如何在.net6webapi中实现自动依赖注入

    public interface ITestServices
    {
        int return123();
    }

    public class TestServices : ITestServices
    {
        public int return123()
        {
            return 123;
        }
    }

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();
builder.Services.AddTransient<ITestServices, TestServices>();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.UseHttpsRedirection();

app.UseAuthorization();

app.MapControllers();

app.Run();

    [Route("[controller]/[action]")]
    [ApiController]
    public class TestController : ControllerBase
    {
        private readonly ITestServices _testServices;
        public TestController(ITestServices testServices)
        {
            _testServices= testServices;
        }

        [HttpGet]
        public int Get123() => _testServices.return123();
    }

    //瞬时注入服务接口
    public interface ITransient
    { }

    //作用域注入服务接口
    public interface IScoped
    { }

    //单例注入服务接口
    public interface ISingleton
    { }

        public static IServiceCollection RegisterAllServices(this IServiceCollection services)
        {
            //获取当前程序集
            var entryAssembly = Assembly.GetEntryAssembly();

            //获取所有类型
            //!. null包容运算符，当你明确知道表达式的值不为null 使用!.（即null包容运算符）可以告知编译器这是预期行为，不应发出警告
            //例: entryAssembly!.GetReferencedAssemblies() 正常
            //entryAssembly.GetReferencedAssemblies() 编译器判断entryAssembly有可能为null，变量下方出现绿色波浪线警告

            var types = entryAssembly!.GetReferencedAssemblies()//获取当前程序集所引用的外部程序集
                .Select(Assembly.Load)//装载
                .Concat(new List<Assembly>() { entryAssembly })//与本程序集合并
                .SelectMany(x => x.GetTypes())//获取所有类
                .Distinct();//排重

            //三种生命周期分别注册
            Register<ITransient>(types, services.AddTransient, services.AddTransient);
            Register<IScoped>(types, services.AddScoped, services.AddScoped);
            Register<ISingleton>(types, services.AddSingleton, services.AddSingleton);

            return services;
        }

        /// <summary>
        /// 根据服务标记的生命周期interface，不同生命周期注册到容器里面
        /// </summary>
        /// <typeparam name="TLifetime">注册的生命周期</typeparam>
        /// <param name="types">集合类型</param>
        /// <param name="register">委托：成对注册</param>
        /// <param name="registerDirectly">委托：直接注册服务实现</param>
        private static void Register<TLifetime>(IEnumerable<Type> types, Func<Type, Type, IServiceCollection> register, Func<Type, IServiceCollection> registerDirectly)
        {
            //找到所有标记了Tlifetime生命周期接口的实现类
            var tImplements = types.Where(x => x.IsClass && !x.IsAbstract && x.GetInterfaces().Any(tinterface => tinterface == typeof(TLifetime)));

            //遍历，挨个以其他所有接口为key，当前实现为value注册到容器中
            foreach (var t in tImplements)
            {
                //获取除生命周期接口外的所有其他接口
                var interfaces = t.GetInterfaces().Where(x => x != typeof(TLifetime));
                if (interfaces.Any())
                {
                    foreach (var i in interfaces)
                    {
                        register(i, t);
                    }
                }

                //有时需要直接注入实现类本身
                registerDirectly(t);
            }
        }

builder.Services.RegisterAllServices();

    public interface ITestServices
    {
        int return123();
    }

    public class TestServices : ITestServices, ITransient
    {
        public int return123()
        {
            return 123;
        }
    }