C# 简单操作缓存数据库Redis

一、安装

Nuget包管理器添加StackExchange.Redis的引用

二、写入

/// <summary>
/// 向Redis写入
/// </summary>
/// <param name="key">键值</param>
/// <param name="value">值</param>
/// <param name="date">过期日期</param>
public static void SetString(string key,string value,DateTime? date = null)
{
    //ConnectionMultiplexer.Connect("Localhost:6379,password=123456"))
    using (var redis = ConnectionMultiplexer.Connect("Localhost"))
    {
        //写入
        var db = redis.GetDatabase();
        db.StringSet("key", "123456");
        //设置过期日期
        if (date != null)
        {
            DateTime time = DateTime.Now.AddSeconds(20);
            db.KeyExpire("key", time);
        }
        var result = db.StringGet("key");
    }
}

三、读取

/// <summary>
/// 读取redis的内容
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
public static string GetString(string key)
{
    using (var redis = ConnectionMultiplexer.Connect("Localhost"))
    {
        //读取
        var db = redis.GetDatabase();
        var result = db.StringGet(key);
        return result;
    }
}

四、Redis封装类

using ServiceStack.Redis;
using Newtonsoft.Json;

    /// <summary>
    /// Redis 操作类
    /// </summary>
    public class RedisHelper
    {
        /// <summary>
        /// 连接字符串
        /// </summary>
        private static readonly string ConnectionString = ConfigurationManager.ConnectionStrings["RedisConnectionString"].ConnectionString;
        /// <summary>
        /// 锁
        /// </summary>
        private readonly object _lock = new object();
        /// <summary>
        /// 连接对象
        /// </summary>
        private volatile IConnectionMultiplexer _connection;
        /// <summary>
        /// 数据库
        /// </summary>
        private IDatabase _db;
        public RedisHelper()
        {
            _connection = ConnectionMultiplexer.Connect(ConnectionString);
            _db = GetDatabase();
        }
        /// <summary>
        /// 获取连接
        /// </summary>
        /// <returns></returns>
        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;
        }
        /// <summary>
        /// 获取数据库
        /// </summary>
        /// <param name="db"></param>
        /// <returns></returns>
        public IDatabase GetDatabase(int? db = null)
        {
            return GetConnection().GetDatabase(db ?? -1);
        }
        /// <summary>
        /// 设置
        /// </summary>
        /// <param name="key">键</param>
        /// <param name="data">值</param>
        /// <param name="cacheTime">时间</param>
        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);
        }
        /// <summary>
        /// 根据键获取值
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key"></param>
        /// <returns></returns>
        public virtual T Get<T>(string key)
        {

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

            var result = Deserialize<T>(rValue);

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

五、查看Redis数据

可以通过  Redis Desktop Manager 数据库管理工具查看。

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