Re: Resolve throws error

[Krzysztof Koźmic]

Which version are you using?

On 15/06/2011 5:32 PM, PaulBowman wrote:

Hi All.

Can anybody explain why Windsor will not resolve the component.


using System;
using System.Collections.Generic;
using Castle.Windsor;
using Castle.MicroKernel.Registration;
namespace WindsorIOCProblem
{
     class Program
     {
         static void Main(string[] args)
         {
             IWindsorContainer container = new WindsorContainer();

container.Register(Component.For<IEventHandler<SomethingCreatedEvent>>().ImplementedBy<CreateSomethingEventHandler>());

             var publisher = new Publisher(container);

             // This works
             var created = new SomethingCreatedEvent();
             publisher.Publish(created);

             // This does not.
             var list = new List<IEvent>() { new
SomethingCreatedEvent() };
             foreach (var e in list)
                 publisher.Publish(e);

         }
     }

     public interface IEvent { }

     public class SomethingCreatedEvent : IEvent { }

     public interface IEventHandler<T>  where T : IEvent
     {
         void Handle(IEvent @event);
     }

     public class CreateSomethingEventHandler :
IEventHandler<SomethingCreatedEvent>
     {
         void IEventHandler<SomethingCreatedEvent>.Handle(IEvent
@event)
         {
             Console.WriteLine(this.GetType().Name);
         }
     }

     public class Publisher
     {
         public Publisher(IWindsorContainer container)
         {
             _container = container;
         }

         public void Publish<T>(T @event) where T : IEvent
         {
             var handler = _container.Resolve<IEventHandler<T>>();
             handler.Handle(@event);
         }

         private IWindsorContainer _container;
     }
}

In the code example I give (which should run with a reference to
Windsor).
If I call Publisher.Publish with the explicit type Windsor can resolve
the component. However if I use the second method (which is what to
do). Windsor will not resolve the component and throws an exception
telling me it cannot find a service supporting IEvent. I can
understand why Windsor cannot find a service implementing IEvent.
My question is how can I Windsor to resolve correctly?

Thanks

Paul

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