给微软的依赖注入框架写一些扩展方法

Intro

现在在项目里大多都是直接使用微软的依赖注入框架，而微软的注入方式比较简单，不如 AutoFac 使用起来灵活，于是想给微软的依赖注入增加一些扩展，使得可以像AutoFac 一样比较灵活的注册服务

Extensions

RegisterTypeAsImplementedInterface

将类型注册为其实现的接口，比如 pubic class UserService:IUserService,IUserRepository{}，

注册 UserService 为 IUserService 和 IUserRepository

等效于：

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

实现代码：

/// <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

在上面的基础上，加载指定程序集中的类型（不指定程序集则使用当前应用程序域中所有程序集），可以通过 typesFilter 来过滤要注册的类型

使用示例：

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

实现源码：

/// <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,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,typesFilter: typesFilter,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,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,serviceLifetime));
        }
    }

    return services;
}

RegisterAssemblyTypes

注册类型，这相当于 AutoFac 中 RegisterAssemblyTypes().AsSelf()

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

实现源码：

/// <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,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,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,typesFilter,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,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,serviceLifetime));
    }

    return services;
}

ServiceModule

在 AutoFac 中有一个 Module 的概念可以让我们更方便的注册，一般可以在一个 Module 里注册需要服务注册的服务，这样注册的好处在于容易做插件化，新的插件需要注册什么样的服务，外界并不知道，如果用 Module 的注册方式，我只需要调用插件中的 Module 就可以注册所需要的服务了

IServiceModule

类似于 AutoFac 中的 Module，我们也可以定义一个 IServiceModule，定义一个 ConfigueServices(IServiceCollection services) 的方法用来注册服务

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

上面我们定义了一个 Module，下面来定义一个扩展方法来注册 module 中的服务信息

使用示例：

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

实现源码：

/// <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

（编辑：李大同）

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