using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;public partial class Default4 : System.Web.UI.Page{    /// <summary>    /// 获取当前应用程序指定CacheKey的Cache对象值    /// </summary>    /// <param name="CacheKey">索引键值</param>    /// <returns>返回缓存对象</returns>    public static object GetCache(string CacheKey)    {            System.Web.Caching.Cache objCache = HttpRuntime.Cache;            return objCache[CacheKey];    }    /// <summary>    /// 设置以缓存依赖的方式缓存数据    /// </summary>    /// <param name="CacheKey">索引键值</param>    /// <param name="objObject">缓存对象</param>    /// <param name="cacheDepen">依赖对象</param>    public static void SetCache(string CacheKey, object objObject, System.Web.Caching.CacheDependency dep)    {            System.Web.Caching.Cache objCache = HttpRuntime.Cache;            objCache.Insert(                    CacheKey,                    objObject,                    dep,                    System.Web.Caching.Cache.NoAbsoluteExpiration, //从不过期                    System.Web.Caching.Cache.NoSlidingExpiration, //禁用可调过期                    System.Web.Caching.CacheItemPriority.Default,                    null);    }    protected void Page_Load(object sender, EventArgs e)    {        string CacheKey = "cachetest";         object objModel = GetCache(CacheKey);        //从缓存中获取            if (objModel == null) //缓存里没有            {                    objModel = DateTime.Now;//把当前时间进行缓存                    if (objModel != null)                    {                            //依赖 C:\\test.txt 文件的变化来更新缓存                            System.Web.Caching.CacheDependency dep = new System.Web.Caching.CacheDependency("C:\\test.txt");                            SetCache(CacheKey, objModel, dep);//写入缓存                    }            }            Label1.Text = objModel.ToString();    }}