Lifecycle guide for System.Collections from Microsoft

All releases, patches, maintenance and support periods at a glance

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📅 Last update on 2026-04-17

What is System.Collections?

Automate product release and end-of-life management

Provides classes that define generic collections, which allow developers to create strongly typed collections that provide better type safety and performance than non-generic strongly typed collections. Commonly Used Types: System.Collections.Generic.List<T> System.Collections.Generic.Dictionary<TKey, TValue> System.Collections.Generic.Queue<T> System.Collections.Generic.Stack<T> System.Collections.Generic.HashSet<T> System.Collections.Generic.LinkedList<T> System.Collections.Generic.EqualityComparer<T> System.Collections.Generic.Comparer<T> System.Collections.Generic.SortedDictionary<TKey, TValue> When using NuGet 3.x this package requires at least version 3.4.

The entire lifecycle of System.Collections

The following figure shows you the visualised product life cycle of System.Collections. You can see all releases with the latest patch version, the long-term support characteristics (orange flag in the green circle, the periods for version provision, maintenance and support.