Unity 在正在解析的属性的构造函数中注入参数

Question

我找不到在这种情况下注入参数的方法：

class Top
{
    private ISome some;
    public Top()
    {
        some = CreateSome(localRuntimeVariable);
    }

    //I need to pass "some" instance as a InjectionParameter to Child constructor
    [Dependency]
    public Child Child {get;set;}
}
class Child
{
    //I need to inject ISome but it can only be constructed in Top
    public Child(ISome some, Foo foo)
    {
    }
}
public class Usage
{
    private void Top GetTop(Foo foo)
    {
        return unity.Resolve<Top>(new DependencyOverride<Foo>(foo));
        //I expect: Top.Constuctor called and 'some' is assigned;
        //          Top.Child property beeing resolved: Child.Constructor called
        //          'foo' instance to be taken from unity.Resolve<Top>(new DependencyOverride<Foo>(foo));
        //          'some' instance to be taken from Top.some, but how to tell unity to inject it?
    }
}

Answer 1

class Top
{
    public Top( Foo foo, IUnityContainer container )
    {
        some = CreateSome(localRuntimeVariable);
        Child = container.Resolve<Child>(new ParameterOverride("some" some),
            new ParameterOverride("Foo", foo));
    }

    public Child Child {get;private set;}
}

class Child
{
    public Child(ISome some, Foo foo)
    {
    }
}

现在，您可以使用 unity.Resolve(new ParameterOverride("Foo", foo)) 解析 top 的实例，

不需要 Usage 类。 GetTop(Foo foo) 只是 unity.Resolve(new DependencyOverride(foo)) 的语法糖