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POUnity / EntLib: Injecting a dependency into a CustomTraceListener
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copied!<p>Sorry, this is quite a special topic so this may not be of interest to many. :-(</p> <p>However, I need to do the following thing:</p> <ul> <li><p>I have an application that provides logging to some kind of console window (it's a WPF window, because of application requirements and because the application needs to look flashy even here - our special customer asked for that and talks about it every time we meet)</p></li> <li><p>To provide thread - agnostic logging I created an interface / implementation pair "IGUIController" / "GUIController"</p></li> </ul> <p>So far, so good. It's all fine.</p> <p>However:</p> <ul> <li>I need my own custom trace listener (I call it "GUITraceListener") which uses the IGUIController - interface to write specific log messages to that flashy WPF - window</li> </ul> <p>So far, my solution is to have a hacked, old skool code smell singleton - style "Current" - property on my GUIController (yes, and I'm ashamed, and I DO know that this is terrible) which I invoke like this:</p> <pre><code>GUIController.Current.Log(message); </code></pre> <p>Obviously, this is a no - go.</p> <p>So, the correct way to do that would be to inject the dependency (of course). However, when I do that, I get the complaint (runtime), that I don't provide a constructor with 0 (zero) arguments for my GUITraceListener - class.</p> <p>As a matter of fact, I get that here:</p> <pre><code>EnterpriseLibraryContainer.ConfigureContainer(configurator, ConfigurationSourceFactory.Create()); </code></pre> <p>And the complaint is:</p> <p>ArgumentException was unhandled Unable to find appropriate 0 argument constructor for GUITraceListener</p> <p>This is really bad. I mean, Unity is part of the Enterprise Library, why didn't those guys simply add the possibility of injecting my dependencies?</p> <p>Clarification:</p> <p>What I want to have in the end is:</p> <pre><code> /// <summary> /// Constructor /// </summary> /// <param name="guiController"></param> public GUITraceListener(IGUIController guiController) { // Store the dependencies this.m_GUIController = guiController; } </code></pre>

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