StackExchange.Redis帮助类解决方案RedisRepository封装（字符串类型数据操作）

本文版权归博客园和作者本人共同所有，转载和爬虫请注明原文链接 http://www.cnblogs.com/tdws/tag/NoSql/

目录

一、基础配置封装

二、String字符串类型数据操作封装

三、Hash散列类型数据操作封装

四、List列表类型数据操作封装(建议自行封装)

五、Set集合类型数据操作封装(建议自行封装)

六、Sort Set集合数据类型操作封装(建议自行封装)

七、发布订阅（Pub/Sub）模式在StackExchange.Redis中的使用

八、主从配置，哨兵相关配置

二、String字符串类型数据操作封装

下面这段画如果看一遍没看懂，请看过代码后再次来阅读：

我们有必要先提到ConnectionMultiplexer类，它是StackExchange提供给我们的一个类，它将多服务器的详细信息隐藏，因为这个类为我们做了很多事情，它的设计目的是为了在调用者间共享和重用。你不用每次操作都创建这样一个ConnectionMultiplexer，它是完全线程安全的。它拥有ConnectionMultiplexer.Connect和onnectionMultiplexer.ConnectAsync来链接Redis。链接 参数是一个字符串或者一个ConfigurationOptions对象。这个类实现了IDisposable接口，你可以在你不需要的时候释放对象，通过using或者dispose。但是你不用经常来释放它，因为我们要经常复用。你有三种需求时，需要使用ConnectionMultiplexer，链接Redis,发布订阅模式，访问一个单独的服务器或者监控的目的。除了基本使用，更多的请看github文档，https://github.com/StackExchange/StackExchange.Redis/blob/master/Docs/Basics.md

我们在IRedisClient中定义如下String数据类型方法：

如果你觉得代码太多，当VS按下快捷键ctrl+M+O吧

 #region 程序集 RedisRepository, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
 // Author：吴双  2016.8.28   联系邮箱 [e-mail]
 #endregion
 using System;
 using System.Collections.Generic;
 using StackExchange.Redis;

 namespace RedisRepository
 {
     public interface IRedisClient
     {
         #region Redis String类型操作
         /// <summary>
         /// Redis String类型 新增一条记录
         /// </summary>
         /// <typeparam name="T">generic refrence type</typeparam>
         /// <param name="key">unique key of value</param>
         /// <param name="value">value of key of type object</param>
         /// <param name="expiresAt">time span of expiration</param>
         /// <param name= "when">枚举类型</param>
         /// <param name="commandFlags"></param>
         /// <returns>true or false</returns>
         bool StringSet<T>(string key, object value, TimeSpan? expiry = default(TimeSpan?), When when = When.Always, CommandFlags commandFlags = CommandFlags.None) where T : class;

         /// <summary>
         /// Redis String类型 新增一条记录
         /// </summary>
         /// <typeparam name="T">generic refrence type</typeparam>
         /// <param name="key">unique key of value</param>
         /// <param name="value">value of key of type object</param>
         /// <param name="expiresAt">time span of expiration</param>
         /// <param name= "when">枚举类型</param>
         /// <param name="commandFlags"></param>
         /// <returns>true or false</returns>
         bool StringSet<T>(string key, T value, TimeSpan? expiry = default(TimeSpan?), When when = When.Always, CommandFlags commandFlags = CommandFlags.None) where T : class;

         /// <summary>
         /// 更新时应使用此方法，代码更可读。
         /// </summary>
         /// <typeparam name="T"></typeparam>
         /// <param name="key"></param>
         /// <param name="value"></param>
         /// <param name="expiresAt"></param>
         /// <param name="when"></param>
         /// <param name="commandFlags"></param>
         /// <returns></returns>
         bool StringUpdate<T>(string key, T value, TimeSpan expiresAt, When when = When.Always, CommandFlags commandFlags = CommandFlags.None) where T : class;

         /// <summary>
         /// Redis String类型  Get
         /// </summary>
         /// <typeparam name="T"></typeparam>
         /// <param name="key"></param>
         /// <param name="commandFlags"></param>
         /// <returns>T</returns>
         T StringGet<T>(string key, CommandFlags commandFlags = CommandFlags.None) where T : class;

         /// <summary>
         /// Redis String数据类型 获取指定key中字符串长度
         /// </summary>
         /// <param name="key"></param>
         /// <param name="commandFlags"></param>
         /// <returns></returns>
         long StringLength(string key, CommandFlags commandFlags = CommandFlags.None);

         /// <summary>
         ///  Redis String数据类型  返回拼接后总长度
         /// </summary>
         /// <param name="key"></param>
         /// <param name="appendVal"></param>
         /// <param name="commandFlags"></param>
         /// <returns>总长度</returns>
         long StringAppend(string key, string appendVal, CommandFlags commandFlags = CommandFlags.None);

         /// <summary>
         /// 设置新值并且返回旧值
         /// </summary>
         /// <param name="key"></param>
         /// <param name="newVal"></param>
         /// <param name="commandFlags"></param>
         /// <returns>OldVal</returns>
         string StringGetAndSet(string key, string newVal, CommandFlags commandFlags = CommandFlags.None);

         /// <summary>
         /// 为数字增长val
         /// </summary>
         /// <param name="key"></param>
         /// <param name="val"></param>
         /// <param name="commandFlags"></param>
         /// <returns>增长后的值</returns>
         double StringIncrement(string key, double val, CommandFlags commandFlags = CommandFlags.None);

         /// <summary>
         /// Redis String数据类型
         /// 类似于模糊查询  key* 查出所有key开头的键
         /// </summary>
         /// <typeparam name="T"></typeparam>
         /// <param name="key"></param>
         /// <param name="pageSize"></param>
         /// <param name="commandFlags"></param>
         /// <returns>返回List<T></returns>
         List<T> StringGetList<T>(string key, int pageSize = , CommandFlags commandFlags = CommandFlags.None) where T : class;
         #endregion

         #region Redis各数据类型公用

         /// <summary>
         /// Redis中是否存在指定Key
         /// </summary>
         /// <param name="key"></param>
         /// <param name="commandFlags"></param>
         /// <returns></returns>
         bool KeyExists(string key, CommandFlags commandFlags = CommandFlags.None);

         /// <summary>
         /// 从Redis中移除键
         /// </summary>
         /// <param name="key"></param>
         /// <param name="commandFlags"></param>
         /// <returns></returns>
         bool KeyRemove(string key, CommandFlags commandFlags = CommandFlags.None);

         /// <summary>
         /// 从Redis中移除多个键
         /// </summary>
         /// <param name="keys"></param>
         /// <param name="commandFlags"></param>
         /// <returns></returns>
         void KeyRemove(RedisKey[] keys, CommandFlags commandFlags = CommandFlags.None);

         /// <summary>
         /// Dispose DB connection 释放DB相关链接
         /// </summary>
         void DbConnectionStop();
         #endregion
     }
 }

在RedisClient.cs中实现如下：

using System;
using System.Collections.Generic;
using System.Linq;
using Newtonsoft.Json;
using StackExchange.Redis;

namespace RedisRepository
{
    public class RedisClient : IRedisClient
    {

        #region 初始化

        private static readonly IDatabase _db;
        private static readonly ConnectionMultiplexer _redis;

        /// <summary>
        /// 构造函数，在其中注册Redis事件
        /// </summary>
        static RedisClient()
        {
            const string configuration = "{0},abortConnect=false,defaultDatabase={1},ssl=false,ConnectTimeout={2},allowAdmin=true,connectRetry={3}";
            _redis = ConnectionMultiplexer
                .Connect(string.Format(configuration, RedisClientConfigurations.Url,
                    RedisClientConfigurations.DefaultDatabase, RedisClientConfigurations.ConnectTimeout,
                    RedisClientConfigurations.ConnectRetry));
            _redis.PreserveAsyncOrder = RedisClientConfigurations.PreserveAsyncOrder;
            //_redis.ConnectionFailed;
            _db = _redis.GetDatabase();
        }

        #endregion

        #region Redis String数据类型操作

        /// <summary>
        /// Redis String类型 新增一条记录
        /// </summary>
        /// <typeparam name="T">generic refrence type</typeparam>
        /// <param name="key">unique key of value</param>
        /// <param name="value">value of key of type T</param>
        /// <param name="expiresAt">time span of expiration</param>
        /// <returns>true or false</returns>
        public bool StringSet<T>(string key, T value, TimeSpan? expiresAt = default(TimeSpan?), When when = When.Always, CommandFlags commandFlags = CommandFlags.None) where T : class
        {
            var stringContent = SerializeContent(value);
            return _db.StringSet(key, stringContent, expiresAt, when, commandFlags);
        }

        /// <summary>
        /// Redis String类型 新增一条记录
        /// </summary>
        /// <typeparam name="T">generic refrence type</typeparam>
        /// <param name="key">unique key of value</param>
        /// <param name="value">value of key of type object</param>
        /// <param name="expiresAt">time span of expiration</param>
        /// <returns>true or false</returns>
        public bool StringSet<T>(string key, object value, TimeSpan? expiresAt = default(TimeSpan?), When when = When.Always, CommandFlags commandFlags = CommandFlags.None) where T : class
        {
            var stringContent = SerializeContent(value);

            return _db.StringSet(key, stringContent, expiresAt, when, commandFlags);
        }

        /// <summary>
        /// Redis String数据类型 获取指定key中字符串长度
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public long StringLength(string key, CommandFlags commandFlags = CommandFlags.None)
        {
            return _db.StringLength(key, commandFlags);
        }

        /// <summary>
        ///  Redis String数据类型  返回拼接后总长度
        /// </summary>
        /// <param name="key"></param>
        /// <param name="appendVal"></param>
        /// <returns>总长度</returns>
        public long StringAppend(string key, string appendVal, CommandFlags commandFlags = CommandFlags.None)
        {
            return _db.StringAppend(key, appendVal, commandFlags);
        }

        /// <summary>
        /// 设置新值并且返回旧值
        /// </summary>
        /// <param name="key"></param>
        /// <param name="newVal"></param>
        /// <param name="commandFlags"></param>
        /// <returns>OldVal</returns>
        public string StringGetAndSet(string key, string newVal, CommandFlags commandFlags = CommandFlags.None)
        {
            return DeserializeContent<string>(_db.StringGetSet(key, newVal, commandFlags));
        }

        /// <summary>
        /// 更新时应使用此方法，代码更可读。
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key"></param>
        /// <param name="value"></param>
        /// <param name="expiresAt"></param>
        /// <param name="when"></param>
        /// <param name="commandFlags"></param>
        /// <returns></returns>
        public bool StringUpdate<T>(string key, T value, TimeSpan expiresAt, When when = When.Always, CommandFlags commandFlags = CommandFlags.None) where T : class
        {
            var stringContent = SerializeContent(value);
            return _db.StringSet(key, stringContent, expiresAt, when, commandFlags);
        }

        /// <summary>
        /// 为数字增长val
        /// </summary>
        /// <param name="key"></param>
        /// <param name="val">可以为负</param>
        /// <param name="commandFlags"></param>
        /// <returns>增长后的值</returns>
        public double StringIncrement(string key, double val, CommandFlags commandFlags = CommandFlags.None)
        {
            return _db.StringIncrement(key, val, commandFlags);
        }

        /// <summary>
        /// Redis String类型  Get
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key"></param>
        /// <returns>T</returns>
        public T StringGet<T>(string key, CommandFlags commandFlags = CommandFlags.None) where T : class
        {
            try
            {
                RedisValue myString = _db.StringGet(key, commandFlags);
                if (myString.HasValue && !myString.IsNullOrEmpty)
                {
                    return DeserializeContent<T>(myString);
                }
                else
                {
                    return null;
                }
            }
            catch (Exception)
            {
                // Log Exception
                return null;
            }
        }

        /// <summary>
        ///  Redis String类型
        /// 类似于模糊查询  key* 查出所有key开头的键
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key"></param>
        /// <param name="pageSize"></param>
        /// <param name="commandFlags"></param>
        /// <returns>List<T></returns>
        public List<T> StringGetList<T>(string key, int pageSize = , CommandFlags commandFlags = CommandFlags.None) where T : class
        {
            try
            {
                var server = _redis.GetServer(host: RedisClientConfigurations.Url,
                                              port: RedisClientConfigurations.Port);
                var keys = server.Keys(_db.Database, key, pageSize, commandFlags);
                var keyValues = _db.StringGet(keys.ToArray(), commandFlags);

                var result = new List<T>();
                foreach (var redisValue in keyValues)
                {
                    if (redisValue.HasValue && !redisValue.IsNullOrEmpty)
                    {
                        var item = DeserializeContent<T>(redisValue);
                        result.Add(item);
                    }
                }

                return result;
            }
            catch (Exception)
            {
                // Log Exception
                return null;
            }
        }

        #endregion

        #region Redis Hash散列数据类型操作

        #endregion

        #region Redis List列表数据类型操作

        #endregion

        #region Redis Set集合数据类型操作

        #endregion

        #region Redis Sort Set有序集合数据类型操作

        #endregion

        #region Redis各数据类型公用

        /// <summary>
        /// Redis中是否存在指定Key
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public bool KeyExists(string key, CommandFlags commandFlags = CommandFlags.None)
        {
            return _db.KeyExists(key, commandFlags);
        }

        /// <summary>
        /// Dispose DB connection 释放DB相关链接
        /// </summary>
        public void DbConnectionStop()
        {
            _redis.Dispose();
        }

        /// <summary>
        /// 从Redis中移除键
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public bool KeyRemove(string key, CommandFlags commandFlags = CommandFlags.None)
        {
            return _db.KeyDelete(key, commandFlags);
        }
        /// <summary>
        /// 从Redis中移除多个键
        /// </summary>
        /// <param name="keys"></param>
        public void KeyRemove(RedisKey[] keys, CommandFlags commandFlags = CommandFlags.None)
        {
            _db.KeyDelete(keys, commandFlags);
        }
        #endregion

        #region 私有公用方法

        // serialize and Deserialize content in separate functions as redis can save value as array of binary.
        // so, any time you need to change the way of handling value, do it here.

        private string SerializeContent(object value)
        {
            return JsonConvert.SerializeObject(value);
        }

        private T DeserializeContent<T>(RedisValue myString)
        {
            return JsonConvert.DeserializeObject<T>(myString);
        }

        #endregion
    }
}

下面简单介绍一下本文中的方法细节之处。

首先在RedisClient类的构造方法中初始化Redis数据操作对象_db。每个方法更多的详尽信息请注意方法注释。如果关于Redis命令还不了解，请看前期Redis命令拾遗系列文章 http://www.cnblogs.com/tdws/tag/NoSql/

有园友指出问题说

Because the ConnectionMultiplexer does a lot, it is designed to be shared and reused between callers. You should not create a ConnectionMultiplexer per operation. It is fully thread-safe and ready for this usage.
这是官方文档的原话，ConnectionMultiplexer比较“重”，建议共用，不要每次操作就创建一个

所以暂时将构造函数改为静态构造。如果有问题，欢迎提之处

30日，反思了一下，还是加锁的单例更为合适。