Redis(二)：c#连接Redis

2021-07-02 10:07

阅读：521

标签：oid new conf type var 反序列化对象 base object

1、nuget StackExchange.Redis

2、建立RedisHelper类：

public class RedisHelper
    {
        /// 
        /// 连接字符串
        /// 
        private static readonly string ConnectionString = ConfigurationManager.ConnectionStrings["RedisConnectionString"].ConnectionString;
        /// 
        /// 锁
        /// 
        private readonly object _lock = new object();
        /// 
        /// 连接对象
        /// 
        private volatile IConnectionMultiplexer _connection;
        /// 
        /// 数据库
        /// 
        private IDatabase _db;
        public RedisHelper()
        {
            _connection = ConnectionMultiplexer.Connect(ConnectionString);
            _db = GetDatabase();
        }
        /// 
        /// 获取连接
        /// 
        /// 
        protected IConnectionMultiplexer GetConnection()
        {
            if (_connection != null && _connection.IsConnected)
            {
                return _connection;
            }
            lock (_lock)
            {
                if (_connection != null && _connection.IsConnected)
                {
                    return _connection;
                }

                if (_connection != null)
                {
                    _connection.Dispose();
                }
                _connection = ConnectionMultiplexer.Connect(ConnectionString);
            }

            return _connection;
        }
        /// 
        /// 获取数据库
        /// 
        /// 
        /// 
        public IDatabase GetDatabase(int? db = null)
        {
            return GetConnection().GetDatabase(db ?? -1);
        }
        /// 
        /// 设置
        /// 
        /// 键
        /// 值
        /// 时间
        public virtual void Set(string key, object data, int cacheTime)
        {
            if (data == null)
            {
                return;
            }
            var entryBytes = Serialize(data);
            var expiresIn = TimeSpan.FromMinutes(cacheTime);

            _db.StringSet(key, entryBytes, expiresIn);
        }
        /// 
        /// 根据键获取值
        /// 
        /// 
        /// 
        /// 
        public virtual T Get(string key)
        {

            var rValue = _db.StringGet(key);
            if (!rValue.HasValue)
            {
                return default(T);
            }

            var result = Deserialize(rValue);

            return result;
        }
        /// 
        /// 反序列化
        /// 
        /// 
        /// 
        /// 
        protected virtual T Deserialize(byte[] serializedObject)
        {
            if (serializedObject == null)
            {
                return default(T);
            }
            var json = Encoding.UTF8.GetString(serializedObject);
            return JsonConvert.DeserializeObject(json);
        }
        /// 
        /// 判断是否已经设置
        /// 
        /// 
        /// 
        public virtual bool IsSet(string key)
        {
            return _db.KeyExists(key);
        }
        /// 
        /// 序列化
        /// 
        /// 
        /// byte[]
        private byte[] Serialize(object data)
        {
            var json = JsonConvert.SerializeObject(data);
            return Encoding.UTF8.GetBytes(json);
        }
    }