ASP.NET Web API - 使用 Castle Windsor 依赖注入

示例代码

项目启动时，创建依赖注入容器

定义一静态容器 IWindsorContainer

private static IWindsorContainer _container;

在 Application_Start() 中，创建该容器

_container = new WindsorContainer();

调用 Container Install 方法，向容器内注册组件

_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：

 public void Install(IWindsorContainer container, IConfigurationStore store)
 {
     container.Register(
         Component.For<IDPlatypusRepository>().ImplementedBy<DPlatypusRepository>().LifestylePerWebRequest());
 }

特别列出向 Container 中注册 Controler 的代码：

 public void Install(IWindsorContainer container, IConfigurationStore store)
 {
       container.Register(Classes.FromThisAssembly()
              .BasedOn<ApiController>().LifestylePerWebRequest());
 }

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

 public IHttpController Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType)
 {
     var controller = (IHttpController)_container.Resolve(controllerType);

     request.RegisterForDispose(
         new Release(() => _container.Release(controller)));

     return controller;
 }

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

http://stackoverflow.com/questions/21464909/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