用Autofac替换.net core 内置容器

  之前看过一个帖子,他用的.net core2.2给出两种方法,我整理到了下边,自己写了一下,发现两种写法在.net core 3.0中都不支持,然后查了一些资料在最下边整理出来3.0的写法 欢迎学习交流

1.环境: .net core 2.2  

nuget 安装:

Autofac  
Autofac.Extensions.DependencyInjection

第一种方法:

新建类:AutofacModule

using Autofac;
using IService2;
using Service2;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace WebApplication2
{
    public class AutofacModule: Module
    {
        protected override void Load(ContainerBuilder builder)
        {
            builder.RegisterType<UserInfoService>().As<IUserInfoService>();
            builder.RegisterType<TestService>().As<ITestService>();
        }
    }
}

Startup类中: 返回 IServiceProvider 

public IServiceProvider ConfigureServices(IServiceCollection services)
        {
            services.Configure<CookiePolicyOptions>(options =>
            {
                // This lambda determines whether user consent for non-essential cookies is needed for a given request.
                options.CheckConsentNeeded = context => true;
                options.MinimumSameSitePolicy = SameSiteMode.None;
            });


            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);

            // Add Autofac 第一种方式,使用AutofacModule配置文件
            var containerBuilder = new ContainerBuilder();
            containerBuilder.RegisterModule<AutofacModule>();
            containerBuilder.Populate(services);
            var container = containerBuilder.Build();
            return new AutofacServiceProvider(container);

        }

第二种方法:

 public IServiceProvider ConfigureServices(IServiceCollection services)
        {
            services.Configure<CookiePolicyOptions>(options =>
            {
                // This lambda determines whether user consent for non-essential cookies is needed for a given request.
                options.CheckConsentNeeded = context => true;
                options.MinimumSameSitePolicy = SameSiteMode.None;
            });


            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);// Add Autofac 第二种方式 自动注册该程序集下的所有接口
            var containerBuilder = new ContainerBuilder();

            //自动注册该程序集下的所有接口
            //Service2 为程序集命名空间  服务层非接口层
            //InstancePerLifetimeScope：同一个Lifetime生成的对象是同一个实例
            //SingleInstance：单例模式，每次调用，都会使用同一个实例化的对象；每次都用同一个对象；
            //InstancePerDependency：默认模式，每次调用，都会重新实例化对象；每次请求都创建一个新的对象；
            containerBuilder.RegisterAssemblyTypes(Assembly.Load("Service2")).AsImplementedInterfaces().InstancePerLifetimeScope();
            containerBuilder.Populate(services);
            var container = containerBuilder.Build();
            return new AutofacServiceProvider(container);
        }

2.环境: .net core 3.0 preview5

nuget 安装:

Autofac  
Autofac.Extensions.DependencyInjection

Program类中

public class Program
    {
        public static void Main(string[] args)
        {
            CreateHostBuilder(args).Build().Run();
        }

        public static IHostBuilder CreateHostBuilder(string[] args) => Host.CreateDefaultBuilder(args)
                     .ConfigureWebHostDefaults(webBuilder => {
                         webBuilder.UseStartup<Startup>();
                     })
                //Wire up autofac
                .UseServiceProviderFactory(new AutofacServiceProviderFactory());
    }

Startup类中

// This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.Configure<CookiePolicyOptions>(options =>
            {
                // This lambda determines whether user consent for non-essential cookies is needed for a given request.
                options.CheckConsentNeeded = context => true;
            });


            services.AddControllersWithViews()
                .AddNewtonsoftJson();
            services.AddRazorPages();
        }

        public void ConfigureContainer(ContainerBuilder containerBuilder)
        {
            //wire up using autofac specific APIs here
            containerBuilder.RegisterType<UserInfoService>().As<IUserInfoService>().InstancePerLifetimeScope();
            containerBuilder.RegisterType<TestService>().As<ITestService>().InstancePerLifetimeScope();
        }