本文目录
1. 摘要
2. Redis配置
3. RedisHelper
4．使用实例5. 总结
1. 摘要
由于內存存取速度远高于磁盘读取的特性，为了程序效率提高性能，通常会把常用的不常变动的数据存储在系统内存中，提升数据读取的速度，在C#下常见的内存操作有微软自带的内存处理、分布式缓存Memcached以及Redis,这里我们介绍Redis分布式缓存，另外两种缓存处理参考《Asp.Net Core 2.0 项目实战（8）Core下缓存操作、序列化操作、JSON操作等Helper集合类》介绍了基于Microsoft.Extensions.Caching.Memory封装CacheHelper缓存帮助类；《Asp.Net Core 2.0 项目实战（5）Memcached踩坑，基于EnyimMemcachedCore整理MemcachedHelper帮助类。》Memcached帮助类。
2. Redis配置
在appsettings.json添加相关配置，配置读写redis服务器,多服务器用逗号隔开。
//redis分布式缓存 ?"RedisConfig": { ???//是否打开缓存1是0否 ???"IsOpenCache": "0", ???"ReadWriteHosts": "192.168.1.2:6379,192.168.1.3:6379,password=123456", ???"ReadOnlyHosts": "192.168.1.2:6379,password=123456" ?}3. RedisHelper
添加Nuget包StackExchange.Redis和Newtonsoft.Json；设置Key/Value，删除redis缓存。本帮助类我仅本地两台电脑测试过，生产环境暂未使用，现仅供参考。
using System;using System.Collections.Generic;using Microsoft.Extensions.Logging;using StackExchange.Redis;using Newtonsoft.Json;namespace NC.Common{ ???public class RedisHelper ???{ ???????//单例模式 ???????public static RedisCommon Default{get { return new RedisCommon(); } } ???????public static RedisCommon One { get { return new RedisCommon(1, "127.0.0.1:6379"); } } ???????public static RedisCommon Two { get { return new RedisCommon(2, "127.0.0.1:6379"); } } ???} ???/// <summary> ???/// Redis操作类 ???/// 老版用的是ServiceStack.Redis。 ???/// Net Core使用StackExchange.Redis的nuget包 ???/// </summary> ???public class RedisCommon ???{ ???????public static ILogger Log = UtilLogger<RedisCommon>.Log;//日志记录 ???????//redis数据库连接字符串 ???????private string _conn = UtilConf.Configuration["RedisConfig:ReadWriteHosts"] ?? "127.0.0.1:6379"; ???????private int _db = 0; ???????//静态变量 保证各模块使用的是不同实例的相同链接 ???????private static ConnectionMultiplexer connection; ???????public RedisCommon() { } ???????/// <summary> ???????/// 构造函数 ???????/// </summary> ???????/// <param name="db"></param> ???????/// <param name="connectStr"></param> ???????public RedisCommon(int db, string connectStr) ???????{ ???????????_conn = connectStr; ???????????_db = db; ???????} ???????/// <summary> ???????/// 缓存数据库，数据库连接 ???????/// </summary> ???????public ConnectionMultiplexer CacheConnection ???????{ ???????????get ???????????{ ???????????????try ???????????????{ ???????????????????if (connection == null || !connection.IsConnected) ???????????????????{ ???????????????????????connection = new Lazy<ConnectionMultiplexer>(() => ConnectionMultiplexer.Connect(_conn)).Value; ???????????????????} ???????????????} ???????????????catch (Exception ex) ???????????????{ ???????????????????Log.LogError("RedisHelper->CacheConnection 出错\r\n" + ex.ToString()); ???????????????????return null; ???????????????} ???????????????return connection; ???????????} ???????} ???????/// <summary> ???????/// 缓存数据库 ???????/// </summary> ???????public IDatabase CacheRedis => CacheConnection.GetDatabase(_db); ???????#region --KEY/VALUE存取-- ???????/// <summary> ???????/// 单条存值 ???????/// </summary> ???????/// <param name="key">key</param> ???????/// <param name="value">The value.</param> ???????/// <returns><c>true</c> if XXXX, <c>false</c> otherwise.</returns> ???????public bool StringSet(string key, string value) ???????{ ???????????return CacheRedis.StringSet(key, value); ???????} ???????/// <summary> ???????/// 保存单个key value ???????/// </summary> ???????/// <param name="key">Redis Key</param> ???????/// <param name="value">保存的值</param> ???????/// <param name="expiry">过期时间</param> ???????/// <returns></returns> ???????public bool StringSet(string key, string value, TimeSpan? expiry = default(TimeSpan?)) ???????{ ???????????return CacheRedis.StringSet(key, value, expiry); ???????} ???????/// <summary> ???????/// 保存多个key value ???????/// </summary> ???????/// <param name="arr">key</param> ???????/// <returns></returns> ???????public bool StringSet(KeyValuePair<RedisKey, RedisValue>[] arr) ???????{ ???????????return CacheRedis.StringSet(arr); ???????} ???????/// <summary> ???????/// 批量存值 ???????/// </summary> ???????/// <param name="keysStr">key</param> ???????/// <param name="valuesStr">The value.</param> ???????/// <returns><c>true</c> if XXXX, <c>false</c> otherwise.</returns> ???????public bool StringSetMany(string[] keysStr, string[] valuesStr) ???????{ ???????????var count = keysStr.Length; ???????????var keyValuePair = new KeyValuePair<RedisKey, RedisValue>[count]; ???????????for (int i = 0; i < count; i++) ???????????{ ???????????????keyValuePair[i] = new KeyValuePair<RedisKey, RedisValue>(keysStr[i], valuesStr[i]); ???????????} ???????????return CacheRedis.StringSet(keyValuePair); ???????} ???????/// <summary> ???????/// 保存一个对象 ???????/// </summary> ???????/// <typeparam name="T"></typeparam> ???????/// <param name="key"></param> ???????/// <param name="obj"></param> ???????/// <returns></returns> ???????public bool SetStringKey<T>(string key, T obj, TimeSpan? expiry = default(TimeSpan?)) ???????{ ???????????string json = JsonConvert.SerializeObject(obj); ???????????return CacheRedis.StringSet(key, json, expiry); ???????} ???????/// <summary> ???????/// 追加值 ???????/// </summary> ???????/// <param name="key"></param> ???????/// <param name="value"></param> ???????public void StringAppend(string key, string value) ???????{ ???????????////追加值，返回追加后长度 ???????????long appendlong = CacheRedis.StringAppend(key, value); ???????} ???????/// <summary> ???????/// 获取单个key的值 ???????/// </summary> ???????/// <param name="key">Redis Key</param> ???????/// <returns></returns> ???????public RedisValue GetStringKey(string key) ???????{ ???????????return CacheRedis.StringGet(key); ???????} ???????/// <summary> ???????/// 根据Key获取值 ???????/// </summary> ???????/// <param name="key">键值</param> ???????/// <returns>System.String.</returns> ???????public string StringGet(string key) ???????{ ???????????try ???????????{ ???????????????return CacheRedis.StringGet(key); ???????????} ???????????catch (Exception ex) ???????????{ ???????????????Log.LogError("RedisHelper->StringGet 出错\r\n" + ex.ToString()); ???????????????return null; ???????????} ???????} ???????/// <summary> ???????/// 获取多个Key ???????/// </summary> ???????/// <param name="listKey">Redis Key集合</param> ???????/// <returns></returns> ???????public RedisValue[] GetStringKey(List<RedisKey> listKey) ???????{ ???????????return CacheRedis.StringGet(listKey.ToArray()); ???????} ???????/// <summary> ???????/// 批量获取值 ???????/// </summary> ???????public string[] StringGetMany(string[] keyStrs) ???????{ ???????????var count = keyStrs.Length; ???????????var keys = new RedisKey[count]; ???????????var addrs = new string[count]; ???????????for (var i = 0; i < count; i++) ???????????{ ???????????????keys[i] = keyStrs[i]; ???????????} ???????????try ???????????{ ???????????????var values = CacheRedis.StringGet(keys); ???????????????for (var i = 0; i < values.Length; i++) ???????????????{ ???????????????????addrs[i] = values[i]; ???????????????} ???????????????return addrs; ???????????} ???????????catch (Exception ex) ???????????{ ???????????????Log.LogError("RedisHelper->StringGetMany 出错\r\n" + ex.ToString()); ???????????????return null; ???????????} ???????} ???????/// <summary> ???????/// 获取一个key的对象 ???????/// </summary> ???????/// <typeparam name="T"></typeparam> ???????/// <param name="key"></param> ???????/// <returns></returns> ???????public T GetStringKey<T>(string key) ???????{ ???????????return JsonConvert.DeserializeObject<T>(CacheRedis.StringGet(key)); ???????} ???????#endregion ???????#region --删除设置过期-- ???????/// <summary> ???????/// 删除单个key ???????/// </summary> ???????/// <param name="key">redis key</param> ???????/// <returns>是否删除成功</returns> ???????public bool KeyDelete(string key) ???????{ ???????????return CacheRedis.KeyDelete(key); ???????} ???????/// <summary> ???????/// 删除多个key ???????/// </summary> ???????/// <param name="keys">rediskey</param> ???????/// <returns>成功删除的个数</returns> ???????public long KeyDelete(RedisKey[] keys) ???????{ ???????????return CacheRedis.KeyDelete(keys); ???????} ???????/// <summary> ???????/// 判断key是否存储 ???????/// </summary> ???????/// <param name="key">redis key</param> ???????/// <returns></returns> ???????public bool KeyExists(string key) ???????{ ???????????return CacheRedis.KeyExists(key); ???????} ???????/// <summary> ???????/// 重新命名key ???????/// </summary> ???????/// <param name="key">就的redis key</param> ???????/// <param name="newKey">新的redis key</param> ???????/// <returns></returns> ???????public bool KeyRename(string key, string newKey) ???????{ ???????????return CacheRedis.KeyRename(key, newKey); ???????} ???????/// <summary> ???????/// 删除hasekey ???????/// </summary> ???????/// <param name="key"></param> ???????/// <param name="hashField"></param> ???????/// <returns></returns> ???????public bool HaseDelete(RedisKey key, RedisValue hashField) ???????{ ???????????return CacheRedis.HashDelete(key, hashField); ???????} ???????/// <summary> ???????/// 移除hash中的某值 ???????/// </summary> ???????/// <typeparam name="T"></typeparam> ???????/// <param name="key"></param> ???????/// <param name="dataKey"></param> ???????/// <returns></returns> ???????public bool HashRemove(string key, string dataKey) ???????{ ???????????return CacheRedis.HashDelete(key, dataKey); ???????} ???????/// <summary> ???????/// 设置缓存过期 ???????/// </summary> ???????/// <param name="key"></param> ???????/// <param name="datetime"></param> ???????public void SetExpire(string key, DateTime datetime) ???????{ ???????????CacheRedis.KeyExpire(key, datetime); ???????} ???????#endregion ???}}4. 使用实例
在HomeCtroller控制器中添加测试redis方法如下：写；读；删除。
???public IActionResult Index() ???????{ ???????????#region --测试redis-- ???????????RedisHelper.Default.StringSet("redis", "redis" + DateTime.Now, TimeSpan.FromSeconds(1000000)); ???????????ViewData["redis"] = RedisHelper.Default.StringGet("redis"); ???????????//RedisHelper.Default.KeyDelete("redis"); ???????????#endregion ???????????return View(); ???????} ????5. 总结
Redis读写速度快性能高，但部署到生产环境中要注意端口、密码设置，最好是部署在内网环境中，另由于之前都是使用ServiceStack.Redis，由于ServiceStack.Redis v4版本后是收费版的，好像还有每小时6000次访问请求的问题需注意，具体这俩请自行搜索对比。Redis 有五种常用数据类型，字符串类型（string），散列类型（hash），列表类型（list），集合类型（set），有序集合类型（zset）参考：https://www.cnblogs.com/mingtianct/p/6291593.html；这里我暂只处理了string类型，上面我测试的方法有限，其他类型各位可自行补充，网上有很多案例。
Asp.Net Core 2.0 项目实战（6）Redis配置、封装帮助类RedisHelper及使用实例
原文地址：https://www.cnblogs.com/oorz/p/9052498.html