Question

我通过Func<Owned<OwnedDependency>>注入依赖项。其中一个依赖项需要一个参数，我只能在构造OwnedDependency时使用。

public class OwnedDependency
{
    public OwnedDependency(IDependency1 dependency)
    {
    }
}

public interface IDependency1
{
}

public class Dependency1 : IDependency1
{
    public Dependency1(MyParameter parameter)
    {
    }
}

public class MyClass
{
    private readonly Func<Owned<OwnedDependency>> m_ownedDependencyFactory;

    public MyClass(Func<Owned<OwnedDependency>> ownedDependencyFactory)
    {
        m_ownedDependencyFactory = ownedDependencyFactory;
    }

    public void CreateOwnedDependency()
    {
        var parameter = new MyParameter(...);
        // ** how to setup parameter with the container? **

        using (var ownedDependency = m_ownedDependencyFactory())
        {
        }
    }
}

我无法找到一种设置MyParameter实例的简洁方法。

我探索的一种方法是将ILifetimeScope注入MyClass，然后执行以下操作：

var parameter = new MyParameter(...);

using (var newScope = m_lifetimeScope.BeginLifetimeScope())
{
    newScope.Resolve<IDependency1>(new TypedParameter(typeof(MyParameter), parameter));
    var ownedDependency = newScope.Resolve<OwnedDependency>();
    // ...
}

但容器正在变得不必要地侵入。理想情况下，我想要做的是注入Func<IDependency1, Owned<OwnedDependency>>，并且容器愿意使用传入的参数来满足任何必要的依赖关系，而不仅仅是OwnedDependency上的依赖关系。

Answer 1

如果使用IDependency1的另一个工厂分两步完成解决方案：

public class MyClass
{
    private Func<MyParameter, IDependency1> dependency1Factory;
    private Func<IDependency1, Owned<OwnedDependency>> ownedDependencyFactory;


    public MyClass(
        Func<MyParameter, IDependency1> dependency1Factory,
        Func<IDependency1, Owned<OwnedDependency>> ownedDependencyFactory)
    {
        this.dependency1Factory = dependency1Factory;
        this.ownedDependencyFactory = ownedDependencyFactory;
    }

    public void CreateOwnedDependency()
    {
        var parameter = new MyParameter();
        using (var owned = ownedDependencyFactory(dependency1Factory(parameter)))
        {
        }

    }
}

如何在Autofac中间接传递参数

1 个答案: