Lifecycle guide for System.Collections.NonGeneric from Microsoft

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

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📅 Last update on 2026-01-21

What is System.Collections.NonGeneric?

Automate product release and end-of-life management

Provides classes that define older non-generic collections of objects, such as lists, queues, hash tables and dictionaries. Developers should prefer the generic collections in the System.Collections package. Commonly Used Types: System.Collections.ArrayList System.Collections.Hashtable System.Collections.CollectionBase System.Collections.ReadOnlyCollectionBase System.Collections.Stack System.Collections.SortedList System.Collections.DictionaryBase System.Collections.Queue System.Collections.Comparer System.Collections.CaseInsensitiveComparer When using NuGet 3.x this package requires at least version 3.4.

The entire lifecycle of System.Collections.NonGeneric

The following figure shows you the visualised product life cycle of System.Collections.NonGeneric. 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.