給微軟的依賴注入框架寫一些擴展方法

Intro

現在在項目里大多都是直接使用微軟的依賴注入框架，而微軟的注入方式比較簡單，不如 AutoFac 使用起來靈活，于是想給微軟的依賴注入增加一些擴展，使得可以像AutoFac 一樣比較靈活的注冊服務

Extensions

RegisterTypeAsImplementedInterface

將類型注冊為其實現的接口，比如 pubicclassUserService:IUserService,IUserRepository{}，

注冊 UserService 為 IUserService 和 IUserRepository

等效于：

services.AddSingleton<IUserService, UserService>(); services.AddSingleton<IUserRepository, UserService>();

實現代碼：

/// <summary> /// RegisterTypeAsImplementedInterfaces /// </summary> /// <param name="services">services</param> /// <param name="type">type</param> /// <param name="serviceLifetime">service lifetime</param> /// <returns>services</returns> public static IServiceCollection RegisterTypeAsImplementedInterfaces(this IServiceCollection services, Type type, ServiceLifetime serviceLifetime = ServiceLifetime.Singleton) {if (type != null){foreach (var interfaceType in type.GetImplementedInterfaces()){services.Add(new ServiceDescriptor(interfaceType, type, serviceLifetime));}}return services; }

RegisterAssemblyTypesAsImplementedInterface

在上面的基礎上，加載指定程序集中的類型（不指定程序集則使用當前應用程序域中所有程序集），可以通過 typesFilter 來過濾要注冊的類型

使用示例：

services.RegisterAssemblyTypesAsImplementedInterface(t => !t.IsAbstract && t.IsClass && t.IsAssignableTo<IEventHandler>(), typeof(NoticeViewEventHandler).Assembly);

實現源碼：

/// <summary> /// RegisterTypeAsImplementedInterfaces /// </summary> /// <param name="services">services</param> /// <param name="assemblies">assemblies</param> /// <returns>services</returns> public static IServiceCollection RegisterAssemblyTypesAsImplementedInterfaces(this IServiceCollection services,params Assembly[] assemblies)=> RegisterAssemblyTypesAsImplementedInterfaces(services, typesFilter: null, ServiceLifetime.Singleton, assemblies); /// <summary> /// RegisterTypeAsImplementedInterfaces /// </summary> /// <param name="services">services</param> /// <param name="serviceLifetime">service lifetime</param> /// <param name="assemblies">assemblies</param> /// <returns>services</returns> public static IServiceCollection RegisterAssemblyTypesAsImplementedInterfaces(this IServiceCollection services,ServiceLifetime serviceLifetime, params Assembly[] assemblies)=> RegisterAssemblyTypesAsImplementedInterfaces(services, typesFilter: null, serviceLifetime, assemblies); /// <summary> /// RegisterTypeAsImplementedInterfaces, singleton by default /// </summary> /// <param name="services">services</param> /// <param name="typesFilter">filter types to register</param> /// <param name="assemblies">assemblies</param> /// <returns>services</returns> public static IServiceCollection RegisterAssemblyTypesAsImplementedInterfaces(this IServiceCollection services, Func<Type, bool> typesFilter, params Assembly[] assemblies)=> RegisterAssemblyTypesAsImplementedInterfaces(services, typesFilter: typesFilter, ServiceLifetime.Singleton, assemblies); /// <summary> /// RegisterTypeAsImplementedInterfaces /// </summary> /// <param name="services">services</param> /// <param name="typesFilter">filter types to register</param> /// <param name="serviceLifetime">service lifetime</param> /// <param name="assemblies">assemblies</param> /// <returns>services</returns> public static IServiceCollection RegisterAssemblyTypesAsImplementedInterfaces(this IServiceCollection services, Func<Type, bool> typesFilter, ServiceLifetime serviceLifetime, params Assembly[] assemblies) {if (assemblies == null || assemblies.Length == 0){assemblies = ReflectHelper.GetAssemblies();}var types = assemblies.Select(assembly => assembly.GetExportedTypes()).SelectMany(t => t);if (typesFilter != null){types = types.Where(typesFilter);}foreach (var type in types){foreach (var implementedInterface in type.GetImplementedInterfaces()){services.Add(new ServiceDescriptor(implementedInterface, type, serviceLifetime));}}return services; }

RegisterAssemblyTypes

注冊類型，這相當于 AutoFac 中 RegisterAssemblyTypes().AsSelf()

services.RegisterAssemblyTypes(t => !t.IsAbstract && t.IsClass && t.IsAssignableTo<IEventHandler>(), typeof(NoticeViewEventHandler).Assembly);

實現源碼：

/// <summary> /// RegisterAssemblyTypes /// </summary> /// <param name="services">services</param> /// <param name="assemblies">assemblies</param> /// <returns>services</returns> public static IServiceCollection RegisterAssemblyTypes(this IServiceCollection services, params Assembly[] assemblies)=> RegisterAssemblyTypes(services, null, ServiceLifetime.Singleton, assemblies); /// <summary> /// RegisterAssemblyTypes /// </summary> /// <param name="services">services</param> /// <param name="serviceLifetime">service lifetime</param> /// <param name="assemblies">assemblies</param> /// <returns>services</returns> public static IServiceCollection RegisterAssemblyTypes(this IServiceCollection services,ServiceLifetime serviceLifetime, params Assembly[] assemblies)=> RegisterAssemblyTypes(services, null, serviceLifetime, assemblies); /// <summary> /// RegisterAssemblyTypes /// </summary> /// <param name="services">services</param> /// <param name="typesFilter">filter types to register</param> /// <param name="assemblies">assemblies</param> /// <returns>services</returns> public static IServiceCollection RegisterAssemblyTypes(this IServiceCollection services,Func<Type, bool> typesFilter, params Assembly[] assemblies)=> RegisterAssemblyTypes(services, typesFilter, ServiceLifetime.Singleton, assemblies); /// <summary> /// RegisterAssemblyTypes /// </summary> /// <param name="services">services</param> /// <param name="typesFilter">filter types to register</param> /// <param name="serviceLifetime">service lifetime</param> /// <param name="assemblies">assemblies</param> /// <returns>services</returns> public static IServiceCollection RegisterAssemblyTypes(this IServiceCollection services, Func<Type, bool> typesFilter, ServiceLifetime serviceLifetime, params Assembly[] assemblies) {if (assemblies == null || assemblies.Length == 0){assemblies = ReflectHelper.GetAssemblies();}var types = assemblies.Select(assembly => assembly.GetExportedTypes()).SelectMany(t => t);if (typesFilter != null){types = types.Where(typesFilter);}foreach (var type in types){services.Add(new ServiceDescriptor(type, type, serviceLifetime));}return services; }

ServiceModule

在 AutoFac 中有一個 Module 的概念可以讓我們更方便的注冊，一般可以在一個 Module 里注冊需要服務注冊的服務，這樣注冊的好處在于容易做插件化，新的插件需要注冊什么樣的服務，外界并不知道，如果用 Module 的注冊方式，我只需要調用插件中的 Module 就可以注冊所需要的服務了

IServiceModule

類似于 AutoFac 中的 Module，我們也可以定義一個 IServiceModule，定義一個 ConfigueServices(IServiceCollectionservices) 的方法用來注冊服務

public interface IServiceModule {void ConfigureServices(IServiceCollection services); }

ServiceModule Demo

public class BusinessServiceModule : IServiceModule {public void ConfigureServices(IServiceCollection services){services.AddEFRepository();services.AddBLL();services.TryAddScoped<ReservationHelper>();services.TryAddSingleton<CaptchaVerifyHelper>();services.TryAddSingleton<OperLogHelper>();} }

RegisterAssemblyModules

上面我們定義了一個 Module，下面來定義一個擴展方法來注冊 module 中的服務信息

使用示例：

// load service modules services.RegisterAssemblyModules(pluginAssemblies);

實現源碼：

/// <summary> /// RegisterAssemblyModules /// </summary> /// <param name="services">services</param> /// <param name="assemblies">assemblies</param> /// <returns>services</returns> public static IServiceCollection RegisterAssemblyModules([NotNull] this IServiceCollection services, params Assembly[] assemblies) {if (assemblies == null || assemblies.Length == 0){assemblies = ReflectHelper.GetAssemblies();}foreach (var type in assemblies.SelectMany(ass => ass.GetTypes()).Where(t => t.IsClass && !t.IsAbstract && typeof(IServiceModule).IsAssignableFrom(t))){try{if (Activator.CreateInstance(type) is IServiceModule module){module.ConfigureServices(services);}}catch (Exception e){Console.WriteLine(e);}}return services; }

Reference

• https://github.com/WeihanLi/WeihanLi.Common/blob/58cec5fe93baa3ad73df6e339e2fcb609a7b4b79/src/WeihanLi.Common/Extensions/ServiceCollectionExtension.cs

• https://github.com/WeihanLi/ActivityReservation/blob/dev/ActivityReservation/Startup.cs

• https://github.com/WeihanLi/ActivityReservation/blob/dev/ActivityReservation.Helper/Services/BusinessServiceModule.cs

• https://github.com/WeihanLi/DbTool/blob/wpf-dev/DbTool/App.xaml.cs

• https://autofac.readthedocs.io/en/latest/configuration/modules.html

總結

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