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POResolve externally created object instance with no public constructor
 

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    <p>Using the adapter pattern, combined with IoC (specificly Unity), I would like to create a new instance of a object of which the properties point back to the adaptee's propeties (basicly mapping the adaptee to a target object).</p> <p>As a example I have the following class structures:</p> <pre><code>public class Adaptee { private Adaptee() { } public int MyProperty { get; set; } public static Adaptee New() { return new Adaptee(); } } public class Target { public int MyProperty { get; set; } } public class Adapter : Target { public Adapter(Adaptee adaptee) { this.MyProperty = adaptee.MyProperty; } } public class MyTestClass { public Target MyTarget { get; set; } } </code></pre> <p>The problem is that the Adaptee is not under my control and it has no public constructor, hence the use of the adapter. So Adaptee gets created as follow</p> <pre><code>Adaptee adaptee = Adaptee.New(); adaptee.MyProperty = 5; </code></pre> <p>In the actual code the above code would be executed in a externally controlled assembly and then passed to the following code:</p> <pre><code>using (UnityContainer container = new UnityContainer()) { container .RegisterType&lt;MyTestClass&gt;( new InjectionProperty("MyTarget")); container.RegisterInstance&lt;Adaptee&gt;(adaptee, new ExternallyControlledLifetimeManager()); MyTestClass myTestClass = container.Resolve&lt;MyTestClass&gt;(); } </code></pre> <p>I would like the execution of the code to result in the following:</p> <pre><code>Debug.Assert(myTestClass != null); Debug.Assert(myTestClass.MyTarget != null); Debug.Assert(myTestClass.MyTarget.MyProperty == adaptee.MyProperty); </code></pre> <p>This means that a resolved instance of Adapter should be injected into the MyTarget property of the myTestClass instance. The instance of Adapter should have been created with externally created instance of Adaptee.</p> <p>The following code:</p> <pre><code>container .RegisterType&lt;MyTestClass&gt;( new InjectionProperty("MyTarget")); </code></pre> <p>should actually result in this:</p> <pre><code>container .RegisterType&lt;MyTestClass&gt;( new InjectionProperty("MyTarget", container.Resolve&lt;Adapter&gt;())); </code></pre> <p>This does not seem to be possible, since no instance of Adapter exist yet and it has a private constructor.</p> <p>Should I use interception or something to achive this?</p>
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