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POAOP with Ninject Interception, Castle DynamicProxy and WPF window: Can't find XAML resource in DynamicProxy of window
 

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  1. POAOP with Ninject Interception, Castle DynamicProxy and WPF window: Can't find XAML resource in DynamicProxy of window
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    <p>In our real world application we defined an attribute that is used to enable logging in methods or classes (the usual AOP use case). When we apply this attribute to a WPF window class, objects of this class can't be created by Ninject. Here is a minimal example to reproduce the issue:</p> <p><strong>dummy interceptor for logging:</strong></p> <pre><code>public class MyInterceptor: IInterceptor { public void Intercept(IInvocation invocation) { Console.WriteLine("Calling {0} at {1}", invocation.Request.Method.Name, DateTime.Now); invocation.Proceed(); } } </code></pre> <p><strong>the corresponding attribute:</strong></p> <pre><code>public class MyAttribute: InterceptAttribute { public override IInterceptor CreateInterceptor(IProxyRequest request) { return new MyInterceptor(); } } </code></pre> <p><strong>the window class (completely empty, only the automatically generated empty grid is inside):</strong></p> <pre><code>[My] public partial class MainWindow: Window { public MainWindow() { InitializeComponent(); } } </code></pre> <p><strong>and finally the app startup code where the object is requested:</strong></p> <pre><code>public partial class App: Application { private void Application_Startup(object sender, StartupEventArgs e) { var kernel = new StandardKernel(new NinjectSettings() { LoadExtensions = false }, new DynamicProxyModule()); var window = kernel.Get&lt;MainWindow&gt;(); window.ShowDialog(); } } </code></pre> <p>When requesting the window via <code>kernel.Get&lt;MainWindow&gt;();</code> an <code>TargetInvocationException</code> is thrown with an inner exception telling me that <code>Castle.Proxies.MainWindowProxy</code> doesn't have a resource specified by URI <code>"/NinjectInterceptionWPF;component/mainwindow.xaml"</code> where <code>NinjectInterceptionWPF</code> is our assembly's short name.</p> <p>When we look at the automatically created <code>InitializeComponent</code> of <code>MainWindow</code> we can see that an URI is created to address the XAML code, which seems to be missing for the proxy:</p> <pre><code>System.Uri resourceLocater = new System.Uri("/NinjectInterceptionWPF;component/mainwindow.xaml", System.UriKind.Relative); #line 1 "..\..\..\MainWindow.xaml" System.Windows.Application.LoadComponent(this, resourceLocater); </code></pre> <p>I already played around a bit and tried to use an absolute URI but <code>LoadComponent</code> only accepts relative ones.</p> <p>Some internet searching shows that a lot of people use Ninject Interception and DynmaicProxy for WPF binding (INotifyPropertyChanged), so I think in general it should be possible to build a proxy of a WPF window.</p> <p>But how?</p>
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