正在尝试使用Unity注入View，可是遇到了一点疑惑，如下：
在Application_Start中有如下代码：
- C# code
var container = new UnityContainer();container.RegisterInstance<IMessageService>(new MessageService { Message = "You are welcome to our Web Camps Training Kit!", }); container.RegisterType<IViewPageActivator, IndexViewPageActivator>(new InjectionConstructor(container)); //注册类型并提供了构造函数所需的参数 IDependencyResolver resolver = DependencyResolver.Current; IDependencyResolver newResolver = new UnityDependencyResolver(container, resolver); DependencyResolver.SetResolver(newResolver);相应的IndexViewPageActivator类代码如下：
- C# code
public class IndexViewPageActivator : IViewPageActivator { IUnityContainer _container; public IndexViewPageActivator(IUnityContainer container) { _container = container; } public object Create(ControllerContext controllerContext, Type type) { var o = _container.Resolve(type); return o; } }相应的UnityDependencyResolver类代码如下：
- C# code
public class UnityDependencyResolver : IDependencyResolver { IUnityContainer container; IDependencyResolver resolver; public UnityDependencyResolver(IUnityContainer container, IDependencyResolver resolver) { this.container = container; this.resolver = resolver; } public object GetService(Type serviceType) { try { return this.container.Resolve(serviceType); } catch { return this.resolver.GetService(serviceType); } } public IEnumerable<object> GetServices(Type serviceType) { try { return this.container.ResolveAll(serviceType); } catch { return this.resolver.GetServices(serviceType); } } }我不明白的是，在UnityDependencyResolver和IndexViewPageActivator中，相应的调用_container.Resolve都能返回实例，特别是在UnityDependencyResolver中，基本上不走return this.resolver.GetService(serviceType);这行代码，而我并没有操作过_container，难道MVC在某个地方向_container中注册过什么？或者是UnityContainer自己通过上下文自己注册或者进行了解析吗？
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