实现方法

• 通过继承xx接口实现单例(singleton)，作用域（scoped），瞬时（transient）三种方式注入
• 实现ConfigService方法进行自定义注入
• 通过反射加载程序集获取继承接口的类

1. 定义被继承的接口

public interface IServiceRegistrar
{
    /// <summary>
    ///     配置注册
    /// </summary>
    /// <param name="service">服务</param>
    void ConfigService(IServiceCollection service);
}

/// <summary>
///     Scoped方式注入
/// </summary>
public interface IScoped
{
}

/// <summary>
///     Singleton方式注入
/// </summary>
public interface ISingleton
{
}

/// <summary>
///     Transient方式注入
/// </summary>
public interface ITransient
{
}

2. 定义扩展方法进行自动注册，其中RuntimeUtils.GetAllAssemblies()是自己写的获取所有程序集的方法，排除了nuget和microsoft程序集和system程序集，核心注册方法

    /// <summary>
    ///     注册系统服务，使用继承注册器<see cref="IServiceRegistrar" />或<see cref="IScoped" />或<see cref="ITransient" />或
    ///     <see cref="ISingleton" />
    /// </summary>
    /// <param name="service"></param>
    public static void AddHServices(this IServiceCollection service)
    {
        var aseArray = RuntimeUtils.GetAllAssemblies();
        var t1 = typeof(IServiceRegistrar);
        var t2 = typeof(IScoped);
        var t3 = typeof(ITransient);
        var t4 = typeof(ISingleton);
        var typeList = new List<Type>
        {
            t1, t2, t3, t4
        };
        foreach (var ase in aseArray)
        {
            var list = (from type in ase.GetTypes()
                where typeList.Any(t => t.IsAssignableFrom(type)) && !type.IsAbstract && type.IsClass
                select type).ToList();
            list.ForEach(x =>
            {
                if (x.IsInterface) return;
                if (x.IsAssignableTo(t1))
                {
                    var obj = Activator.CreateInstance(x);
                    x.GetMethod("ConfigService")!.Invoke(obj, new object?[] { service });
                }
                else
                {
                    var implTypes = x.GetInterfaces().Where(x1 => !typeList.Contains(x1));
                    foreach (var implType in implTypes)
                    {
                        if (x.IsAssignableTo(t2))
                            service.AddScoped(implType, x);
                        if (x.IsAssignableTo(t3))
                            service.AddTransient(implType, x);
                        if (x.IsAssignableTo(t4))
                            service.AddSingleton(implType, x);
                    }
                }
            });
        }
    }

3. 在program.cs添加

builder.Services.AddHServices();

4. RuntimeUtils代码，需要引入nugetMicrosoft.Extensions.DependencyModel

public static class RuntimeUtils
{
    /// <summary>
    ///     获取项目程序集，排除所有的系统程序集(Microsoft.***、System.***等)、Nuget下载包
    /// </summary>
    /// <returns></returns>
    public static IList<Assembly> GetAllAssemblies()
    {
        var list = new List<Assembly>();
        var dependencyContext = DependencyContext.Default;
        if (dependencyContext == null) return list;
        var libs = dependencyContext.CompileLibraries.Where(lib =>
            !lib.Serviceable && lib.Type != "package"); //排除所有的系统程序集、Nuget下载包
        foreach (var lib in libs)
            try
            {
                var assembly = AssemblyLoadContext.Default.LoadFromAssemblyName(new AssemblyName(lib.Name));
                list.Add(assembly);
            }
            catch (Exception)
            {
                // ignored
            }

        return list;
    }

    public static Assembly GetAssembly(string assemblyName)
    {
        return GetAllAssemblies().FirstOrDefault(assembly => assembly.FullName.Contains(assemblyName));
    }

    public static IList<Type> GetAllTypes()
    {
        var list = new List<Type>();
        foreach (var assembly in GetAllAssemblies())
        {
            var typeInfos = assembly.DefinedTypes;
            foreach (var typeInfo in typeInfos) list.Add(typeInfo.AsType());
        }

        return list;
    }

    public static IList<Type> GetTypesByAssembly(string assemblyName)
    {
        var list = new List<Type>();
        var assembly = AssemblyLoadContext.Default.LoadFromAssemblyName(new AssemblyName(assemblyName));
        var typeInfos = assembly.DefinedTypes;
        foreach (var typeInfo in typeInfos) list.Add(typeInfo.AsType());
        return list;
    }

    public static Type GetImplementType(string typeName, Type baseInterfaceType)
    {
        return GetAllTypes().FirstOrDefault(t =>
        {
            if (t.Name == typeName &&
                t.GetTypeInfo().GetInterfaces().Any(b => b.Name == baseInterfaceType.Name))
            {
                var typeInfo = t.GetTypeInfo();
                return typeInfo.IsClass && !typeInfo.IsAbstract && !typeInfo.IsGenericType;
            }

            return false;
        });
    }
}