不支持带有Autofac throw IServiceProvider的Ne​​t Core 3.0 [英] Net core 3.0 with Autofac throw IServiceProvider isn't supported

问题描述

我在尝试解决问题时遇到了一些麻烦，我将Autofac与.net core 3.0-6preview一起使用。
我将 new AutofacServiceProviderFactory（）添加到 CreateHostBuilder中，在此.net核心版本框架中这是必需的。
代码在2.1版及更低版本中正常运行，但现在应用程序崩溃了。

I have some trouble i try to resolve problem i use Autofac with .net core 3.0-6preview. I add new AutofacServiceProviderFactory() to CreateHostBuilder which is require in this .net core version framework. The code was working correctly in version 2.1 and lower but now application was crashed

例外：
系统。 NotSupportedException：'不支持配置服务返回System.IServiceProvider。'

The exception: System.NotSupportedException: 'ConfigureServices returning an System.IServiceProvider isn't supported.'

程序类代码：

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

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

启动类：

    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        public IContainer ApplicationContainer { get; private set; }


        // This method gets called by the runtime. Use this method to add services to the container.
        public IServiceProvider ConfigureServices(IServiceCollection services)
        {
            var builder = new ContainerBuilder();
            builder.Populate(services);
            builder.RegisterModule(new ContainerModule(Configuration));
            ApplicationContainer = builder.Build();
            return new AutofacServiceProvider(ApplicationContainer);
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env, IApplicationLifetime appLifetime)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
                app.UseHsts();
            }

            app.UseHttpsRedirection();

            app.UseRouting();

            app.UseAuthorization();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
            });


            var jwtSettings = app.ApplicationServices.GetService<JwtSettings>();
            var generalSettings = app.ApplicationServices.GetService<GeneralSettings>();
            if (generalSettings.SeedData)
            {
                var dataInitializer = app.ApplicationServices.GetService<IDataInitializer>();
                dataInitializer.SeedAsync();
            }

            //           app.UseMvc();
            appLifetime.ApplicationStopped.Register(() => ApplicationContainer.Dispose());

        }
    }

推荐答案

用于配置Autofac的启动语法已更改。

Startup syntax has changed for configuring Autofac.

相反，在启动中执行以下操作

Instead, in Startup do the following

public void ConfigureServices(IServiceCollection services) {
    //... normal registration here

    // Add services to the collection. Don't build or return
    // any IServiceProvider or the ConfigureContainer method
    // won't get called.
}

public void ConfigureContainer(ContainerBuilder builder) {
    //configure auto fac here
    builder.RegisterModule(new ContainerModule(Configuration));
}

参考适用于ASP.NET Core 3.0+的Autofac文档

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