Jon Skeet • 12/31/2025

Changing Immutable Collections

The article details a C# developer's migration from using ImmutableList<T> and ImmutableDictionary<TKey, TValue> to ImmutableArray<T> and FrozenDictionary<TKey, TValue>. It explains the two distinct usage patterns for immutable collections and why the latter types offer better performance for a 'create-once' pattern. The post covers the practical steps and considerations involved in the migration process within a real project.

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#performance #c #Immutable Collections