public void Set(string key, Dictionary <string, Value> val, TimeSpan?expireTime = null)
        {
            if (val == null)
            {
                return;
            }
            if (_entryptType == EncryptType.MD5)
            {
                var enctryptKey = MD5Encrypt(key);
                _hash.Hset(enctryptKey, val);

                if (expireTime != null)
                {
                    SetExpire(enctryptKey, expireTime.Value);
                }
            }
        }