net core Autofac 替换默认的服务容器 DI，微软自动的容器不支持命名选项的

微软默认的容器，不支持命名选项，同一接口，多个实现。就不支持了。
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配置core 支持Autofac 容器

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using Autofac;
using Autofac.Extensions.DependencyInjection;namespace WebApplication13
{public interface IMyService{string GetData();}public class MyService : IMyService{public string GetData(){return "Data from MyService---MyService";}}public class MyService2 : IMyService{public string GetData(){return "2222 from MyService---MyService2";}}public class MyApplicationModule : Module{protected override void Load(ContainerBuilder builder){builder.RegisterType<MyService>().As<IMyService>();}}public class Program{public static void Main(string[] args){var builder = WebApplication.CreateBuilder(args);// 在这里添加内置DI容器的服务配置// 例如，builder.Services.AddRazorPages();// 使用Autofac作为服务提供商builder.Host.UseServiceProviderFactory(new AutofacServiceProviderFactory()).ConfigureContainer<ContainerBuilder>(containerBuilder =>{// 在这里向Autofac容器注册服务  此处使用模块方式注入containerBuilder.RegisterModule<MyApplicationModule>();}); Add services to the container.//builder.Services.AddRazorPages();var app = builder.Build();// Configure the HTTP request pipeline.if (!app.Environment.IsDevelopment()){app.UseExceptionHandler("/Error");}app.UseStaticFiles();app.UseRouting();app.UseAuthorization();app.MapRazorPages();app.Run();}}
}

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autofac 支持命名、key

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using Autofac;
using Autofac.Extensions.DependencyInjection;namespace WebApplication13
{public interface IMyService{string GetData();}public class MyService : IMyService{public string GetData(){return "Data from MyService---MyService";}}public class MyService2 : IMyService{public string GetData(){return "2222 from MyService---MyService2";}}public class MyApplicationModule : Module{protected override void Load(ContainerBuilder builder){builder.RegisterType<MyService>().As<IMyService>();builder.RegisterType<MyService>().As<IMyService>().Named<IMyService>(typeof(MyService).Name);//builder.RegisterType<MyService>().As<IMyService>().Keyed<IMyService>(typeof(MyService).Name);builder.RegisterType<MyService2>().As<IMyService>().Named<IMyService>(nameof(MyService2));}}public class Program{public static void Main(string[] args){var builder = WebApplication.CreateBuilder(args);// 在这里添加内置DI容器的服务配置// 例如，builder.Services.AddRazorPages();// 使用Autofac作为服务提供商builder.Host.UseServiceProviderFactory(new AutofacServiceProviderFactory()).ConfigureContainer<ContainerBuilder>(containerBuilder =>{// 在这里向Autofac容器注册服务  此处使用模块方式注入containerBuilder.RegisterModule<MyApplicationModule>();}); Add services to the container.//builder.Services.AddRazorPages();var app = builder.Build();// Configure the HTTP request pipeline.if (!app.Environment.IsDevelopment()){app.UseExceptionHandler("/Error");}app.UseStaticFiles();app.UseRouting();app.UseAuthorization();app.MapRazorPages();app.Run();}}
}