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

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

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

When to Prefer IList<t></t>

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

Internal Considerations

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

Why Avoid Exposing List<t></t> Directly

Directly exposing List<t></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></t> keeps implementation details hidden and promotes loose coupling.

The above is the detailed content of List vs. IList in C#: When Should You Choose IList?. For more information, please follow other related articles on the PHP Chinese website!