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POEnt Lib 6 / Unity 3: Injecting a dependency into a CustomTraceListener
 

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  1. POEnt Lib 6 / Unity 3: Injecting a dependency into a CustomTraceListener
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    <p>CONTEXT:</p> <p>I am using Enterprise Library 6 and Unity 3 throughout my solution to manage cross cutting concerns and as a lightweight container for managing Dependency Injection. I have a requirement to develop a Custom Trace Listener. I need to inject a dependency into that Custom Trace Listener.</p> <p>This functionality is available in Enterprise Library 5 and Unity 2. The following link provides a nice example of how it can be achieved (my own requirements are almost similar to those outlined in the link):</p> <p><a href="https://stackoverflow.com/questions/3438362/unity-entlib-injecting-a-dependency-into-a-customtracelistener">Unity / EntLib: Injecting a dependency into a CustomTraceListener</a></p> <p>However, it seems as though it is not a straightforward migration in Enterprise Library 6, for the following reasons:</p> <p>The Ent Lib 6 TraceListenerData class no longer makes available an override against the:</p> <p><code>GetCreationExpression()</code></p> <p>...method. In Ent Lib 6 the new functionality is provided in the:</p> <p><code>CoreBuildTraceListener()</code></p> <p>...method. My understanding is that the Ent Lib 5 <code>GetCreationExpression()</code> allowed 'marker's' to be placed in the returned expression that could be substituted when the Unity Container was resolved. The new <code>CoreBuildTraceListener()</code> returns a new instance of the Trace Listener.</p> <p>Also, Enterprise Library no longer uses the Unity container to resolve instances. The:</p> <p><code>EnterpriseLibraryCoreExtension</code></p> <p>...has been removed. The new approach would be something along the lines of:</p> <p>container.RegisterInstance(logWriterFactory.Create());</p> <p>However, for me this means that the CoreBuildTraceListener() is invoked (on logWriterFactory.Create()) before any call can be made to resolve a Interface through the Unity Container.</p> <p>QUESTION(s):</p> <p>Using Enterprise Library 6 and Unity 3, is it possible to either:</p> <p>a. Get a hold of the Unity Container in the <code>CoreBuildTraceListener()</code> method at the correct time - so I can find the appropriate Interface I need to inject into my Custom Trace Listener when the Custom Trace Listener is created or...</p> <p>b. Is there a new approach to achieving the same end-goal that I don't know about (if possible, please could you provide a simple example?) or...</p> <p>c. Has this functionality regressed?</p>
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