方式一：自定义

NuGet包：

Microsoft.Extensions.DependencyModel
Microsoft.Extensions.Options

XXX.Common项目下新建文件夹【DependencyInjection】

 

新建类：RuntimeHelper、ServiceExtension

using Microsoft.Extensions.DependencyModel;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Runtime.Loader;

namespace NetFive.Common.DependencyInjection
{
    public class RuntimeHelper
    {
        /// <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 deps = DependencyContext.Default;
            var libs = deps.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)
                {
                }
            }
            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;
                }
                return false;
            });
        }
    }
}

using Microsoft.Extensions.DependencyInjection;
using System;
using System.Linq;
using System.Reflection;

namespace NetFive.Common.DependencyInjection
{
    /// <summary>
    /// IServiceCollection扩展
    /// </summary>
    public static class ServiceExtension
    {
        /// <summary>
        /// 注册服务
        /// </summary>
        /// <param name="services"></param>
        /// <param name="interfaceAssemblyName">定义业务接口的程序集名称</param>
        /// <param name="implementAssemblyName">实现业务接口的程序集名称(默认 interfaceAssemblyName)</param>
        public static void RegisterService(this IServiceCollection service, string interfaceAssemblyName, string implementAssemblyName)
        {
            if (string.IsNullOrEmpty(implementAssemblyName))
            {
                RegisterAssembly(service, interfaceAssemblyName);
            }
            else
            {
                RegisterAssembly(service, interfaceAssemblyName, implementAssemblyName);
            }
        }

        /// <summary>
        /// 批量注入接口程序集中对应的实现类。
        /// <para>
        /// 需要注意的是，这里有如下约定：
        /// IUserService --> UserService, IUserRepository --> UserRepository.
        /// </para>
        /// </summary>
        /// <param name="service"></param>
        /// <param name="interfaceAssemblyName">接口程序集的名称（不包含文件扩展名）</param>
        /// <returns></returns>
        internal static IServiceCollection RegisterAssembly(this IServiceCollection service, string interfaceAssemblyName)
        {
            if (service == null)
            { 
                throw new ArgumentNullException(nameof(service));
            }
            if (string.IsNullOrEmpty(interfaceAssemblyName))
            {
                throw new ArgumentNullException(nameof(interfaceAssemblyName));
            }
            var assembly = RuntimeHelper.GetAssembly(interfaceAssemblyName);
            if (assembly == null)
            {
                throw new DllNotFoundException($"the dll \"{interfaceAssemblyName}\" not be found");
            }
            //过滤掉非接口及泛型接口
            var types = assembly.GetTypes().Where(t => t.GetTypeInfo().IsInterface);
            foreach (var type in types)
            {
                var implementTypeName = type.Name.Substring(1);
                var implementType = RuntimeHelper.GetImplementType(implementTypeName, type);
                if (implementType != null)
                    service.AddScoped(type, implementType);
            }
            return service;
        }

        /// <summary>
        /// 用DI批量注入接口程序集中对应的实现类。
        /// </summary>
        /// <param name="service"></param>
        /// <param name="interfaceAssemblyName">接口程序集的名称（不包含文件扩展名）</param>
        /// <param name="implementAssemblyName">实现程序集的名称（不包含文件扩展名）</param>
        /// <returns></returns>
        internal static IServiceCollection RegisterAssembly(this IServiceCollection service, string interfaceAssemblyName, string implementAssemblyName)
        {
            if (service == null)
                throw new ArgumentNullException(nameof(service));
            if (string.IsNullOrEmpty(interfaceAssemblyName))
                throw new ArgumentNullException(nameof(interfaceAssemblyName));
            if (string.IsNullOrEmpty(implementAssemblyName))
                throw new ArgumentNullException(nameof(implementAssemblyName));
            var interfaceAssembly = RuntimeHelper.GetAssembly(interfaceAssemblyName);
            if (interfaceAssembly == null)
            {
                throw new DllNotFoundException($"the dll \"{interfaceAssemblyName}\" not be found");
            }
            var implementAssembly = RuntimeHelper.GetAssembly(implementAssemblyName);
            if (implementAssembly == null)
            {
                throw new DllNotFoundException($"the dll \"{implementAssemblyName}\" not be found");
            }
            //过滤掉非接口及泛型接口
            var types = interfaceAssembly.GetTypes().Where(t => t.GetTypeInfo().IsInterface);
            foreach (var type in types)
            {
                //过滤掉抽象类、泛型类以及非class
                var implementType = implementAssembly.DefinedTypes
                    .FirstOrDefault(t => t.IsClass && !t.IsAbstract &&
                                         t.GetInterfaces().Any(b => b.Name == type.Name));
                if (implementType != null)
                {
                    service.AddScoped(type, implementType.AsType());
                }
            }
            return service;
        }
    }
}

 Startup注册：

            #region IOC依赖注入自定义
            services.RegisterService("NetFive.Repository", string.Empty);
            services.RegisterService("NetFive.Command", string.Empty);
            services.RegisterService("NetFive.Query", string.Empty);
            services.RegisterService("NetFive.Service", string.Empty);
            #endregion

　　

 方式二：Autofac