Castle Windsor Tutorial Part 3 – Dynamic Proxy (Interceptors)

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Inversion of Control – Interceptors

In the third part of this series looking at Castle Windsor we will take a look at the idea of Interceptors. Interceptors (or Dynamic Proxies as they are called in Castle) are an implementation of AOP (Aspect Oriented Programming). This allows us to “intercept” calls to methods and “proxy” the call and in the process “inject” our own code.

Using the example from the first tutorial we will create a simple interceptor to wrap the calls to a method and write the interception out to the console window.

All interceptors need to implement the IInterception interface. This specifies a single method needs to exist with the signature void Intercept(IInvovation obj) here is an example of it in use.

public class MyIntercept : IInterceptor {
    public void Intercept(IInvocation invocation) {
        Console.WriteLine(">> intercepted in <<");
        Console.WriteLine(">> intercepted out <<");

Lets start by adding the code above to our classes.cs file (from Tutorial 1)

We now need to register the Interceptor with the container just like all the other components. Here is the code to do this.


our installer should now look like this.

using Castle.MicroKernel.Registration;
using Castle.DynamicProxy;

namespace IOCExample
    public class Installers : IWindsorInstaller
        public void Install(Castle.Windsor.IWindsorContainer container, Castle.MicroKernel.SubSystems.Configuration.IConfigurationStore store)







No we have to tell the interceptor what to intercept, we dont want it doing it to everything, so lets add the interception attribute to our classes. Add the following to the class declaration of the Shell class


it should look like this.

    public class Shell : IShell
        public MainWindow window { get; set; }

        public void Run()

Now add the same declaration to the StartPageViewModel class, which should then look like this

    public class StartPageViewModel : IStartPageViewModel

        public IStartPageModel viewmodel { get; set; }

        public StartPageViewModel(){}

        public IStartPageModel Get()
            viewmodel.Heading.Caption = "App-Code.Net";
            viewmodel.SubHeading.Caption = "Hello World";
            return viewmodel;

If you run the example code you should see the output of the interception in the Debug Output Window.

	>> intercepted in StartPageViewModel <<
	>> intercepted out StartPageViewModel <<
	>> intercepted in Shell <<
	>> intercepted out Shell <<

So far we have seen that we can attribute our classes to intercept the calls to methods on them. Its also possible to do this from the installation.
we can do this by adding the following statement to the registration of our classes.


as an example the Shell class registration would look like this. I’ve formatted the registration so that its readable.


The code below shows this in context. Note: i commented out the attribute on the Shell class so that this would work

using Castle.MicroKernel.Registration;
using Castle.DynamicProxy;
using Castle.Core;

namespace IOCExample
    public class Installers : IWindsorInstaller
        public void Install(Castle.Windsor.IWindsorContainer container, Castle.MicroKernel.SubSystems.Configuration.IConfigurationStore store)








When we registered the interceptor we gave it a name “myinterceptor”, it is this name that we are referencing on the Interceptor(“myinterceptor”)] attribute and also in the component registration InterceptorReference.ForKey(“myinterceptor”) the .Anywhere setting at the end of the registration where abouts in the interception chain that it should be place. For more information on this please refer to Castle Windsor Dynamic Proxy (Interceptors)

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