Steven Giesel • 4/26/2022

ReadOnlyCollection is not an immutable collection

Read Original

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).

0 comments
#c #.net #Immutable Collections
ReadOnlyCollection is not an immutable collection

Comments

No comments yet

Be the first to share your thoughts!

Browser Extension

Get instant access to AllDevBlogs from your browser

Top of the Week

1
React, useEffect, and Stale Closures: How to Avoid Them with Dependencies and useRef
Jivbcoop • 4 votes
2
Using Browser Apis In React Practical Guide
Jivbcoop • 2 votes
3
Better react-hook-form Smart Form Components
Maarten Hus • 2 votes
4
Top picks — 2026 January
Paweł Grzybek • 1 votes
5
In Praise of –dry-run
Henrik Warne • 1 votes
6
Deep Learning is Powerful Because It Makes Hard Things Easy - Reflections 10 Years On
Ferenc Huszár • 1 votes
7
Vibe coding your first iOS app
William Denniss • 1 votes
8
AGI, ASI, A*I – Do we have all we need to get there?
John D. Cook • 1 votes
9
Quoting Thariq Shihipar
Simon Willison • 1 votes
10
Dew Drop – January 15, 2026 (#4583)
Alvin Ashcraft • 1 votes