List vs. IList in C#: When Should You Choose IList?

List vs. IList in C#: Choosing the Right Interface

C# offers both List<T> and IList<T> for managing object collections. While seemingly similar, their differences significantly impact code design.

When to Prefer IList<T>

Using interfaces over concrete implementations is crucial when designing libraries for external use. IList<T> provides this abstraction. Switching the underlying collection type (e.g., from List<T> to LinkedList<T>) later won't break external code, as long as the new type implements IList<T>.

Internal Considerations

For internal code, the choice might seem less critical. List<T> may suffice if external exposure isn't a concern. However, adopting IList<T> initially is good practice, safeguarding against future changes and potential external library integration.

Why Avoid Exposing List<T> Directly

Directly exposing List<T> creates tight coupling between your class and its consumers. Changing the underlying collection type later (for performance reasons, for example) would necessitate updating all dependent code. Using IList<T> keeps implementation details hidden and promotes loose coupling.

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