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copied!<p>The best introduction to dependency injection that I've come across is actually the <a href="http://wiki.github.com/enkari/ninject/" rel="nofollow noreferrer">quick series of articles that form a walkthrough of the concepts</a> on the <a href="http://ninject.org/" rel="nofollow noreferrer">Ninject</a> wiki site.</p> <p>You haven't really given much background on what you're trying to accomplish, but it looks to me like you're trying to design a "plug-in" architecture. If this is the case - your feeling is correct - both those designs are in a word, horrible. The first one will be relatively slow (database <em>and</em> reflection?), has massive unnecessary dependencies on a database layer, and will not scale with your program, since each new class will have to be entered into the database. What's wrong with just using reflection?</p> <p>The second approach is about unscalable as it comes. Every time you introduce a new class, old code has to be updated, and something has to "know" about every object that you'll be plugging in - making it impossible for third parties to develop plugins. The coupling you add, even with something like a Locator pattern, means that your code is not as flexible as it could be.</p> <p>This may be a good opportunity to use dependency injection. Read the articles I linked. The key idea is that the dependency injection framework will use a configuration file to dynamically load the classes that you specify. This makes swapping out components of your program very simple and straightforward.</p>

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