using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;
using System.Web.Caching;

namespace Server.Utils
{
    /// <summary>
    /// 缓存操作,默认缓存1分钟
    /// </summary>
    public  class CacheHelper
    {
        #region 单例
        private static CacheHelper ini;

        public static CacheHelper GetIntance()
        {
            if (ini == null)
            {
                ini = new CacheHelper();
            }
            return ini;
        }

        private CacheHelper() { }
        #endregion

        /// <summary>
        /// 缓存容器
        /// </summary>
        static System.Web.Caching.Cache objCache = new System.Web.Caching.Cache();


        /// <summary>  
        /// 设置数据缓存  
        /// </summary> 
        public void SetCache(string CacheKey, object objObject, int timeout = 7200)
        {

            if (objCache.Get(CacheKey) != null)
            {
                objCache.Remove(CacheKey);
            }
            objCache.Insert(CacheKey, objObject, null, DateTime.Now.AddSeconds(timeout), TimeSpan.Zero);
        }

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


        /// <summary>
        /// 清除单一键缓存
        /// </summary>
        /// <param name="key">
        public void RemoveKeyCache(string CacheKey)
        {
            try
            {
                objCache.Remove(CacheKey);
            }
            catch { }
        }


        /// <summary>
        /// 清除所有缓存
        /// </summary>
        public void RemoveAllCache()
        {
            IDictionaryEnumerator CacheEnum = objCache.GetEnumerator();
            if (objCache.Count > 0)
            {
                ArrayList al = new ArrayList();
                while (CacheEnum.MoveNext())
                {
                    al.Add(CacheEnum.Key);
                }
                foreach (string key in al)
                {
                    objCache.Remove(key);
                }
            }

        }


        /// <summary>
        /// 以列表形式返回已存在的所有缓存 
        /// </summary>
        /// <returns></returns> 
        public ArrayList ShowAllCache()
        {
            ArrayList al = new ArrayList();

            if (objCache.Count > 0)
            {
                IDictionaryEnumerator CacheEnum = objCache.GetEnumerator();
                while (CacheEnum.MoveNext())
                {
                    al.Add(CacheEnum.Key);
                }
            }
            return al;
        }



    }
}