When to Use Composite Pattern in C#: Decision Guide with Examples

A practical decision guide for applying the Composite design pattern in C#. Covers the core problem it solves (treating leaves and composites uniformly in recursive tree structures), four signals that indicate it's the right fit, and three concrete C# implementations: file system entries, UI component trees, and organizational hierarchies. Also addresses when NOT to use it (flat collections, fixed shallow hierarchies, diverging leaf/composite behavior), compares it against simpler alternatives like List<T>, inheritance, Visitor, and Strategy patterns, and provides a five-question decision framework to evaluate fit.