1.Container.Resolve(Type t)
Resolve an instance of the default requested type from the container.
會將所指定的 class 產生一個 instance 並且將 Constructor 中的 parameter 注入
container.Resolve(typeof(HomeController))
public HomeController(Service service, Service2 service2)
{ this.service = service;
this.service2 = service2;
}
container 會將 Service 及 Service2 注入到 HomeController 中
但有個地方值得注意的。就是如果 HomeController 的 Constructor parameter 的 type 是 interface 時，就必需要注冊
container.RegisterType<IService, Service>();
否則會有錯誤產生
2. Singleton
底下以 RegisterInstance 的方來來注冊 IUser
protected void Application_Start()
{ IUnityContainer container = new UnityContainer();
container.RegisterInstance<IUser>(new User() { Name = "Unity" });
CustomUnityControllerFactory factory = new CustomUnityControllerFactory(container);
ControllerBuilder.Current.SetControllerFactory(factory);
RegisterRoutes(RouteTable.Routes);
}
HomeController
Constructor 中有兩個參數 Service1, Service2
[HandleError]
public class HomeController : Controller
{ Service1 service1;
Service2 service2;
public HomeController(Service1 service1, Service2 service2)
{ this.service1 = service1;
this.service2 = service2;
}
public ActionResult Index()
{ ViewData["Message"] = service1.Message();
ViewData["Message2"] = service2.Message();
return View();
}
public ActionResult About()
{ return View();
}
}
Service1
在呼叫 Message 後會改變 User.Name 的值
public class Service1 : IService
{ IUser user;
public Service1(IUser user)
{ this.user = user;
}
#region IService Members
public string Message()
{ string t = user.Name;
user.Name = "Yes!! I'm Sigleton";
return t;
}
#endregion
}
Service2
public class Service2 : IService
{ IUser user;
public Service2(IUser user)
{ this.user = user;
}
#region IService Members
public string Message()
{ return user.Name;
}
#endregion
}
需注意的是 在 Service 的 constructor 中需以 IUser ，如以Class 來當為參數的話。unity會產生一個新的實體。
Reference
Unity framework with ASP.Net MVC Framework
