The following code passes as-is with Castle.Windsor 2.5.3 but fails after
upgrading to 3.1.0
The exception is an InvalidProxyConstructorArgumentsException and it states
"Can not instantiate proxy of class: Test. Could not find a parameterless
constructor."
static void Main(string[] args)
{
var container = new WindsorContainer();
container.Register(Component.For<Interceptor>(),
Component.For<Test>().UsingFactoryMethod(()
=> new Test(""))
.Interceptors<Interceptor>());
var test = container.Resolve<Test>(); //THROWS IN 3.1.0
}
}
public class Test
{
public readonly string S;
public Test(string s)
{
S = s;
}
}
public class Interceptor : IInterceptor
{
public void Intercept(IInvocation invocation)
{
invocation.Proceed();
}
}
In my real code Test is a MongoDatabase that is being constructed using a
factory method and injected into a Repository.
In my real code I'm also using an inheritor to an AbstractFacility to
register the interceptor. This way I don't have to register the interceptor
for each component. Both forms of interceptor usage seem to work/fail (in
2.5.3/3.1.0) the same way on later resolution. For reference here is a
shortened version of the facility:
public class Facility : AbstractFacility
{
protected override void Init() { Kernel.ComponentRegistered +=
KernelComponentRegistered; }
static void KernelComponentRegistered(string key, IHandler handler)
{
if
(typeof(IInterceptor).IsAssignableFrom(handler.ComponentModel.Implementation))
return;
handler.ComponentModel.Interceptors.AddIfNotInCollection(InterceptorReference.ForKey("SomeInterceptor"));
}
}
I looked at the Castle.Windsor source code and the throwing code is
expecting to wrap a proxy around the class it is given which is why it's
looking for a parameterless constructor. However in 2.5.3 I think the
proxy generation code never got executed and the container resolves
(correctly in my mind) to a non-proxy version of Test/MongoDatabase
So two questions I guess:
1) What's changed?
2) How do I keep my interceptor registration without generating a proxy for
the object resolved by the factory method? Or I guess how does a proxy get
generated using a factory method for the component...
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