在ASP.NET核心3.1Web API中配置Autofac DI容器，并从控制器配置使用者服务

dotnet add package Autofac
dotnet add package Autofac.AspNetCore

using Autofac;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

namespace YourNamespace
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            // 添加其他服务
            services.AddControllers();
        }

        public void ConfigureContainer(ContainerBuilder builder)
        {
            // 注册自定义服务
            builder.RegisterType<MyService>().As<IMyService>();
        }

        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseRouting();

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

public class MyController : ControllerBase
{
    private readonly IMyService _myService;

    public MyController(IMyService myService)
    {
        _myService = myService;
    }

    [HttpGet]
    public IActionResult Get()
    {
        var result = _myService.DoSomething();
        return Ok(result);
    }
}

public interface IMyService
{
    string DoSomething();
}

public class MyService : IMyService
{
    public string DoSomething()
    {
        return "Hello from MyService!";
    }
}

using Autofac;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

namespace YourNamespace
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddControllers();
        }

        public void ConfigureContainer(ContainerBuilder builder)
        {
            builder.RegisterType<MyService>().As<IMyService>();
        }

        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseRouting();

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

    public interface IMyService
    {
        string DoSomething();
    }

    public class MyService : IMyService
    {
        public string DoSomething()
        {
            return "Hello from MyService!";
        }
    }

    [ApiController]
    [Route("[controller]")]
    public class MyController : ControllerBase
    {
        private readonly IMyService _myService;

        public MyController(IMyService myService)
        {
            _myService = myService;
        }

        [HttpGet]
        public IActionResult Get()
        {
            var result = _myService.DoSomething();
            return Ok(result);
        }
    }
}