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List
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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