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Why does List<T> implement IReadOnlyList<T> in .NET 4.5?
List<T> isn't read only...
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The interfaces
IReadOnlyListandIReadOnlyCollectionare somewhat confusing because they do not mean that the collection is read-only, just that read-only access is supported. From the MSDN documentation (scroll down to Remarks)A better name would be
IReadable, see Why doesn't genericICollectionimplementIReadOnlyCollectionin .NET 4.5?. Furthermore, this implies thatIListshould inheritIReadOnlyListalbeit it does not due to backwards compatibility, see Why doesn'tIList<T>inherit fromIReadOnlyList<T>?.