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    <p>You can't do this, and for good reasons. This is not specific to Castle Windsor. The issue is that you have no guarantee that the methods are marked as <code>virtual</code> and therefore you have an inconsistency where there is some state coming from the wrapped object and some state coming from the proxy object.</p> <p>Think of the following very simple example:</p> <pre><code>abstract class AbstractPerson { public int Age { get; protected set; } public abstract void Birthday(); } class Person : AbstractPerson { public Person(int age) { Age = age; } public override Birthday() { Age++; } } </code></pre> <p>Let's say that we want to create a proxy for <code>AbstractPerson</code> to intercept <code>Birthday</code>.</p> <pre><code>class PersonProxy : AbstractPerson { readonly AbstractPerson wrappedPerson; public PersonProxy(AbstractPerson person) { wrappedPerson = person; } public override void Birthday() { DoInterceptors(); wrappedPerson.Birthday(); } public void DoInterceptors() { // do interceptors } } </code></pre> <p>Notice that we can't override <code>Age</code> because it's not marked as <code>virtual</code>. This is where the yucky state inconsistencies will come from:</p> <pre><code>Person knuth = new Person(71); PersonProxy proxy = new PersonProxy(knuth); Console.WriteLine(knuth.Age); knuth.Birthday(); Console.WriteLine(knuth.Age); Console.WriteLine(proxy.Age); </code></pre> <p>This will print</p> <pre><code>71 72 0 </code></pre> <p>to the console. What happened? Because <code>Age</code> is not marked as virtual, our proxy object can't override the base behavior and call <code>wrappedPerson.Age</code>. This example even shows that adding <code>Age = wrappedPerson.Age</code> to the constructor for <code>PersonProxy</code> will not help. Our proxy isn't really a proxy. This is why you can not wrap existing objects.</p>
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    1. POWrapping existing objects to intercept method/property calls in .NET
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    1. USjason
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      1. VTUpMod
    1. CODoesn't your example cater to a subset of existing objects? Why not reject proxying objects that fit your example and allow proxying for all other cases?
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      1. USTobias Hertkorn
 

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