using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Web;using System.Web.Caching;namespace ClusterService.Common{    public static class CacheHelper    {        public static object Cache(string key)        {            return HttpRuntime.Cache[key];        }        public static void Cache(string key, object value)        {            HttpRuntime.Cache.Insert(key, value);        }        public static void Cache(string key, object value, DateTime utcDate)        {            HttpRuntime.Cache.Insert(key, value, null, utcDate, System.Web.Caching.Cache.NoSlidingExpiration);        }        public static void Cache(string key, object value, TimeSpan span)        {            HttpRuntime.Cache.Insert(key, value, null, System.Web.Caching.Cache.NoAbsoluteExpiration, span);        }        public static void Cache(string key, object value, DateTime utcDate, CacheItemPriority priority, CacheItemRemovedCallback callback)        {            HttpRuntime.Cache.Insert(key, value, null, utcDate, System.Web.Caching.Cache.NoSlidingExpiration, priority, callback);        }        public static void Cache(string key, object value, TimeSpan span, CacheItemPriority priority, CacheItemRemovedCallback callback)        {            HttpRuntime.Cache.Insert(key, value, null, System.Web.Caching.Cache.NoAbsoluteExpiration, span, priority, callback);        }        public static void Expire(string key)        {            var cache = HttpRuntime.Cache;            if (cache[key] != null)            {                cache.Remove(key);            }        }        [Obsolete("谨慎使用")]        public static void ExpireStartsWith(string key)        {            var cache = HttpRuntime.Cache;            var tor = cache.GetEnumerator();            while (tor.MoveNext())            {                string itemKey = tor.Key.ToString();                if (itemKey.StartsWith(key))                {                    cache.Remove(itemKey);                }            }        }    }}