ASP.NET CORE 学习之原生DI实现批量注册

以前使用Autofac的时候，只需一句AsImplementInterfaces()就可以很轻松实现批量注册功能。而asp.net core内置的DI框架没有现成的批量注册方法，考虑到替换Autofac框架过程有些繁琐，于是自己写扩展实现了一个简易的原生DI批量注册功能

Startup.cs扩展

public static class StartUpExtenions
    {
        /// <summary>
        /// 批量注册服务
        /// </summary>
        /// <param name="services">DI服务</param>
        /// <param name="assemblys">需要批量注册的程序集集合</param>
        /// <param name="baseType">基础类/接口</param>
        /// <param name="serviceLifetime">服务生命周期</param>
        /// <returns></returns>
        public static IServiceCollection BatchRegisterService(this IServiceCollection services, Assembly[] assemblys, Type baseType, ServiceLifetime serviceLifetime = ServiceLifetime.Singleton)
        {
            List<Type> typeList = new List<Type>();  //所有符合注册条件的类集合
            foreach (var assembly in assemblys)
            {
                //筛选当前程序集下符合条件的类
                var types = assembly.GetTypes().Where(t => !t.IsInterface && !t.IsSealed && !t.IsAbstract && baseType.IsAssignableFrom(t));
                if (types != null && types.Count() > 0)
                    typeList.AddRange(types);
            }
            if (typeList.Count() == 0)
                return services;

            var typeDic = new Dictionary<Type, Type[]>(); //待注册集合
            foreach (var type in typeList)
            {
                var interfaces = type.GetInterfaces();   //获取接口
                typeDic.Add(type, interfaces);
            }
            if (typeDic.Keys.Count() > 0)
            {
                foreach (var instanceType in typeDic.Keys)
                {
                    foreach (var interfaceType in typeDic[instanceType])
                    {
                        //根据指定的生命周期进行注册
                        switch (serviceLifetime)
                        {
                            case ServiceLifetime.Scoped:
                                services.AddScoped(interfaceType, instanceType);
                                break;
                            case ServiceLifetime.Singleton:
                                services.AddSingleton(interfaceType, instanceType);
                                break;
                            case ServiceLifetime.Transient:
                                services.AddTransient(interfaceType, instanceType);
                                break;
                        }
                    }
                }
            }
            return services;
        }
    }