我有组件:
public interface IFoo
{ }
public interface IBar
{ }
public class Foo : IFoo
{
public IBar Bar { get; set; }
}
public class Bar : IBar
{
public IFoo Foo { get; set; }
}
我有Castle-Windsor配置:
Container.AddComponent("IFoo", typeof (IFoo), typeof (Foo));
Container.AddComponent("IBar", typeof (IBar), typeof (Bar));
单元测试失败:
[Test]
public void FooBarTest()
{
var container = ObjFactory.Container;
var foo = container.Resolve<IFoo>();
var bar = container.Resolve<IBar>();
Assert.IsNotNull(((Foo) foo).Bar);
Assert.IsNotNull(((Bar) bar).Foo);
}
失败,因为循环依赖,“foo”.Bar或“bar”.Foo为null。 如何配置Castle以正确初始化两个组件?
我可以手动正确初始化两个组件:
[Test]
public void FooBarTManualest()
{
var fooObj = new Foo();
var barObj = new Bar();
fooObj.Bar = barObj;
barObj.Foo = fooObj;
var foo = (IFoo) fooObj;
var bar = (IBar) barObj;
Assert.IsNotNull(((Foo)foo).Bar);
Assert.IsNotNull(((Bar)bar).Foo);
}
..它有效,通过。 如何使用Castle Windsor进行此类配置?
答案 0 :(得分:12)
通常像这样的循环引用是Bad Idea™,Windsor不解决它们,所以这部分你必须手动完成:
var container = new WindsorContainer();
container.Register(Component.For<IFoo>().ImplementedBy<Foo>()
.OnCreate((k, f) =>
{
var other = k.Resolve<IBar>() as Bar;
((Foo)f).Bar = other;
other.Foo = f;
}),
Component.For<IBar>().ImplementedBy<Bar>());
var foo = container.Resolve<IFoo>() as Foo;
var bar = container.Resolve<IBar>() as Bar;
Debug.Assert(bar.Foo != null);
Debug.Assert(foo.Bar != null);
Debug.Assert((foo.Bar as Bar).Foo == foo);
Debug.Assert((bar.Foo as Foo).Bar == bar);
然而,真正需要这种循环是非常罕见的。您可能想要修改您的设计。