<ul data-eligibleForWebStory="true"><li>Inheritance is default for reusing behavior, but in evolving systems, composition offers more flexibility.</li><li>Inheritance leads to rigid hierarchies, tight coupling, low reusability, and poor maintainability.</li><li>Composition injects behavior at runtime, offering modularity, loose coupling, flexibility, and testability.</li><li>Example: Multi-Channel Notification Service in .NET demonstrates composition usage.</li><li>NotificationService uses composition with INotificationChannel to send messages through different channels.</li><li>Composition allows mixing channels without subclassing, fragile overrides, or bloating class hierarchy.</li><li>In modern .NET applications, composition leads to simpler, more maintainable code.</li><li>Inheritance still has its uses, but for flexibility, reusability, and testability, composition is preferred.</li></ul>

Why Composition over Inheritance Is More Than Just a Design Principle

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