asp.net core 9中，引入了HyBridCache，本质上他并不是全新的一种缓存，而以与原来的缓存复合使用。
<ProjectSdk="Microsoft.NET.Sdk.Web"><PropertyGroup><TargetFramework>net9.0</TargetFramework><Nullable>enable</Nullable><ImplicitUsings>enable</ImplicitUsings></PropertyGroup><ItemGroup><PackageReferenceInclude="Microsoft.Extensions.Caching.StackExchangeRedis"Version="9.0.0-preview.4.24267.6" /></ItemGroup></Project>
下面的例子，time0是内存缓存，time1是基于Redis分布式缓存，time3是混合式缓存。
如果说time0，time1是自己当家做主的话，那么tim2就要基于Memory或Distributed缓存了。默认状况下，builder.Services.AddHybridCache是基于内存缓存的，如果想基于别的分布式缓存，只需要添加对应的Service就可以了。
using Microsoft.Extensions.Caching.Distributed;using Microsoft.Extensions.Caching.Hybrid;using Microsoft.Extensions.Caching.Memory;var builder = WebApplication.CreateBuilder(args);builder.Services.AddMemoryCache();builder.Services.AddStackExchangeRedisCache(opt =>{ opt.ConfigurationOptions = new StackExchange.Redis.ConfigurationOptions { EndPoints = { "localhost:6379" }, AbortOnConnectFail = false };});builder.Services.AddHybridCache();var app = builder.Build();app.MapGet("/time0", async (IMemoryCache cache) =>{returnawait cache.GetOrCreateAsync("time0", async _ => await Task.FromResult(DateTime.Now));});app.MapGet("/time1", async (IDistributedCache cache) =>{var time = await cache.GetStringAsync("time1");if (string.IsNullOrWhiteSpace(time)) { time = DateTime.Now.ToString();await cache.SetStringAsync("time1", time); }return time;});app.MapGet("/time2", async (HybridCache cache) =>{returnawait cache.GetOrCreateAsync("time2", async _ => await Task.FromResult(DateTime.Now));});app.Run();
如上代码，如果添加了内存，和一种分布式，那么混合缓存用的是谁呢？请自行试验，可以把结果同步到本篇文章的评论里。：）
