缓存读写代码

public class DoCatch
    {
        /// <summary>
        /// 获取当前应用程序指定CacheKey的Cache对象值
        /// </summary>
        /// <param name="CacheKey">索引键值</param>
        /// <returns>返回缓存对象</returns>
        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对象值
        /// </summary>
        /// <param name="CacheKey">索引键值</param>
        /// <param name="objObject">缓存对象</param>
        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对象值
        /// </summary>
        /// <param name="CacheKey">索引键值</param>
        /// <param name="objObject">缓存对象</param>
        /// <param name="absoluteExpiration">绝对过期时间</param>
        /// <param name="slidingExpiration">最后一次访问所插入对象时与该对象过期时之间的时间间隔</param>
        public static void SetCache(string CacheKey, object objObject, DateTime absoluteExpiration, TimeSpan slidingExpiration)
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            if (objObject != null)
                objCache.Insert(CacheKey, objObject, null, absoluteExpiration, slidingExpiration);
        }

        public static void ClearCache(string key)
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            objCache.Remove(key);
        }
    }