using System;using System.Collections.Generic;using System.Web;using System.Collections;using System.Web.Caching;namespace DMSite.Common{    /// <summary>    /// 服务器缓存帮助类    /// </summary>    public class CacheHelper    {        /// <summary>        /// 创建缓存项的文件依赖        /// </summary>        /// <param name="key">缓存Key</param>        /// <param name="obj">object对象</param>        /// <param name="fileName">文件绝对路径</param>        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            HttpRuntime.Cache.Insert(key, obj, dep);        }        /// <summary>        /// 创建缓存项过期        /// </summary>        /// <param name="key">缓存Key</param>        /// <param name="obj">object对象</param>        public static void Insert(string key, object obj)        {            if (obj != null)            {                if (IsExist(key))                {                    HttpRuntime.Cache[key] = obj;                }                else                {                    int expires = ConvertHelper.ToInt(ConfigHelper.GetAppSettings("TimeCache"));                    HttpRuntime.Cache.Insert(key, obj, null, System.Web.Caching.Cache.NoAbsoluteExpiration, new TimeSpan(0, expires, 0));                }                            }        }        /// <summary>        /// 判断缓存对象是否存在        /// </summary>        /// <param name="strKey">缓存键值名称</param>        /// <returns>是否存在true 、false</returns>        public static bool IsExist(string strKey)        {            return HttpRuntime.Cache[strKey] != null;        }        /// <summary>        /// 获取缓存对象        /// </summary>        /// <param name="key">缓存Key</param>        /// <returns>object对象</returns>        public static object GetCache(string key)        {            if (string.IsNullOrEmpty(key))                return null;            if (ConfigHelper.GetAppSettings("IsCache") == "false")            {                return null;            }            return HttpRuntime.Cache.Get(key);        }        /// <summary>        /// 获取缓存对象        /// </summary>        /// <typeparam name="T">T对象</typeparam>        /// <param name="key">缓存Key</param>        /// <returns></returns>        public static T Get<T>(string key)        {            object obj = GetCache(key);            return obj == null ? default(T) : (T)obj;        }        /// <summary>        /// 移除指定数据缓存        /// </summary>        public static void RemoveCache(string CacheKey)        {            System.Web.Caching.Cache _cache = HttpRuntime.Cache;            _cache.Remove(CacheKey);        }        /// <summary>        /// 移除全部缓存        /// </summary>        public static void RemoveAllCache()        {            System.Web.Caching.Cache _cache = HttpRuntime.Cache;            IDictionaryEnumerator CacheEnum = _cache.GetEnumerator();            while (CacheEnum.MoveNext())            {                _cache.Remove(CacheEnum.Key.ToString());            }        }    }}