Unity的Hierarchies

Unity的Container允许树型的层次结构，比如一个Container下可以有多个子Container，这些Container下也允许有多个子Container。示例如下：

IUnityContainer unityContainer = new UnityContainer();
IUnityContainer childUnityContainer = unityContainer.CreateChildContainer();

unityContainer.RegisterType<TextWriter, StringWriter>(new ContainerControlledLifetimeManager(), new InjectionConstructor());
childUnityContainer.RegisterType<TextWriter, StreamWriter>(new PerThreadLifetimeManager(), new InjectionConstructor(“a”));

TextWriter textWriter = unityContainer.Resolve<TextWriter>();
TextWriter textWriter2 = childUnityContainer.Resolve<TextWriter>();

值得注意的是一般情况下父Container的销毁并不影响子Container的使用。