1、安装redis

Redis在windows平台上不受官方支持，所以想要在window安装Redis就必须去下载windows提供的安装包。安装地址：https://github.com/tporadowski/redis/releases

2、在NueGet安装包

3、在appsettings.json文件里面添加Redis相关配置信息

"Redis": {
    "Connection": "127.0.0.1:6379,password=foobared", //连接地址，端口号，密码
    "InstanceName": "local", //实例名称
    "DefaultDB": "8" //db8数据库
  }

redis的密码，可在安装目录下找到redis.windows.conf文件打开查看

4、创建RedisHelper类，代码如下：

using StackExchange.Redis;
using System.Collections.Concurrent;

namespace WebApi.Redis
{
    public class RedisHelper : IDisposable
    {
        //连接字符串
        private string _connectionString;
        //实例名称
        private string _instanceName;
        //默认数据库
        private int _defaultDB;

        private ConcurrentDictionary<string, ConnectionMultiplexer> _connections;
        public RedisHelper(string connectionString, string instanceName,  int defaultDB = 0)
        {
            _connectionString = connectionString;
            _instanceName = instanceName;
            _defaultDB = defaultDB;
            _connections = new ConcurrentDictionary<string, ConnectionMultiplexer>();
        }

        /// <summary>
        /// 获取ConnectionMultiplexer
        /// </summary>
        /// <returns></returns>
        private ConnectionMultiplexer GetConnect()
        {
            return _connections.GetOrAdd(_instanceName, p => ConnectionMultiplexer.Connect(_connectionString));
        }

        /// <summary>
        /// 获取数据库
        /// </summary>
        /// <param name="configName"></param>
        /// <param name="db">默认为0：优先代码的db配置，其次config中的配置</param>
        /// <returns></returns>
        public IDatabase GetDatabase()
        {
            return GetConnect().GetDatabase(_defaultDB);
        }

        public IServer GetServer(string configName = null, int endPointsIndex = 0)
        {
            var confOption = ConfigurationOptions.Parse(_connectionString);
            return GetConnect().GetServer(confOption.EndPoints[endPointsIndex]);
        }

        public ISubscriber GetSubscriber(string configName = null)
        {
            return GetConnect().GetSubscriber();
        }
        public void Dispose()
        {
            if (_connections != null && _connections.Count > 0)
            {
                foreach (var item in _connections.Values)
                {
                    item.Close();
                }
            }
        }
    }
}

5、在program.cs中添加依赖

//redis缓存
var section = builder.Configuration.GetSection("Redis");
//连接字符串
string _connectionString = section.GetSection("Connection").Value;
//实例名称
string _instanceName = section.GetSection("InstanceName").Value;
//默认数据库 
int _defaultDB = int.Parse(section.GetSection("DefaultDB").Value ?? "0");
builder.Services.AddSingleton(new RedisHelper(_connectionString, _instanceName, _defaultDB));

6、控制器中可用直接注入依赖使用

using Microsoft.AspNetCore.Mvc;
using StackExchange.Redis;
using WebApi.Redis;

namespace WebApi.Controllers
{
    [Route("api/[controller]/[action]")]
    [ApiController]
    public class TestController : ControllerBase
    {
        private readonly IDatabase _redis;
        public TestController(RedisHelper redis) {
            _redis = redis.GetDatabase();
        }
        [HttpGet]
        public Person GetPerson()
        {
            string? name = _redis.StringGet("name");
            return new Person(name, 18);
        }
        [HttpPost]
        public string SavePerson(string name)
        {
            _redis.StringSet("name",name);
            return "保存成功！" + name;
        }
    }
}

7.运行测试（运行时候，确保redis服务打开）