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，於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 pubic class UserService:IUserService,IUserRepository{}，

注冊 UserService 為 IUserService 和 IUserRepository

等效於：

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，這相當於 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，這樣注冊的好處在於容易做插件化，新的插件需要注冊什么樣的服務，外界並不知道，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

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