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copied!<p>I'm not sure if dynamically overriding a class's functionality is possible, but you can achieve something similar by using different interfaces. Depending on the context you want to use this in, it may require only small redesign.</p> <p>The standard way of doing it would be this:</p> <pre><code>using System; class MyClass { public virtual void A() { Console.WriteLine("MyClass.A"); } public virtual void B() { Console.WriteLine("MyClass.B"); } } class ClassA : MyClass { public override void A() { Console.WriteLine("AttachmentA.A"); base.A(); } } class ClassB : MyClass { public override void B() { Console.WriteLine("AttachmentB.B"); } } public class Program { public static void Main(string[] Args) { MyClass aaa = new ClassA(); MyClass bbb = new ClassB(); aaa.A(); // prints MyClass.A aaa.B(); // prints MyClass.B (aaa as ClassA).A(); // prints AttachmentA.A (aaa as ClassA).B(); // prints MyClass.B bbb.A(); // prints MyClass.A bbb.B(); // prints MyClass.B (bbb as ClassB).A(); // prints AttachmentB.A + MyClass.A (bbb as ClassB).B(); // prints AttachmentB.B } } </code></pre> <p>Here's another example, similar to what blowdart suggested:</p> <pre><code>interface ICallMe { bool A(); bool B(); } class MyClass { public ICallMe Attachment { get; set; } public void A() { bool BaseFunction = true; if (Attachment != null) BaseFunction = Attachment.A(); if (BaseFunction) Console.WriteLine("MyClass.A"); } public void B() { bool BaseFunction = true; if (Attachment != null) BaseFunction = Attachment.B(); if (BaseFunction) Console.WriteLine("MyClass.B"); } } class ClassA : ICallMe { public bool A() { Console.WriteLine("AttachmentA.A"); return true; } public bool B() { Console.WriteLine("AttachmentA.B"); return false; } } static class Program { static void Main(string[] args) { MyClass aaa = new MyClass(); aaa.A(); // prints MyClass.A aaa.B(); // prints MyClass.B aaa.Attachment = new ClassA(); aaa.A(); // should print AttachmentA.A <newline> MyClass.A aaa.B(); // should print AttachmentB.B } } </code></pre> <p>This only allows for a single attachment to be added. If you wanted to override the behavior of several functions separately, you could use a Collection of some sort to hold the attachments. Within the base class you'd need to loop through them and find the one you want to execute.</p>

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