/// <summary>
    /// 数据缓存类
    /// </summary>
    public class DataCache
    {

        #region 缓存依赖文件web.config
        private static string _webconfigfile = string.Empty;
        /// <summary>
        /// 缓存依赖文件web.config
        /// </summary>
        public static string webconfigfile
        {
            get
            {
                if (_webconfigfile == string.Empty) _webconfigfile = HttpContext.Current.Server.MapPath("/web.config");
                return _webconfigfile;
            }
        } 
        #endregion

        #region 删除缓存
        /// <summary>
        /// 删除缓存
        /// </summary>
        /// <param name="CacheKey">键</param>
        public static void DeleteCache(string CacheKey)
        {
            HttpRuntime.Cache.Remove(CacheKey);
        } 
        #endregion

        #region 获取缓存
        /// <summary>
        /// 获取缓存
        /// </summary>
        /// <param name="CacheKey">键</param>
        /// <returns></returns>
        public static object GetCache(string CacheKey)
        {
            return HttpRuntime.Cache[CacheKey];
        } 
        #endregion

        #region 简单的插入缓存
        /// <summary>
        /// 简单的插入缓存
        /// </summary>
        /// <param name="CacheKey">键</param>
        /// <param name="objObject">数据</param>
        public static void SetCache(string CacheKey, object objObject)
        {
            HttpRuntime.Cache.Insert(CacheKey, objObject);
        } 
        #endregion

        #region 有过期时间的插入缓存数据
        /// <summary>
        /// 有过期时间的插入缓存数据
        /// </summary>
        /// <param name="CacheKey">键</param>
        /// <param name="objObject">数据</param>
        /// <param name="absoluteExpiration">过期时间</param>
        /// <param name="slidingExpiration">可调度参数，传null就是禁用可调度</param>
        public static void SetCache(string CacheKey, object objObject, DateTime absoluteExpiration, TimeSpan slidingExpiration)
        {
            if (slidingExpiration == null) slidingExpiration = Cache.NoSlidingExpiration;
            HttpRuntime.Cache.Insert(CacheKey, objObject, null, absoluteExpiration, slidingExpiration);
        } 
        #endregion

        #region 插入缓存数据，指定缓存多少秒
        /// <summary>
        /// 插入缓存数据，指定缓存多少秒
        /// </summary>
        /// <param name="CacheKey">缓存的键</param>
        /// <param name="objObject">缓存的数据</param>
        /// <param name="seconds">缓存秒数</param>
        /// <param name="slidingExpiration">传null就是禁用可调度过期</param>
        public static void SetCacheSecond(string CacheKey, object objObject, int seconds, TimeSpan slidingExpiration)
        {
            DateTime absoluteExpiration = DateTime.Now.AddSeconds(seconds);
            if (slidingExpiration == null) slidingExpiration = Cache.NoSlidingExpiration;
            HttpRuntime.Cache.Insert(CacheKey, objObject, null, absoluteExpiration, slidingExpiration);
        } 
        #endregion

        #region 依赖文件的缓存，文件没改不会过期
        /// <summary>
        /// 依赖文件的缓存，文件没改不会过期
        /// </summary>
        /// <param name="CacheKey">键</param>
        /// <param name="objObject">数据</param>
        /// <param name="depfilename">依赖文件，可调用 DataCache 里的变量</param>
        public static void SetCacheDepFile(string CacheKey, object objObject, string depfilename)
        {
            //缓存依赖对象
            System.Web.Caching.CacheDependency dep = new System.Web.Caching.CacheDependency(depfilename);
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;