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));
和单元测试失败：
[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);
}
它失败了,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？
解决方法
通常像这样的循环引用是Bad Idea™,而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.
