缓存帮助类

一、引用

using System;
using System.Collections;
using System.Web;

二、使用

1、Cache帮助类

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

        #region 设置数据缓存
        /// <summary>
        /// 设置数据缓存
        /// </summary>
        /// <param name="cacheKey">键</param>
        /// <param name="objObject">值</param>
        public static void SetCache(string cacheKey, object objObject)
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            objCache.Insert(cacheKey, objObject);
        }
        /// <summary>
        /// 设置数据缓存
        /// </summary>
        /// <param name="cacheKey"></param>
        /// <param name="objObject"></param>
        /// <param name="timeout"></param>
        public static void SetCache(string cacheKey, object objObject, TimeSpan timeout)
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            objCache.Insert(cacheKey, objObject, null, DateTime.MaxValue, timeout, System.Web.Caching.CacheItemPriority.NotRemovable, null);
        }
        /// <summary>
        /// 设置数据缓存
        /// </summary>
        /// <param name="cacheKey"></param>
        /// <param name="objObject"></param>
        /// <param name="absoluteExpiration"></param>
        /// <param name="slidingExpiration"></param>
        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);
        }
        #endregion

        #region 移除指定的数据缓存
        public static void RemoveAllCache(string cacheKey)
        {
            System.Web.Caching.Cache _cache = HttpRuntime.Cache;
            _cache.Remove(cacheKey);
        }
        #endregion

        #region 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());
            }
        }
        #endregion  

2、Cookie帮助类

       #region 获取cookie的值
        /// <summary>
        /// 获取cookie的值
        /// </summary>
        /// <param name="cookieName"></param>
        /// <returns></returns>
        public static string GetCookie(string cookieName)
        {
            if (HttpContext.Current.Request.Cookies != null && HttpContext.Current.Request.Cookies[cookieName] != null)
            {
                return HttpContext.Current.Request.Cookies[cookieName].Value.ToString();
            }
            return "";
        }
        #endregion

        #region 写cookie的值
        /// <summary>
        /// 写cookie的值,最大超时时间
        /// </summary>
        /// <param name="cookieName">cookie的名称</param>
        /// <param name="cookieValue">cookie的值</param> 
        /// <returns></returns>
        public static void WriteCookie(string cookieName, string cookieValue)
        {
            HttpCookie cookies = HttpContext.Current.Request.Cookies[cookieName] ?? new HttpCookie(cookieName);
            cookies.Value = cookieValue;
            cookies.Expires = DateTime.Now.AddDays(1);
            HttpContext.Current.Response.AppendCookie(cookies);
        }
        /// <summary>
        /// 写cookie的值
        /// </summary>
        /// <param name="cookieName">cookie的名称</param>
        /// <param name="cookieValue">cookie的值</param>
        /// <param name="expiresTime">超时时间，单位是分钟</param>
        /// <returns></returns>
        public static void WriteCookie(string cookieName, string cookieValue, double expiresTime)
        {
            HttpCookie cookies = HttpContext.Current.Request.Cookies[cookieName] ?? new HttpCookie(cookieName);
            cookies.Value = cookieValue;
            cookies.Expires = DateTime.Now.AddMinutes(expiresTime);
            HttpContext.Current.Response.AppendCookie(cookies);
        }
        #endregion

        #region 检查Cookie
        /// <summary>
        /// 检查Cookie
        /// </summary>
        /// <param name="cookieName"/>
        /// <returns/>
        public static bool CheckCookie(string cookieName)
        {
            return HttpContext.Current.Request.Cookies[cookieName] != null;
        }
        #endregion

        #region 移除cookie
        /// <summary>
        /// 移除cookie
        /// </summary>
        /// <param name="cookieName"></param>
        public static void RemoveCookie(string cookieName)
        {
            HttpCookie cookie = HttpContext.Current.Request.Cookies[cookieName];
            if (cookie == null)
                return;
            cookie.Expires = DateTime.Now.AddYears(-3);
            HttpContext.Current.Response.Cookies.Add(cookie);
        }
        #endregion  

3、Session帮助类

        #region 获取session的值
        /// <summary>
        /// 获取session的值
        /// </summary>
        /// <param name="sessionName"></param>
        /// <returns></returns>
        public static object GetSession(string sessionName)
        {
            if (HttpContext.Current.Session[sessionName] == null)
                return "";
            else
                return HttpContext.Current.Session[sessionName];
        }
        #endregion

        #region 写session的值
        /// <summary>
        /// 写session的值,默认设置为24*60分钟
        /// </summary>
        /// <param name="sessionValue">session的名称</param>
        /// <param name="sessionName">session的值</param> 
        /// <returns></returns>
        public static void WriteSession(string sessionName, object sessionValue)
        {
            HttpContext.Current.Session[sessionName] = sessionValue;
            HttpContext.Current.Session.Timeout = 1440;
        }
        /// <summary>
        /// 写session的值,设置超时时间
        /// </summary>
        /// <param name="sessionName">session的名称</param>
        /// <param name="sessionValue">session的值</param>
        /// <param name="expiresTime">超时时间，单位是分钟</param>
        /// <returns></returns>
        public static void WriteSession(string sessionName, object sessionValue, int expiresTime)
        {
            HttpContext.Current.Session[sessionName] = sessionValue;
            HttpContext.Current.Session.Timeout = expiresTime;
        }
        #endregion

        #region 检查session
        /// <summary>
        /// 检查session，存在返回true
        /// </summary>
        /// <param name="sessionName"/>
        /// <returns/>
        public static bool CheckSession(string sessionName)
        {
            return HttpContext.Current.Session[sessionName] != null;
        }
        #endregion

        #region 移除session
        /// <summary>
        /// 移除session
        /// </summary>
        /// <param name="sessionName"></param>
        public static void RemoveSession(string sessionName)
        {
            var session = HttpContext.Current.Session[sessionName];
            if (session == null)
                return;
            session = null;
            HttpContext.Current.Session.Remove(sessionName);
        }
        #endregion