Decorate_StructureMap2.cs

public static class IoC {
    public static IContainer Initialize() {
        ObjectFactory.Initialize(x =>
        {
            x.Scan(scan =>
                    {
                        scan.TheCallingAssembly();
                        scan.WithDefaultConventions();
                    });
            
            // just a plain C# decorator
            x.For<IReportService>().Use<ReportService>()
                .EnrichWith(i => new ReportCacheDecorator(i));

            // Castle DynamicProxy generated decorator
            var proxyGenerator = new ProxyGenerator();
            x.For<IReportService>().Use<ReportService>()
                .EnrichWith(i => proxyGenerator.CreateInterfaceProxyWithTargetInterface<IReportService>(i, new CacheInterceptor()));
        });
        return ObjectFactory.Container;
    }
}

Decorate_StructureMap3.cs

public static class IoC {
    public static IContainer Initialize() {
        ObjectFactory.Initialize(x =>
        {
            x.Scan(scan =>
                    {
                        scan.TheCallingAssembly();
                        scan.WithDefaultConventions();
                    });
                    
            // just a plain C# decorator
            x.For<IReportService>().Use<ReportService>()
                .DecorateWith(i => new ReportCacheDecorator(i));

            // Castle DynamicProxy generated decorator
            // notice I was able to drop the explicit type parameter on CreateInterfaceProxyWithTargetInterface
            var proxyGenerator = new ProxyGenerator();
            x.For<IReportService>().Use<ReportService>()
                .DecorateWith(i => proxyGenerator.CreateInterfaceProxyWithTargetInterface(i, new CacheInterceptor()));
        });
        return ObjectFactory.Container;
    }
}