I have a typed factory with a custom selector. I basically need to be able
to have a typed factory that selects the component via componentName passed
in as a method argument to the factory method. It all seems to work when I
pass a valid componentName in. However, when I pass an invalid
componentName in things go afoul. Specifically, castle somehow manages to
match another component that has the correct type but wrong name. How do
you force castle to return null or throw an error in this situation? Here
is my code:
IWindsorContainer container = new WindsorContainer();
//must register typed factory facility otherwise we get errors
container.AddFacility<TypedFactoryFacility>();
container.Register(
Component.For<IFoo>().ImplementedBy<Foo1>().Named("Foo1").LifeStyle.Transient,
Component.For<IFoo>().ImplementedBy<Foo2>().Named("Foo2").LifeStyle.Transient,
Component.For<IFooFactoryWithArgs>().AsFactory(c =>
c.SelectedWith("MySelector")),
Component.For<ITypedFactoryComponentSelector>().ImplementedBy<SelectorByComponentName>().Named("MySelector")
);
IFooFactoryWithArgs factory =
container.Resolve<IFooFactoryWithArgs>();
IFoo foo = factory.GetFoo("Foo3"); //Note, there is no
component registered with Foo3 so I would expect NULL to be returned or an
error thrown at this point. Unfortunately, Foo1 is returned.
Assert.IsNotNull(foo);
Assert.IsTrue(foo.GetType() == typeof(Foo2));
public class SelectorByComponentName : DefaultTypedFactoryComponentSelector
{
protected override string GetComponentName(MethodInfo method,
object[] arguments)
{
bool found = false;
int position = -1;
object componentArgument = null;
string componentName = null;
ParameterInfo[] pInfos = method.GetParameters();
if (pInfos != null)
{
foreach (ParameterInfo pInfo in pInfos)
{
if (pInfo.Name.ToLower() == "componentname")
{
found = true;
position = pInfo.Position;
break;
}
}
}
if (!found)
{
throw new ApplicationException("The current component
selctor did not find a 'componentname' argument for the current factory
method.");
}
componentArgument = arguments[position];
if (componentArgument == null)
{
throw new ApplicationException("The current component
selctor found a null 'componentname' argument for the current factory
method.");
}
componentName = componentArgument.ToString(); //no way to
validate that we have a valid / registered component name
if (String.IsNullOrEmpty(componentName))
{
throw new ApplicationException("The current component
selctor found a null or empty 'componentname' argument for the current
factory method.");
}
return componentName;
}
protected override IDictionary GetArguments(MethodInfo method,
object[] arguments)
{
var argumentMap = new Arguments();
return argumentMap; //No additional arguments
}
}
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