Lifecycle guide for System.ObjectModel from Microsoft

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

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📅 Last update on 2026-04-20

What is System.ObjectModel?

Automate product release and end-of-life management

Provides types and interfaces that allow the creation of observable types that provide notifications to clients when changes are made to it. Commonly Used Types: System.ComponentModel.INotifyPropertyChanged System.Collections.ObjectModel.ObservableCollection<T> System.ComponentModel.PropertyChangedEventHandler System.Windows.Input.ICommand System.Collections.Specialized.INotifyCollectionChanged System.Collections.Specialized.NotifyCollectionChangedEventArgs System.Collections.Specialized.NotifyCollectionChangedEventHandler System.Collections.ObjectModel.KeyedCollection<TKey, TItem> System.ComponentModel.PropertyChangedEventArgs System.Collections.ObjectModel.ReadOnlyDictionary<TKey, TValue> When using NuGet 3.x this package requires at least version 3.4.

The entire lifecycle of System.ObjectModel

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