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为ASP.NET MVC创建一个基于Unity的ControllerFactory

2011-12-13

谈到IoC和ASP.NET的集成,很多人会先后想到Ninject,不过我们个人还是倾向于Unity。这篇文章简单地介绍如果创建基于Unity的ControllerFactory。如下面的代码所示,我们通过直接继承DefaultControllerFactory创建...

谈到IoC和ASP.NET的集成,很多人会先后想到Ninject,不过我们个人还是倾向于Unity。这篇文章简单地介绍如果创建基于Unity的ControllerFactory。如下面的代码所示,我们通过直接继承DefaultControllerFactory创建一个自定的UnityControllerFactory。构造函数指定的是配置的UnityContainer的名称,如果没有显式指定则采用默认的UnityContainer。在重写的GetControllerInstance方法中,直接调用IUnityContainer的Resolve方法根据Controller类型创建相应的对象。[源代码从这里下载]

1: public class UnityControllerFactory: DefaultControllerFactory

2: {

3: public IUnityContainer Container { get; private set; }

4: public UnityControllerFactory(string containerName = "")

5: {

6: IUnityContainer container = new UnityContainer();

7: UnityConfigurationSection configSection = ConfigurationManager.GetSection(UnityConfigurationSection.SectionName) as UnityConfigurationSection;

8: if (null == configSection && !string.IsNullOrEmpty(containerName))

9: {

10: throw new ConfigurationErrorsException("Cannot find <unity> configuration section");

11: }

12:

13: if (string.IsNullOrEmpty(containerName))

14: {

15: configSection.Configure(container);

16: }

17: else

18: {

19: configSection.Configure(container, containerName);

20: }

21: this.Container = container;

22: }

23: protected override IController GetControllerInstance(RequestContext requestContext, Type controllerType)

24: {

25: Guard.ArgumentNotNull(controllerType, "controllerType");

26: return (IController)this.Container.Resolve(controllerType);

27: }

28: }

为了演示DefaultControllerFactory的作用,我们来创建一个简单的例子。假设我们要创建一个维护联系人的应用,我们通过具有如下定义的Contact类型表示联系人,而IContactRepository接口定义了一个从存储中获取所有联系人的GetAllContacts方法,DefaultContactRepository是对IContactRepository接口的实现。

1: public class Contact

2: {

3: public string Name { get; set; }

4: public string Gender { get; set; }

5: public string Address { get; set; }

6: }

7:

8: public interface IContactRepository

9: {

10: IEnumerable<Contact> GetAllContacts();

11: }

12:

13: public class DefaultContactRepository : IContactRepository

14: {

15: public IEnumerable<Contact> GetAllContacts()

16: {

17: yield return new Contact

18: {

19: Name = "Zhang San",

20: Gender = "Male",

21: Address = "#328, XingHu Street, Su Zhou, Jiang Su Province, PRC."

22: };

23:

24: yield return new Contact

25: {

26: Name = "Li Si",

27: Gender = "Female",

28: Address = "#328, Jin Ji Hu Road, Su Zhou, Jiang Su Province, PRC."

29: };

30: }

31: }

我们在Web应用的主页显示联系人列表,为此我创建了如下一个HomeController。在这里我们演示的是构造器注入,所以我们通过构造函数指定的IContactRepository对象来初始化Repository属性。在Action方法Index中调用IContactRepository的GetAllContacts方法为对应的View指定Model。

1: public class HomeController : Controller

2: {

3: public IContactRepository Repository { get; private set; }

4: public HomeController(IContactRepository repository)

5: {

6: this.Repository = repository;

7: }

8: public ActionResult Index()

9: {

10: return View(this.Repository.GetAllContacts());

11: }

12: }

Index.cshtml代码如下所示,这是一个Model类型为IEnumerable<Contact>的View,它将所有的联系人信息列出来。

1: @model IEnumerable<Artech.Web.Mvc.Extensions.Contact>

2: @{

3: ViewBag.Title = "Index";

4: }

5:

6: <h2>Contact List</h2>

7:

8: <div>

9: <ul>

10: @foreach (var contact in this.Model)

11: {

12: <li>

13: <h3>@contact.Name</h3>

14: <p>Gender: @contact.Gender</p>

15: <p>Address: @contact.Address</p>

16: <hr />

17: </li>

18: }

19: </ul>

20: </div>

自定义的UnityContainerFactory的注册定义在Gloable.asax中。初次之外,额外需要做的是忽略掉针对favicon.ico的路由,否则程序运行将会失败。

1: public class MvcApplication : System.Web.HttpApplication

2: {

3: public static void RegisterGlobalFilters(GlobalFilterCollection filters)

4: {

5: filters.Add(new HandleErrorAttribute());

6: }

7:

8: public static void RegisterRoutes(RouteCollection routes)

9: {

10: routes.IgnoreRoute("favicon.ico");

11: routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

12: routes.MapRoute("Default", "{controller}/{action}/{id}",

13: new { controller = "Home", action = "Index", id = UrlParameter.Optional }

14: );

15: }

16:

17: protected void Application_Start()

18: {

19: AreaRegistration.RegisterAllAreas();

20: RegisterGlobalFilters(GlobalFilters.Filters);

21: RegisterRoutes(RouteTable.Routes);

22:

23: ControllerBuilder.Current.SetControllerFactory(new UnityControllerFactory());

24: }

25: }

接口IContactRepository和DefualtContactRepository之间的映射关系定义在如下所示的<unity>配置中。

1: <unity>

2: <alias alias="IContactRepository" type="Artech.Web.Mvc.Extensions.IContactRepository, UnityIntegration" />

3: <alias alias="DefaultContactRepository" type="Artech.Web.Mvc.Extensions.DefaultContactRepository, UnityIntegration" />

4: <container>

5: <register type="IContactRepository" mapTo="DefaultContactRepository"/>

6: </container>

7: </unity>

通过浏览器访问Web应用的主页,将会得到如下所示的联系人列表。

image

作者:Artech

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