給微軟的依賴注入框架寫一些擴充套件方法
阿新 • • 發佈：2020-02-25
給微軟的依賴注入框架寫一些擴充套件方法
Intro
現在在專案裡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，於是想給微軟的依賴注入增加一些擴充套件，使得可以像AutoFac 一樣比較靈活的註冊服務
Extensions
RegisterTypeAsImplementedInterface
將型別註冊為其實現的介面，比如 pubic class UserService:IUserService,IUserRepository{}，
註冊 UserService 為 IUserService 和 IUserRepository
等效於：
services.AddSingleton<IUserService, UserService>(); services.AddSingleton<IUserRepository, UserService>();
實現程式碼：
/// <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，載入指定程式集中的型別（不指定程式集則使用當前應用程式域中所有程式集），可以通過 typesFilter 來過濾要註冊的型別
使用示例：
services.RegisterAssemblyTypesAsImplementedInterface(t => !t.IsAbstract && t.IsClass && t.IsAssignableTo<IEventHandler>(), typeof(NoticeViewEventHandler).Assembly);
實現原始碼：
/// <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
註冊型別，這相當於 AutoFac 中 RegisterAssemblyTypes().AsSelf()
services.RegisterAssemblyTypes(t => !t.IsAbstract && t.IsClass && t.IsAssignableTo<IEventHandler>(), typeof(NoticeViewEventHandler).Assembly);實現原始碼：
/// <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註冊，一般可以在一個 Module 裡註冊需要服務註冊的服務，這樣註冊的好處在於容易做外掛化，新的外掛需要註冊什麼樣的服務，外界並不知道，如果用 Module 的註冊方式，我只需要呼叫外掛中的 Module 就可以註冊所需要的服務了
IServiceModule
類似於 AutoFac 中的 Module，我們也可以定義一個 IServiceModule，定義一個 ConfigueServices(IServiceCollection services) 的方法用來註冊服務
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，下面來定義一個擴充套件方法來註冊 module 中的服務資訊
使用示例：
// load service modules
services.RegisterAssemblyModules(pluginAssemblies);實現原始碼：
/// <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