Dependency injection 实现类型较少的工厂问题
举个简单的例子:Dependency injection 实现类型较少的工厂问题,dependency-injection,castle-windsor,Dependency Injection,Castle Windsor,举个简单的例子: class Program { static void Main(string[] args) { var windsorContainer = new WindsorContainer(); windsorContainer.Install(new WindsorInstaller()); var editor = windsorContainer.Resolve<IEditor>();
class Program
{
static void Main(string[] args)
{
var windsorContainer = new WindsorContainer();
windsorContainer.Install(new WindsorInstaller());
var editor = windsorContainer.Resolve<IEditor>();
editor.DoSomething();
Console.ReadKey();
}
}
public class WindsorInstaller : IWindsorInstaller
{
public void Install(IWindsorContainer container, IConfigurationStore store)
{
container.AddFacility<TypedFactoryFacility>();
container.Register(Component.For<ISomeOtherDependency>().ImplementedBy<SomeOtherDependency>());
container.Register(Component.For<IReviewingService>().ImplementedBy<ReviewingService>());
container.Register(Component.For<IEditor>().ImplementedBy<Editor>());
container.Register(Component.For<Func<IReviewingServiceFactory>>().AsFactory());
}
}
public interface IEditor
{
void DoSomething();
}
public class Editor : IEditor
{
private readonly Func<IReviewingServiceFactory> _reviewingService;
public Editor(Func<IReviewingServiceFactory> reviewingService)
{
_reviewingService = reviewingService;
}
public void DoSomething()
{
var rs = _reviewingService();
var reviews = new List<string> {"Review #1", "Review #2"};
var reviewingService = rs.Create(reviews);
reviewingService.Review();
}
}
public interface IReviewingServiceFactory
{
IReviewingService Create(IList<string> reviews);
}
public interface IReviewingService
{
void Review();
}
public class ReviewingService : IReviewingService
{
private readonly IList<string> _reviews;
private readonly ISomeOtherDependency _someOtherDependency;
public ReviewingService(IList<string> reviews, ISomeOtherDependency someOtherDependency)
{
_reviews = reviews;
_someOtherDependency = someOtherDependency;
}
public void Review()
{
Console.WriteLine("Reviewing...");
}
}
public interface ISomeOtherDependency
{
}
public class SomeOtherDependency : ISomeOtherDependency
{
}
我的Windsor安装程序有什么问题?您注册的是Func
,而不是iViewingServiceFactory
。。。试着替换
container.Register(Component.For<Func<IReviewingServiceFactory>>().AsFactory());
container.Register(Component.For().AsFactory());
与
container.Register(Component.For().AsFactory());
并相应地调整代码-然后它就应该工作了
哦,还有一件事-您注册了IReviewingService
,但没有指定默认为SINGLETON的生活方式。这很可能不是您想要的,因为只有在创建实例时,reviews
参数才会传递给实例,这只会在第一次调用工厂时发生。。。!对工厂的其他调用将返回singleton实例
因此:将
IReviewingService
的生活方式更改为瞬态,并在工厂界面上创建适当的发布方法签名(例如void Destroy(IReviewingService)
)。Ah。我的印象是,如果我的构造函数参数是Func
,那么我必须注册Func
,而不仅仅是T
。我只对我在Windsor注册的内容进行了更改,而不是构造函数参数中的Func
,因为我希望它是延迟加载的。谢谢。如果您想让编辑器插入Func
,那么可以-您需要注册Func
。但是,当您可以注入一个IReviewingServiceFactory
时,您真的没有理由通过调用Func
的额外步骤来获取工厂。这是有道理的。谢谢你更新你的答案。
container.Register(Component.For<Func<IReviewingServiceFactory>>().AsFactory());
container.Register(Component.For<IReviewingServiceFactory>().AsFactory());