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copied!<p>Following our comments exchange, you problem now is seen in a different light than the original post. You can't have directly what multiple inheritance would have given you. But there are various ways you can get very close. </p> <p>Variant 1: Trick your special classes that need <code>MyFunction()</code> into receiving it as an extension method. To accomplish this, you need a "differentiator"; in my example that is the ILwA interface. Note that it has to define another commonality, not <code>MyFunction()</code>. A getter (or a setter) will do. Limitation here is that MyFunction doesn't have access to private members. </p> <pre><code>//instead of the lightweight interface (but use interface if it makes more sense) abstract class LwBase abstract class HwBase : LwBase public interface IADiff { int APropTrick { get; } } // lightweight class definitions class LwA : LwBase, IADiff class LwB : LwBase // full class definitions class FullA : HwBase, IADiff class FullB : HwBase public static class AExtensions { public static void MyFunction(this IADiff o) { // impl. } } </code></pre> <p>Variant 2: use a common class that provides implementation of <code>MyFunction()</code> and "redirect" to it:</p> <pre><code>abstract class LwBase abstract class HwBase : LwBase public interface IADiff { int MyFunction(); } public class AConcr : IADiff //implemenst Myfunction() // lightweight class definitions class LwA : LwBase, IADiff { private AConcr a = new AConcr(); public int MyFunction() { return a.MyFunction(); } } class LwB : LwBase // full class definitions class FullA : HwBase, IADiff { private AConcr a = new AConcr(); public int MyFunction() { return a.MyFunction(); } } class FullB : HwBase </code></pre> <p>Variant 3: I stumbled on <a href="http://www.codeproject.com/Articles/10072/Simulated-Multiple-Inheritance-Pattern-for-C" rel="nofollow noreferrer">this article</a> as I was researching your question. I can't quickly say if it's a viable option, but it certainly provides ideas.</p> <p>Credits: I am heavily borrowing from <a href="https://stackoverflow.com/questions/2515886/design-pattern-to-use-instead-of-multiple-inheritance">this SO thread</a>, as well as using <a href="http://www.dofactory.com/Patterns/Patterns.aspx" rel="nofollow noreferrer">this nice site</a> as a reference.</p>

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