我试图在我的MVC应用程序中实现Dependency injection
。 IoC使用Unity.Mvc3.dll
。我只是想知道Unity如何不能从其他程序集注册类型。下面的代码:Unity:无法注册来自不同程序集的类型
protected void Application_Start()
{
AreaRegistration.RegisterAllAreas();
RegisterGlobalFilters(GlobalFilters.Filters);
RegisterRoutes(RouteTable.Routes);
var container = new UnityContainer();
// ok: register type from this assembly
container.RegisterType<IMessages, Messages>();
// fail: register type from another assembly (service reference)
container.RegisterType<IPlayerService, PlayerService>();
DependencyResolver.SetResolver(new UnityDependencyResolver(container));
}
public class UnityDependencyResolver : IDependencyResolver
{
private readonly IUnityContainer _container;
public UnityDependencyResolver(IUnityContainer container)
{
this._container = container;
}
public object GetService(Type serviceType)
{
try
{
return _container.Resolve(serviceType);
}
catch (Exception ex)
{
throw ex;
}
}
public IEnumerable<object> GetServices(Type serviceType)
{
try
{
return _container.ResolveAll(serviceType);
}
catch (Exception ex)
{
throw ex;
}
}
}
使用MVC中的控制器:
[Dependency]
public IPlayerService PlayerService { get; set; }
[Dependency]
public IMessages Messages { get; set; }
public ActionResult Index()
{
PlayerMessageViewModel vm = new PlayerMessageViewModel();
vm.Messages = Messages; // success!
vm.Players = PlayerService.Get(); // fail: null reference exception :PlayerService
return View(vm);
}
PlayerService
总是空,而消息的确定。
这里是PlayerService
类
public class PlayerService : IPlayerService
{
private readonly MyDbEntities _dbContext;
public PlayerService()
{
_dbContext = new MyDbEntities();
}
public PlayerService(MyDbEntities dbContext)
{
_dbContext = dbContext;
}
public IQueryable<Player> Get()
{
return _dbContext.Players.AsQueryable();
}
}
这是完整的错误消息
分辨率依赖性的失败,类型= “System.Web.Mvc.IControllerFactory”,名字=“(没有)”。
发生异常时:解析时。
异常是:InvalidOperationException - 当前类型System.Web.Mvc.IControllerFactory是一个接口,无法构造。你是否缺少类型映射?
会这样做,谢谢 – lincx
包含什么库的InjectionConstructor属性? – lincx
http://msdn.microsoft.com/en-us/library/microsoft.practices.unity.injectionconstructorattribute(v=pandp.20).aspx –