Cysharp/ObservableCollections

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High performance observable collections and synchronized views, for WPF, Blazor, Unity.

Stars: 1k
Forks: 73
Open beginner issues: 0
Indexed issues: 13
Avg merge: 5d 4h
Merged PRs (30d): 2

Dominant language: C#
License: MIT
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 20, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

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13 open issues indexed

Avoid assuming List<T>'s private field layout via Unsafe.As (ListView/LegacyListView) Open

Cysharp/ObservableCollections#136 · 1 assignee · Opened Sep 17, 2026
ObserveCountChanged: a count change during Subscribe is silently dropped — the handler is attached before countPrev is initialized Open

Difficulty 3/5 1-2 days Newbie friendliness 76/100

Cysharp/ObservableCollections#132 · Opened Sep 14, 2026
Reject collection modification from inside a `CollectionChanged` handler: reentrancy invalidates the event args for the other subscribers Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

Cysharp/ObservableCollections#131 · Opened Sep 14, 2026
Update TargetFrameworks: add net10.0 now, drop net6.0/net8.0 after November 2026 Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

Cysharp/ObservableCollections#128 · Opened Sep 10, 2026
`ObservableStack<T>.CreateView` reverses the order of a non-empty source, then desyncs on `Pop` Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

Cysharp/ObservableCollections#126 · Opened Sep 1, 2026
In .NET Framework, ObservableList.CreateView does not update with new items when they are added to the ObservableList. Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

Cysharp/ObservableCollections#123 · 1 comment · Opened Jun 4, 2026
ObserveCountChanged misses count if observer has side effect Open

Difficulty 3/5 1-2 days Newbie friendliness 65/100

Cysharp/ObservableCollections#120 · Opened Apr 17, 2026
ObservableList with View causes duplication of Move notification Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

Cysharp/ObservableCollections#118 · 1 comment · Opened Apr 17, 2026
Data parameter in CreateView Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

Cysharp/ObservableCollections#117 · Opened Apr 7, 2026
SynchronizedViewList throws on ToList() / when used as IEnumerable Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

Cysharp/ObservableCollections#116 · Opened Apr 2, 2026
App crashes on rapid async updates when using ToNotifyCollectionChanged with WinUI 3 ListView Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

Cysharp/ObservableCollections#115 · Opened Apr 1, 2026
SynchronizedView with TView parameters only Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

Cysharp/ObservableCollections#112 · 1 comment · Opened Jan 27, 2026
Clear method prevents collections of IDisposable items. Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

Cysharp/ObservableCollections#99 · 5 comments · 4 reactions · Opened Apr 17, 2025

Cysharp/ObservableCollections

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