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    <p>How about something like the following?</p> <pre><code>public LinkedList&lt;IEntity&gt; GetList(Type type) { if (typeof(IUndead).IsAssignableFrom(type)) return undeadEntities; if (typeof(ILiving).IsAssignableFrom(type)) return livingEntities; if (typeof(IObject).IsAssignableFrom(type)) return objects; } </code></pre> <p>Then you would call it like this:</p> <pre><code>var myUndeads = GetList(typeof(IUndead)); var myLivings = GetList(typeof(ILiving)); // etc </code></pre> <p>The same type of logic could be implemented in your deletes, add, and other methods, and you never need a concrete instance of an object to access them. </p> <p>The <code>IsAssignableFrom</code> logic handles subclassing just fine (i.e. you could have a <code>CatZombie</code>, which derives from <code>Zombie</code>, which implements <code>IUndead</code>, and this would still work). This means you still only have to create one Delete method, something like the following:</p> <pre><code>public void Delete(IEntity e, World world) { if (typeof(IUndead).IsAssignableFrom(type)) undeadEntities.Remove(e); if (typeof(ILiving).IsAssignableFrom(type)) livingEntities.Remove(e); if (typeof(IObject).IsAssignableFrom(type)) objects.Remove(e); } </code></pre> <p><strong>EDIT:</strong> I noticed your comment on zmbq's answer regarding performance; this is definitely NOT fast. If you need high performance, use an enum-style approach. Your code will be more verbose and require more maintenance, but you'll get much better performance.</p>
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    1. POC#, generic way to access different lists within a class
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    1. COYeah sorry about that. I'll give you one up for the thought though. I better update my post to reflect this! Sorry once again
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    2. COThis is actually worse than using generics. If you use generics, the compiler will catch you if you pass a String or a DataSet. And you're still facing the trouble of getting an object that implements IAlive AND IUndead.
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    3. CO@zmbq "And you're still facing the trouble of getting an object that implements IAlive AND IUndead." I'm not sure what you mean; `Delete` will handle the multiple interfaces just fine. Are you talking about `GetList` not handling multiple interfaces? In that case your solution doesn't solve the problem either. The fix for that isn't hard though, you just need to combine the results from all relevant interfaces (your solution would need to do that as well)
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