Lifecycle guide for System.Collections.Specialized from Microsoft

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

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📅 Last update on 2026-02-09

What is System.Collections.Specialized?

Automate product release and end-of-life management

Provides older specialized non-generic collections; for example, a linked list dictionary, a bit vector, and collections that contain only strings. Commonly Used Types: System.Collections.Specialized.NameValueCollection System.Collections.Specialized.NameObjectCollectionBase System.Collections.Specialized.StringCollection System.Collections.Specialized.IOrderedDictionary System.Collections.Specialized.HybridDictionary System.Collections.Specialized.OrderedDictionary System.Collections.Specialized.ListDictionary System.Collections.Specialized.StringDictionary System.Collections.Specialized.BitVector32 When using NuGet 3.x this package requires at least version 3.4.

The entire lifecycle of System.Collections.Specialized

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