Core: The issue of using AUTOFAC in. NET Core 3.0 Preview 5

[lichen19951127]

Bing-translator: The issue of using AUTOFAC in. NET Core 3.0 Preview 5 cannot be returned IServiceProvider

Original

Title: .net core 3.0 预览版5中使用autofac的问题

.net core 3.0 预览版5中使用autofac的问题 无法返回IServiceProvider

[karelz]

@lichen19951127 please use English, we do not scale to respond to reports in other languages. Thanks!

[karelz]

Please provide a minimal repro demonstrating the problem.
It is not clear what the problem is in the description above. Thanks!

[lichen19951127]

.net core 3.0 preview5 use autofac,ConfigureServices Unable to return IServiceProvider

[davidfowl]

In .NET Core 3.0 you can do this:

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

[lichen19951127]

.net core 3.0 preview5 use autofac, ConfigureServices Unable to return IServiceProvider in Startup class

[davidfowl]

Right, and the above code snippet is the replacement.

[lichen19951127]

I don't know how to write in Startup class

[lichen19951127]

Do you have a web example?

[davidfowl]

You do not, this is what the web example looks like in 3.0:

https://github.com/dotnet/core/issues/2828#issuecomment-500195988

Program.cs

```C#
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Autofac.Extensions.DependencyInjection;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;

namespace WebApplication277
{
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.cs**

```C#
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Autofac;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

namespace WebApplication277
{
    public class Startup
    {
        // This method gets called by the runtime. Use this method to add services to the container.
        // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
        {

        }

        public void ConfigureContainer(ContainerBuilder containerBuilder)
        {
            // wire up using autofac specific APIs here
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseRouting();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapGet("/", async context =>
                {
                    await context.Response.WriteAsync("Hello World!");
                });
            });
        }
    }
}

[lichen19951127]

Thank you,I succeeded

[davidfowl]

Great!

[lichen19951127]

How can I not see your comment, don't understand what you mean?

---

莫谈他人高薪,且看闲时谁在拼!!!

------------------ 原始邮件 ------------------
发件人: "Nenad Vićentić"[e-mail];
发送时间: 2019年9月5日(星期四) 晚上7:09
收件人: "dotnet/core"[e-mail];
抄送: "李晨"[e-mail]; "Mention"[e-mail];
主题: Re: [dotnet/core] The issue of using AUTOFAC in. NET Core 3.0 Preview5 (#2828)

@davidfowl What is correct way to use builder.Populate(services);method in this scenario? I could save private field IServiceCollection _servicesat the last line of ConfigureServicesmethod, but it feels as completely wrong approach.

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