CacheHelper

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);
                }
            }
        }
    }
}