最近在研究Oxite，發現在這個程序中，大量采用了Unity這個微軟的IOC框架。過去我對于IOC的了解，還只停留在“城堡”階段。所以最近對Unity這個框架進行了下小小的補課，現在就將一個簡單的應用拿出來跟大家分享。

首先，我有個主頁HOME

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public class HomeController : Controller

在它下面有個Index，在這個頁面上有個主頁信息，需要從數據庫上獲取，我們首先先創建一個獲取這個信息的接口

??? public interface IGetHomeInfo
??? {
??????? string GetHomeTitle();
??? }

然后，實現它的一種方式

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??? public class GetHome : IGetHomeInfo
??? {

??????? #region IGetHomeInfo 成員

??????? public string GetHomeTitle()
??????? {
??????????? DataService ds = new DataService();
??????????? return ds.GetHomeTitle();
??????? }

??????? #endregion
??? }

然后，我們先在index頁面的Controller中，加入這個接口

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??? public class HomeController : Controller
??? {

??????? [Dependency]
??????? public IGetHomeInfo getHomeTitle { get; set; }

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??????? [LoggerFilter()]
??????? [ExceptionFilter()]
??????? public ActionResult Index(int? id)
??????? {
??????????? DataService ds = new DataService();
??????????? ViewData["HomeTitle"] = getHomeTitle.GetHomeTitle();
??????????? ViewData["Id"] = id.ToString();
??????????? return View();
??????? }

好了，現在我們在Index(int? id)中放入了一個IGetHomeInfo 類型的注入接口，下面我們就把GetHome 注入到這個位置

??? public interface IContainerAccessor
??? {
??????? IUnityContainer Container { get; }
??? }

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public class MvcApplication : System.Web.HttpApplication, IContainerAccessor

??? {
??????? private static UnityContainer _container;

??????? public static IUnityContainer Container
??????? {
??????????? get { return _container; }
??????? }

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??????? IUnityContainer IContainerAccessor.Container
??????? {
??????????? get { return Container; }
??????? }

??????? public static void RegisterRoutes(RouteCollection routes)
??????? {
??????????? routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

??????????? routes.MapRoute(
??????????????? "Default",????????????????????????????????????????????? // Route name
??????????????? "{controller}/{action}/{id}",?????????????????????????? // URL with parameters
??????????????? new { controller = "Test", action = "Index", id = "" }? // Parameter defaults
??????????? );

????????

??????? }

??????? protected void Application_Start()
??????? {
??????????? AreaRegistration.RegisterAllAreas();

??????????? RegisterRoutes(RouteTable.Routes);

??????????? if (_container == null)
??????????????? _container = new UnityContainer();

??????????? IControllerFactory controllerFactory =
??????????????? new UnityControllerFactory(_container);

??????????? ControllerBuilder.Current.SetControllerFactory(controllerFactory);

??????????? _container.RegisterType<IGetHomeInfo, GetHome>????//在這里完成了具體的接口-類型綁定
??????????????? (new ContainerControlledLifetimeManager());

　　　　_container.RegisterType<IActionInvoker, BYSJControllerActionInvoker>();
??????? }
??? }

最后，我們還需要完成UnityControllerFactory它繼承自DefaultControllerFactory，代碼如下：

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public class UnityControllerFactory : DefaultControllerFactory
??? {
??????? IUnityContainer _container;

??????? public UnityControllerFactory(IUnityContainer container)
??????? {
??????????? _container = container;
??????? }

??????? protected override IController GetControllerInstance(System.Web.Routing.RequestContext requestContext,Type controllerType)
??????? {
??????????? if (controllerType == null)
??????????????? throw new ArgumentNullException("controllerType");

??????????? if (!typeof(IController).IsAssignableFrom(controllerType))
??????????????? throw new ArgumentException(string.Format(
??????????????????? "Type requested is not a controller: {0}", controllerType.Name),
??????????????????? "controllerType");

??????????? IController ic? = _container.Resolve(controllerType) as IController;
??????????? if (typeof(Controller).IsAssignableFrom(controllerType))
??????????? {
??????????????? Controller controller = ic as Controller;

??????????????? if (controller != null)
??????????????????? controller.ActionInvoker = _container.Resolve<IActionInvoker>();

??????????????? return ic;
??????????? }

??????????? return ic;
??????? }
??? }

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這樣，一個簡單的IOC注入就完成了，至于程序中的IActionInvoker是怎么回事，我們留到下回再說

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轉載于:https://www.cnblogs.com/yriyr/archive/2010/01/31/1660638.html

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