项目启动时，创建依赖注入容器
定义一静态容器 IWindsorContainer
1 private static IWindsorContainer _container;
在 Application_Start() 中，创建该容器
1 _container = new WindsorContainer();
调用 Container Install 方法，向容器内注册组件
1 _container.Install(FromAssembly.This());
该语句会调用整个程序集中所有实现了 IWindsorInstaller 接口类中的Install方法以向容器的注册组件。如下列代码：
1 public void Install(IWindsorContainer container, IConfigurationStore store)
2 {
3 container.Register(
4 Component.For<IDPlatypusRepository>().ImplementedBy<DPlatypusRepository>().LifestylePerWebRequest());
5 }
特别列出向 Container 中注册 Controler 的代码：
1 public void Install(IWindsorContainer container, IConfigurationStore store)
2 {
3 container.Register(Classes.FromThisAssembly()
4 .BasedOn<ApiController>().LifestylePerWebRequest());
5 }
定义实现 IDependencyResolver 接口的 WindsorDependencyResolver 类，作为全局 HttpConfiguration 的 Resolver
var dependencyResolver = new WindsorDependencyResolver(_container); configuration.DependencyResolver = dependencyResolver;
创建一新 IHttpControllerActivator，更改 Controller 创建方式为从容器 Container 中获取
实现 IHttpControllerActivator 接口 Create 方法
1 public IHttpController Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType)
2 {
3 var controller = (IHttpController)_container.Resolve(controllerType);
4
5 request.RegisterForDispose(
6 new Release(() => _container.Release(controller)));
7
8 return controller;
9 }
并且注册当 web request 被 Dispose 的时候，Dispose 该 Controller。
替换 Default IHttpControllerActivator 行为
GlobalConfiguration.Configuration.Services.Replace(typeof(IHttpControllerActivator), new WindsorCompositionRoot(container));
参考资料：
Simplest Possible ASP.NET Web API Project that Implements IoC/DI using Castle Windsor
http://www.codeproject.com/Articles/710662/Simplest-Possible-ASP-NET-Web-API-Project-that-Imp
WebAPI Dependency Injection
https://github.com/ucdavis/UCDArch/wiki/WebAPI-Dependency-Injection
Difference between inheriting ApiController vs. IHttpController
ASP.NET WEB API 2: HTTP MESSAGE LIFECYLE
http://www.asp.net/posters/web-api/asp.net-web-api-poster.pdf
使用 Castle Windsor 实现 Web API 依赖注入
http://beginor.github.io/2014/12/21/webapi-dependency-injection-with-castle-windsor.html