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copied!<p>I'm sorry to plug <a href="http://simpleinjector.codeplex.com" rel="nofollow">Simple Injector</a> here, but I couldn't help noticing that you're struggling with something that is child's play in Simple Injector. In Simple Injector you can do what you want in two lines of code:</p> <pre class="lang-cs prettyprint-override"><code>// using SimpleInjector; // using SimpleInjector.Extensions; var container = new Container(); container.RegisterManyForOpenGeneric( typeof(ICommandHandler<>), assembly); container.RegisterSingleDecorator( typeof(ICommandHandler<>), typeof(FactoryCommandHandler<>)); </code></pre> <p>These two simple lines ensure the following:</p> <ul> <li>The supplied assembly is searched for concrete implementations of <code>ICommandHandler<T></code>.</li> <li>If a concrete implementations has defines the <code>ICommandHandler<T></code> interface multiple times, it is registered for each closed-generic version of that interface.</li> <li>The <code>FactoryCommandHandler<T></code> is registered to be wrapped around <code>ICommandHandler<T></code> implementations. For each closed-generic version of <code>ICommandHandler<T></code> a single instance of that generic <code>FactoryCommandHandler<T></code> is returned.</li> <li>A <code>Func<ICommandHandler<T>></code> is injected into that <code>FactoryCommandHandler<T></code> that allows creating the decoratee (the instance that is wrapped). This effectively delays the creation of that instance. </li> <li>The injected factory will preserve the lifestyle of the decoratee.</li> </ul> <p>The <code>FactoryCommandHandler<T></code> only depends on a <code>Func<T></code> which is a singleton. The <code>FactoryCommandHandler<T></code> can therefore be registered itself as a singleton (what happens in the registration above). If it depends on dependencies of other lifestyles, it might be better to register it as <em>transient</em>.</p>

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