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ASP.NET Core中使用Redis实现缓存_实用技巧_

2023-05-24 292人已围观

简介 ASP.NET Core中使用Redis实现缓存_实用技巧_

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：

安装完成以后在依赖项里面就可以看到：

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; } } }