我对代表工厂有疑问:autofac docs
我理解他们如何建立工厂,但我没有得到解决部分:
var shareholdingFactory = container.Resolve<Shareholding.Factory>();
var shareholding = shareholdingFactory.Invoke("ABC", 1234);
看起来你必须绕过容器才能解决。也许我必须使用我在运行时才知道的参数来调用。如何在不将容器传递给服务方法的情况下执行此操作?
更新
所以你应该通过工厂呢?
答案 0 :(得分:4)
Autofac可以自动解析工厂,即没有容器:
public class ShareHolding
{
public ShareHolding(int accountId)
{
// do whatever you want
}
}
public class MyApp
{
private readonly ShareHolding _shareHolding;
public MyApp(Func<int, ShareHolding> shareHoldingFactory)
{
_shareHolding = shareHoldingFactory(99);
}
public void Run()
{
// do whatever you want with the _shareHolding object
}
}
Autofac注册
var containerBuilder = new ContainerBuilder();
containerBuilder.RegisterType<ShareHolding>(); // not a singleton
containerBuilder.RegisterType<MyApp>().SingeInstance();
var myApp = containerBuilder.Resolve<MyApp>();
myApp.Run();
现在,如果你的ShareHolding类型有ctor:
public class ShareHolding
{
public delegate ShareHolding Factory(int accountId, int userId);
public ShareHolding(int accountId, int userId)
{
// do whatever you want
}
}
然后您需要一个委托工厂,因为Autofac使用类型信息解析构造函数并使用参数名称委托工厂。您的使用将变为:
public class MyApp
{
public MyApp(ShareHolding.Factory shareHoldingFactory)
{
....
}
}