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POHow can I inject run-time parameters along with a volatile dependency into a constructor with Castle Windsor?
 

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  1. POHow can I inject run-time parameters along with a volatile dependency into a constructor with Castle Windsor?
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    <p>Some of my classes have a constructor similar to the following:</p> <pre><code>public class MyComponent : BaseComponent, IMyComponent { public MyComponent(IPostRepository postsRepo, int postId, ICollection&lt;string&gt; fileNames) { // ... } } </code></pre> <p><code>IPostRepository</code> is a volatile dependency, but it can be initialized at application start. The postId and fileNames arguments are only known at run time.</p> <p><strong>How can I use Castle Windsor (3.2.0, if it matters) to handle the injection of the <code>IPostRepository</code> dependency while still allowing run-time constructor parameters?</strong></p> <p>(While one approach might be to refactor <code>MyComponent</code>, this would be a significant undertaking as many other portions of the code already refer to <code>MyComponent</code>.)</p> <p><strong>Here's where I've gotten so far</strong>: I think that I need to create a <code>MyComponentFactory</code>. The interface of <code>MyComponentFactory</code> would look like</p> <pre><code>public interface IMyComponentFactory { IMyComponent Create(params object[] args); } </code></pre> <p>This <code>IMyComponentFactory</code> would be injected into the layer above (the controller in my case) like so:</p> <pre><code>public class MyController : Controller { private IMyComponentFactory _myComponentFactory; public MyController(IMyComponentFactory myComponentFactory) { _myComponentFactory = myComponentFactory; } public ActionResult MyAction(int postId) { List&lt;string&gt; fileNames = new List&lt;string&gt;(); // ... // Creates a new instance of the resolved IMyComponent with the IPostRepository that was injected into IMyComponentFactory and the run time parameters. IMyComponent myComponent = _myComponentFactory.Create(postId, fileNames); // Now do stuff with myComponent return View(); } } </code></pre> <p>Finally, I have attempted to let Castle Windsor create the factory implementation by registering my <code>IMyComponentFactory</code> in the composition root like so:</p> <pre><code>// Add Factory facility container.AddFacility&lt;TypedFactoryFacility&gt;(); container.Register(Component.For&lt;IMyComponentFactory&gt;().AsFactory()); </code></pre> <p>Doing this results in a <code>DependencyResolverException</code> with a message of</p> <blockquote> <p>Could not resolve non-optional dependency for 'Playground.Examples.Components.MyComponent' (Playground.Examples.Components.MyComponent). Parameter 'postId' type 'System.Int32'</p> </blockquote> <p>The error makes sense, and I'm guessing that I need to create a custom implementation of <code>IMyComponentFactory</code>, but I'm not sure how to go about it.</p>
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