public class RedisHelper
    {
        private static ConnectionMultiplexer multiplexer { get; set; }
        static RedisHelper()
        {
        }

        public static IDatabase GetDataBase(int dbNums = 1)
        {
            if (multiplexer == null)
                Init();
            return multiplexer.GetDatabase(dbNums);
        }

        public static ConnectionMultiplexer GetMultiplexer()
        {
            if (multiplexer == null)
                Init();

            return multiplexer;
        }
        public static bool IsConnect(string key, IDatabase redisDb, string module, string action)
        {
            if (!redisDb.IsConnected(key))
            {
                LogHelper.Error("current redis is not connect", null, module, action);
                return false;
            }
            return true;
        }

        private static void Init()
        {
            try
            {
                var configString = ConfigurationManager.AppSettings["RedisConfigString"];
                ConfigurationOptions options = ConfigurationOptions.Parse(configString);
                multiplexer = ConnectionMultiplexer.Connect(options);
            }
            catch (Exception ex)
            {
                LogHelper.Error(ex, "RedisHelper", "Static");
            }
        }
    }

IDatabase _cacheClient = RedisHelper.GetDataBase(4);
//key是否存在
_cacheClient.KeyExists("key")
//设置key-vaule
_cacheClient.StringSet("key", "value");
//设置过期时间
_cacheClient.KeyExpire("key", TimeSpan.FromMinutes(1));
//删除
_cacheClient.KeyDelete("key");

//发布
ConnectionMultiplexer multiplexer = RedisHelper.GetMultiplexer();
ISubscriber sub = multiplexer.GetSubscriber();
var queue = sub.Publish("channel name", "message");

//订阅
ConnectionMultiplexer multiplexer = RedisHelper.GetMultiplexer();
ISubscriber sub = multiplexer.GetSubscriber();
sub.Subscribe("channel name", (channel, message) =>
{
    //TODO
});

//取值，不存在则初始为0
long num = _cacheClient.StringIncrement("key", 0)

//判断，比如和缓存里的商品总库存比较

//计数增加
_cacheClient.StringIncrement("key", 2)