与需要参数的工厂方法统一 [英] Unity with factory method who need parameters

问题描述

我想用需要参数的工厂方法在Unity容器中注册一个类型.这些参数应统一解决，但只能在运行时解决.

I want to register a type in an Unity container with a factory method who needs paramters. These parameters are to be resolved by unity but only at runtime.

工厂方法代码:

public static IApp Create(IOne, ITwo) {...}

注册代码:

container.RegisterType(typeof(IApp), new InjectionFactory(f => App.Create(???, ???)));

我需要替换"???"吗? ?

What do I need to replace the '???' ?

更多信息:

我的Unity配置分为两个阶段.第一阶段(应用程序正在启动)，我注册了除一个对象之外的所有对象:

My Unity configuration is made in two phases. First phase (application is starting), I register all my object but one :

container.RegisterType<IOne, One>();
container.RegisterType<ITwo, Two>();
container.RegisterType<IApp, App>();
// ...

第二阶段(用户正在登录)，我只注册一个上下文对象的实例，该实例在我所有类(One，Two，App，...)的构造函数中使用:

Phase two (user is logging), I juste register an instance of a context object who is used in constructor of all my classes (One, Two, App, ...) :

var childContainer = container.CreateChildContainer();
childContainer.RegisterInstance<AppEnvironment>(new AppEnvironment(userName));

这是我的代码，不使用InjectionFactory.它工作正常.现在，我必须多次注册IApp接口，并每次都调用一个不同的静态方法.静态方法示例:

This is my code without using InjectionFactory. It works fine. Now, I have to register multiple times my IApp interface, with calling a different static method each time. Example of static method :

public static IApp Create(IOne one, ITwo two, AppEnvironment env) 
{
    _one = one;
    _two = two;
    _env = env;
}

如果我向IApp注册此代码，则该代码:

If I register IApp this this code :

container.Register(typeof(IApp), new InjectionFactory(f => App.Create(container.Resolve<IOne>(), container.Resolve<ITwo>(), container.Resolve<AppEnvironment>()));

然后未设置我的env变量.

Then my env variable is not set.

但是，如果我注册了我的env实例(仅出于测试目的，我不能这样做)，

But if I register my env instance (just for test purpose, I can't do that in my case), it works.

推荐答案

最后得到了解决方案.看起来像威利斯一世:

Finally got the solution. It looks like willys one :

container.RegisterType<IApp, App>(
    new InjectionFactory(
        f => App.Create(
            f.Resolve<IOne>(), 
            f.Resolve<ITwo>()
        )
    )
);

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