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一、首先建立服务器缓存类

/// 
    /// 服务器缓存帮助类    /// 
    public class CacheHelper    {
           /// 
        /// 缓存数据        /// 
        /// 文件名（需要绝对路径）        /// 数据        /// 
           public static bool CacheDatas(string filename, object datas)        {
               IFormatter fm = new BinaryFormatter();            try            {
                   Stream fStream = new FileStream(filename, FileMode.Create, FileAccess.Write, FileShare.Write);                fm.Serialize(fStream, datas);                fStream.Flush();                fStream.Close();                return true;            }            catch (Exception ex)            {
                   return false;            }        }    /// 
    /// 读取缓存数据    /// 
    /// 文件名    /// 
   
    缓存数据
       public static object ReadDatas(string filename)    {
           IFormatter fm = new BinaryFormatter();        if (File.Exists(filename))        {
               //暂不进行时间过期判断            //if (DateTime.Now > File.GetCreationTime(filePath).AddMinutes(expires))            //{
               //    return null;            //}            try            {
                   Stream stream = new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.Read);                object datas = fm.Deserialize(stream);//反序列化                return datas;            }            catch            {
                   return null;            }        }        else        {
               return null;        }    }                /// 
        /// 创建缓存项的文件依赖        /// 
        /// 缓存Key        /// object对象        /// 文件绝对路径        public static void InsertFile(string key, object obj, string fileName)        {
               //创建缓存依赖项            CacheDependency dep = new CacheDependency(fileName);            //创建缓存            HttpContext.Current.Cache.Insert(key, obj, dep);        }        /// 
        /// 创建缓存项过期        /// 
        /// 缓存Key        /// object对象        public static void Insert(string key, object obj)        {
               if (obj != null)            {
                   int expires = CommonHelper.GetInt(ConfigHelper.GetValue("TimeCache"));                Insert(key, obj, expires);            }        }        /// 
        /// 创建缓存项过期        /// 
        /// 缓存Key        /// object对象        /// 设置时间        public static void Insert(string key, object obj, int expires)        {
               if (obj != null)            {
                   HttpContext.Current.Cache.Insert(key, obj, null, Cache.NoAbsoluteExpiration, new TimeSpan(0, expires, 0));            }        }        /// 
        /// 判断缓存对象是否存在        /// 
        /// 缓存键值名称        /// 
   
    是否存在true 、false
           public static bool IsExist(string strKey)        {
               return HttpContext.Current.Cache[strKey] != null;        }        /// 
        /// 获取缓存对象        /// 
        /// 缓存Key        /// 
   
    object对象
           public static object GetCache(string key)        {
               if (string.IsNullOrEmpty(key))                return null;            if (ConfigHelper.GetValue("IsCache") == "false")            {
                   return null;            }            return HttpContext.Current.Cache.Get(key);        }        /// 
        /// 获取缓存对象        /// 
        /// 
   
    T对象
           /// 缓存Key        /// 
           public static T Get
   
    (string key)        {
               object obj = GetCache(key);            return obj == null ? default(T) : (T)obj;        }        /// 
    
        /// 移除指定数据缓存        /// 
        public static void RemoveAllCache(string CacheKey)        {
               System.Web.Caching.Cache _cache = HttpRuntime.Cache;            _cache.Remove(CacheKey);        }        /// 
    
        /// 移除全部缓存        /// 
        public static void RemoveAllCache()        {
               System.Web.Caching.Cache _cache = HttpRuntime.Cache;            IDictionaryEnumerator CacheEnum = _cache.GetEnumerator();            while (CacheEnum.MoveNext())            {
                   _cache.Remove(CacheEnum.Key.ToString());            }        }    }
   

二、调用的例子

//上述函数的调用示例1：從數據庫表中取出的記錄存入緩存中        string fileName = HttpUtility.UrlEncode(Request.Url.ToString()) + ".cache"; //文件名 ， .cache为自定义文件类型        if (CacheHelper.ReadDatas(fileName) == null)//如果没有该文件（从数据库表查询的记录）的缓存，就写入缓存        {
               SqlDataAdapter ad = new SqlDataAdapter("select * from employee_basic", "server=.;database=SZMMY_ERP;uid=sa;pwd=sa;");            DataSet ds = new DataSet();           ad.Fill(ds);            dt = ds.Tables[0];           this.CacheDatas(fileName, dt);//写入缓存        }       else       {
               dt = (DataTable)cache.ReadDatas(fileName); //读取缓存数据，并转为datatable       }		//調用示例2:將list存入緩存，例如用戶的按鈕權限list		/// 
        /// 将【操作按钮权限】保存在服务器缓存中，提高性能。这样就不用每次去数据库读        /// 
        /// 用户主键        ///         /// 
           public void SetButtonPermission(string UserId, IList list)        {
               CacheHelper.Insert( UserId, list);         }

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