ASP.NET|ASP.NET Core中使用Redis实现缓存 ASP.NETCore中使用Redis实现缓存

一、前言
二、安装StackExchange.Redis
三、添加配置
四、Redis帮助类
五、添加服务依赖项
六、在控制器中使用
七、测试

一、前言我们这里以StackExchange.Redis为例，讲解如何在ASP.NET Core中如何使用Redis实现缓存。首先需要安装Redis和RedisDesktopManager。RedisDesktopManager用来查看Redis缓存里面的数据。如何安装Redis这里不在讲述。

二、安装StackExchange.Redis 在NuGet上安装StackExchange.Redis，如下图所示：

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安装完成以后在依赖项里面就可以看到：

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三、添加配置在appsettings.json文件里面添加Redis相关配置信息：

{"Logging": {"LogLevel": {"Default": "Warning"}},"AllowedHosts": "*","Redis": {"Default": {"Connection": "127.0.0.1:6379","InstanceName": "local","DefaultDB": 8}}}

四、Redis帮助类创建Redis帮助类，代码如下：

using StackExchange.Redis; using System; using System.Collections.Concurrent; namespace RedisDemo{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 _connections; public RedisHelper(string connectionString, string instanceName, int defaultDB = 0){_connectionString = connectionString; _instanceName = instanceName; _defaultDB = defaultDB; _connections = new ConcurrentDictionary(); }/// /// 获取ConnectionMultiplexer/// /// private ConnectionMultiplexer GetConnect(){return _connections.GetOrAdd(_instanceName, p => ConnectionMultiplexer.Connect(_connectionString)); }/// /// 获取数据库/// /// /// 默认为0：优先代码的db配置，其次config中的配置/// 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(); }}}}}

五、添加服务依赖项在Startup.cs类的ConfigureServices方法里面添加服务注入：

using Microsoft.AspNetCore.Builder; using Microsoft.AspNetCore.Hosting; using Microsoft.AspNetCore.Mvc; using Microsoft.Extensions.Configuration; using Microsoft.Extensions.DependencyInjection; namespace RedisDemo{public class Startup{public Startup(IConfiguration configuration){Configuration = configuration; }public IConfiguration Configuration { get; }// This method gets called by the runtime. Use this method to add services to the container.public void ConfigureServices(IServiceCollection services){//redis缓存var section = Configuration.GetSection("Redis:Default"); //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"); services.AddSingleton(new RedisHelper(_connectionString, _instanceName, _defaultDB)); services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1); }// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.public void Configure(IApplicationBuilder app, IHostingEnvironment env){if (env.IsDevelopment()){app.UseDeveloperExceptionPage(); }app.UseMvc(); }}}

六、在控制器中使用新建一个控制器，然后通过构造函数注入：

using Microsoft.AspNetCore.Mvc; using StackExchange.Redis; namespace RedisDemo.Controllers{[Route("api/redis")][ApiController]public class RedisController : ControllerBase{private readonly IDatabase _redis; public RedisController(RedisHelper client){_redis = client.GetDatabase(); }[HttpGet]public string Get(){// 往Redis里面存入数据_redis.StringSet("Name", "Tom"); // 从Redis里面取数据string name = _redis.StringGet("Name"); return name; }}}

七、测试运行程序，使用Postman测试控制器：