerController : Controller

    {

        public ActionResult Index()

        {

            return View();

        }



        [OutputCache(Location = System.Web.UI.OutputCacheLocation.None)]

        public ActionResult RenderWithOutCache()

        {

            ViewData["Now"] = DateTime.Now;

            return View("RenderCache");

        }



       [OutputCache(Duration = 5, VaryByParam = "none")]

        public ActionResult RenderCache()

        {

            ViewData["Now"] = DateTime.Now;

            return View();

        }



        [OutputCache(Duration = 9999, VaryByParam = "none", SqlDependency = "Demo:UserInfo")]

        public ActionResult SqlCacheDependency()

        {

            ViewData["Now"] = DateTime.Now;

            return View("RenderCache");

        }

    }

自定义过滤器 
1.ASP.Net MVC内置四类过滤器分别为： IAuthorizationFilter IActionFilter IResultFilter IExceptionFilter 
2.关于过滤器的说明上述过滤器在使用上存在优先级，且依序从高到低可通过实现对应的接口创建自定义的过滤器 
3.自定义过滤器，示例(...)
 示例如下 
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, Inherited = true, AllowMultiple = true)]

    public class TraceAttribute : FilterAttribute, IActionFilter, IResultFilter

    {

        #region Properties

        public string LogName { get; set; }

        #endregion


        #region IActionFilter Members


        public void OnActionExecuting(ActionExecutingContext filterContext)

        {

            LogMessage(

                filterContext.RouteData.Values["controller"].ToString(),

                filterContext.RouteData.Values["action"].ToString(),

                "Action executing..."

            );

        }



        public void OnActionExecuted(ActionExecutedContext filterContext)

        {

            LogMessage(

                filterContext.RouteData.Values["controller"].ToString(),

                filterContext.RouteData.Values["action"].ToString(),

                "Action executed."

            );

        }

        #endregion


        #region IResultFilter Members


        public void OnResultExecuting(ResultExecutingContext filterContext)

        {

            LogMessage(

                filterContext.RouteData.Values["controller"].ToString(),

                filterContext.RouteData.Values["action"].ToString(),

                "Result executing..."

            );

        }



        public void OnResultExecuted(ResultExecutedContext filterContext)

        {

            LogMessage(

                filterContext.RouteData.Values["controller"].ToString(),

                filterContext.RouteData.Values["action"].ToString(),

                "Result executed."

            );

        }


        #endregion


        #region Helper methods


        private void LogMessage(string controller, string action, string message)

        {

            ......

        }


        #endregion

    }