Steven Giesel • 4/26/2022

ReadOnlyCollection is not an immutable collection

This technical article clarifies that a ReadOnlyCollection in C# is not immutable; it's a read-only view of a mutable underlying collection. The post demonstrates with code examples how modifying the original list changes the ReadOnlyCollection, contrasts it with truly immutable types like ImmutableArray, and discusses the performance trade-offs (O(1) vs. O(n) operations).

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#c #.net #Immutable Collections