using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Caching;
using System.Web.Hosting;
namespace FangYar.Common
{
    /// <summary>
    /// Caching 的摘要说明
    /// </summary>
    public class CacheHelper
    {

        /// <summary>
        /// 获取当前应用程序指定CacheKey的Cache值
        /// </summary>
        /// <param name="CacheKey">
        /// <returns></returns>y
        public static object GetCache(string CacheKey)
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            return objCache[CacheKey];
        }

        /// <summary>
        /// 设置当前应用程序指定CacheKey的Cache值
        /// </summary>
        /// <param name="CacheKey">
        /// <param name="objObject">
        public static void SetCache(string CacheKey, object objObject)
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            objCache.Insert(CacheKey, objObject);
        }


        /// <summary>
        /// 设置当前应用程序指定CacheKey的Cache值
        /// </summary>
        /// <param name="CacheKey">
        /// <param name="objObject">
        public static void SetCache(string CacheKey, object objObject, DateTime absoluteExpiration, TimeSpan slidingExpiration)
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            objCache.Insert(CacheKey, objObject, null, absoluteExpiration, slidingExpiration);
        }

        /// <summary>  
        /// 设置数据缓存  
        /// </summary> 
        public static void SetCache(string CacheKey, object objObject, int timeout = 7200)
        {
            try
            {
                if (objObject == null) return;
                var objCache = HttpRuntime.Cache;
                //相对过期  
                //objCache.Insert(cacheKey, objObject, null, DateTime.MaxValue, timeout, CacheItemPriority.NotRemovable, null);  
                //绝对过期时间  
                objCache.Insert(CacheKey, objObject, null, DateTime.Now.AddSeconds(timeout), TimeSpan.Zero, CacheItemPriority.High, null);
            }
            catch (Exception)
            {
                //throw;  
            }
        }
        /// <summary>
        /// 清除单一键缓存
        /// </summary>
        /// <param name="key">
        public static void RemoveKeyCache(string CacheKey)
        {
            try
            {
                System.Web.Caching.Cache objCache = HttpRuntime.Cache;
                objCache.Remove(CacheKey);
            }
            catch { }
        }

        /// <summary>
        /// 清除所有缓存
        /// </summary>
        public static void RemoveAllCache()
        {
            System.Web.Caching.Cache _cache = HttpRuntime.Cache;
            IDictionaryEnumerator CacheEnum = _cache.GetEnumerator();
            if (_cache.Count > 0)
            {
                ArrayList al = new ArrayList();
                while (CacheEnum.MoveNext())
                {
                    al.Add(CacheEnum.Key);
                }
                foreach (string key in al)
                {
                    _cache.Remove(key);
                }
            }
        }
        /// <summary>  
        /// 清除所有缓存
        /// </summary>  
        public static void RemoveAllCache2()
        {
            var cache = HttpRuntime.Cache;
            var cacheEnum = cache.GetEnumerator();
            while (cacheEnum.MoveNext())
            {
                cache.Remove(cacheEnum.Key.ToString());
            }
        }
        /// <summary>
        /// 以列表形式返回已存在的所有缓存 
        /// </summary>
        /// <returns></returns> 
        public static ArrayList ShowAllCache()
        {
            ArrayList al = new ArrayList();
            System.Web.Caching.Cache _cache = HttpRuntime.Cache;
            if (_cache.Count > 0)
            {
                IDictionaryEnumerator CacheEnum = _cache.GetEnumerator();
                while (CacheEnum.MoveNext())
                {
                    al.Add(CacheEnum.Key);
                }
            }
            return al;
        }
    }
}