上一篇讲述了安装redis《Redis总结（一）Redis安装》，同时也大致介绍了redis的优势和应用场景。本篇着重讲解.NET中如何使用redis和C#。
Redis官网提供了很多开源的C#客户端。例如，Nhiredis ，ServiceStack.Redis ，StackExchange.Redis等。其中ServiceStack.Redis应该算是比较流行的。它提供了一整套从Redis数据结构都强类型对象转换的机制并将对象json序列化。所以这里只介绍ServiceStack.Redis，它也是目前我们产品中所使用的客户端。
ServiceStack.Redis地址：https://github.com/ServiceStack/ServiceStack.Redis
1. 建立一个控制台应用程序，并引用以下ServiceStack.Redis相关的四个类库。或者通过Nuget进行安装Redis常用组件ServiceStack.Redis。 下载示例代码。
2. 创建一个Redis操作的公用类RedisCacheHelper，
using System;using System.Collections.Generic;using System.Configuration;using System.Linq;using System.Text;using System.Web;using ServiceStack.Common.Extensions;using ServiceStack.Redis;using ServiceStack.Logging;namespace Weiz.Redis.RedisTest{ public class RedisCacheHelper { PRivate static readonly PooledRedisClientManager pool = null; private static readonly string[] redisHosts = null; public static int RedisMaxReadPool = int.Parse(ConfigurationManager.AppSettings["redis_max_read_pool"]); public static int RedisMaxWritePool = int.Parse(ConfigurationManager.AppSettings["redis_max_write_pool"]); static RedisCacheHelper() { var redisHostStr = ConfigurationManager.AppSettings["redis_server_session"]; if (!string.IsNullOrEmpty(redisHostStr)) { redisHosts = redisHostStr.Split(','); if (redisHosts.Length > 0) { pool = new PooledRedisClientManager(redisHosts, redisHosts, new RedisClientManagerConfig() { MaxWritePoolSize = RedisMaxWritePool, MaxReadPoolSize = RedisMaxReadPool, AutoStart = true }); } } } public static void Add<T>(string key, T value, DateTime expiry) { if (value == null) { return; } if (expiry <= DateTime.Now) { Remove(key); return; } try { if (pool != null) { using (var r = pool.GetClient()) { if (r != null) { r.SendTimeout = 1000; r.Set(key, value, expiry - DateTime.Now); } } } } catch (Exception ex) { string msg = string.Format("{0}:{1}发生异常!{2}", "cache", "存储", key); } } public static void Add<T>(string key, T value, TimeSpan slidingExpiration) { if (value == null) { return; } if (slidingExpiration.TotalSeconds <= 0) { Remove(key); return; } try { if (pool != null) { using (var r = pool.GetClient()) { if (r != null) { r.SendTimeout = 1000; r.Set(key, value, slidingExpiration); } } } } catch (Exception ex) { string msg = string.Format("{0}:{1}发生异常!{2}", "cache", "存储", key); } } public static T Get<T>(string key) { if (string.IsNullOrEmpty(key)) { return default(T); } T obj = default(T); try { if (pool != null) { using (var r = pool.GetClient()) { if (r != null) { r.SendTimeout = 1000; obj = r.Get<T>(key); } } } } catch (Exception ex) { string msg = string.Format("{0}:{1}发生异常!{2}", "cache", "获取", key); } return obj; } public static void Remove(string key) { try { if (pool != null) { using (var r = pool.GetClient()) { if (r != null) { r.SendTimeout = 1000; r.Remove(key); } } } } catch (Exception ex) { string msg = string.Format("{0}:{1}发生异常!{2}", "cache", "删除", key); } } public static bool Exists(string key) { try { if (pool != null) { using (var r = pool.GetClient()) { if (r != null) { r.SendTimeout = 1000; return r.ContainsKey(key); } } } } catch (Exception ex) { string msg = string.Format("{0}:{1}发生异常!{2}", "cache", "是否存在", key); } return false; } }}说明：RedisCacheHelper 使用的是客户端链接池模式，这样的存取效率应该是最高的。同时也更方便的支持读写分离，均衡负载。
3. 配置文件
<!-- redis Start --> <add key="SessionExpireMinutes" value="180" /> <add key="redis_server_session" value="127.0.0.1:6379" /> <add key="redis_max_read_pool" value="3" /> <add key="redis_max_write_pool" value="1" /> <!--redis end-->
4. 测试程序调用
class Program { static void Main(string[] args) { Console.WriteLine("Redis写入缓存：zhong"); RedisCacheHelper.Add("zhong", "zhongzhongzhong", DateTime.Now.AddDays(1)); Console.WriteLine("Redis获取缓存：zhong"); string str3 = RedisCacheHelper.Get<string>("zhong"); Console.WriteLine(str3); Console.WriteLine("Redis获取缓存：nihao"); string str = RedisCacheHelper.Get<string>("nihao"); Console.WriteLine(str); Console.WriteLine("Redis获取缓存：wei"); string str1 = RedisCacheHelper.Get<string>("wei"); Console.WriteLine(str1); Console.ReadKey(); } }
5. 输出结果
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