【L·S】浅谈.Net Core Dependency 二
其实IServiceCollection本质就是IList，而且并没有发现AddScoped、AddTransient、AddSingleton踪影，说明这几个方法是扩展方法，我们找到ServiceCollectionServiceExtensions扩展类的位置,我们平时用的方法都在这里，由于代码非常多这里就不全部粘贴出来了，我们只粘贴AddTransient相关的，AddScoped、AddSingleton的实现同理Copy/// /// 通过泛型注册/// public static IServiceCollection AddTransient(this IServiceCollection services) where TService : class where TImplementation : class, TService{ if (services == null) { throw new ArgumentNullException(nameof(services)); } //得到泛型类型 return services.AddTransient(typeof(TService), typeof(TImplementation));}/// /// 根据类型注册/// public static IServiceCollection AddTransient( this IServiceCollection services, Type serviceType, Type implementationType){ if (services == null) { throw new ArgumentNullException(nameof(services)); } if (serviceType == null) { throw new ArgumentNullException(nameof(serviceType)); } if (implementationType == null) { throw new ArgumentNullException(nameof(implementationType)); } return Add(services, serviceType, implementationType, ServiceLifetime.Transient);}/// /// 根据类型实例来自工厂注册方法/// public static IServiceCollection AddTransient( this IServiceCollection services, Type serviceType, Func implementationFactory){ if (services == null) { throw new ArgumentNullException(nameof(services)); } if (serviceType == null) { throw new ArgumentNullException(nameof(serviceType)); } if (implementationFactory == null) { throw new ArgumentNullException(nameof(implementationFactory)); } return Add(services, serviceType, implementationFactory, ServiceLifetime.Transient);}通过以上代码我们可以得到两个结论，一是注册服务的方法本质都是在调用Add重载的两个方法，二是声明周期最终还是通过ServiceLifetime来控制的AddScoped、AddTransient、AddSingleton只是分文别类的进行封装而已，我们来看ServiceLifetime的源码实现http://cdn.u1.huluxia.com/g4/M03/A8/67/rBAAdl8HscqAU4QWAAKqv8KiwVM421.jpg
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