Extending Castle DynamicProxy

using System;
using System.Collections.Generic;
using System.Linq;
using Castle.DynamicProxy;
using Castle.DynamicProxy.Generators;
using Castle.DynamicProxy.Contributors;

namespace Castle.ExtensibleDynamicProxy
{
    public class ExtensibleInterfaceProxyWithTargetGenerator : InterfaceProxyWithTargetGenerator
    {
        public ExtensibleInterfaceProxyWithTargetGenerator(ModuleScope scope, Type theInterface, ExtensibleProxyBuilder proxyBuilder)
            : base(scope, theInterface)
		{
            _proxyBuilder = proxyBuilder;
		}

        ExtensibleProxyBuilder _proxyBuilder;

        protected override IEnumerable<Type> GetTypeImplementerMapping(Type[] interfaces, Type proxyTargetType, out IEnumerable<ITypeContributor> contributors, INamingScope namingScope)
        {
            IEnumerable<ITypeContributor> contr;
            var ret = base.GetTypeImplementerMapping(interfaces, proxyTargetType, out contr, namingScope);
            var list = contr.ToList();
            list.AddRange(_proxyBuilder.Contributors);
            contributors = list;
            return ret;
        }
    }
}