microsoft/CsWinRT

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C# language projection for the Windows Runtime

Stars: 665
Forks: 134
Open beginner issues: 0
Indexed issues: 232
Avg merge: 1d 3h
Merged PRs (30d): 32

Dominant language: C#
License: MIT
Last GitHub push: Sep 15, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

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232 open issues indexed

Bug: Fails to build when project name starts with a number Open

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

microsoft/CsWinRT#2563 · Opened Sep 13, 2026
Bug: AOT optimizer source generator output depends on hash order, so WinUI builds are not deterministic Open

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

microsoft/CsWinRT#2562 · Opened Sep 12, 2026
WinRT.Host misidentifies standard casing and probes outside its directory Open

Difficulty 3/5 1-2 days Newbie friendliness 75/100

microsoft/CsWinRT#2550 · Opened Sep 7, 2026
Bug: memory access violation after cross-arch NAOT compilation Open

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

microsoft/CsWinRT#2546 · Opened Sep 3, 2026
Bug: Something is wrong with WinRT.Marshaler in WinRT 2.3.1 Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

microsoft/CsWinRT#2542 · 9 comments · Opened Aug 30, 2026
AOT optimizer emits unqualified generic type arguments in GlobalVtableLookup, so the entries never match Type.ToString() Open

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

microsoft/CsWinRT#2536 · 2 comments · Opened Aug 26, 2026
ObjectReferenceWithContext.Release() dispatched into an apartment that is uninitializing, faulting inside the callee Open

Difficulty 5/5 Over a week Newbie friendliness 28/100

microsoft/CsWinRT#2532 · 5 comments · Opened Aug 23, 2026
Bug: Using a non-reentrant wait synchronization context causes app to hang on exit Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

microsoft/CsWinRT#2531 · Opened Aug 21, 2026
Proposal: Add LongPathAware support to cswinrt.exe Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

microsoft/CsWinRT#2528 · Opened Aug 19, 2026
UWP: static XAML events subscribed from a secondary CoreApplication view are invoked on the first subscriber's thread Open

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

microsoft/CsWinRT#2524 · 1 comment · Opened Aug 14, 2026
Proposal: Add XamlGeneratedMain entry point for Windows.UI.Xaml(Modern .NET) Open

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

microsoft/CsWinRT#2522 · Opened Aug 14, 2026
Bug: Can't bind to ImmutableArray when using Native AOT Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

microsoft/CsWinRT#2507 · Opened Aug 1, 2026
Bug: CsWinRT only projects one instance of repeated WinRT attributes Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

microsoft/CsWinRT#2491 · Opened Jul 26, 2026
Bug: CsWinRT 3 undetermined-interface case relies on undefined COM behavior Open

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

microsoft/CsWinRT#2483 · Opened Jul 7, 2026
Set DisableRuntimeMarshalling and IsAotCompatible defaults via package .targets instead of emitting them in generated source Open

CsWinRT 3.0

Difficulty 4/5 3-5 days Newbie friendliness 58/100

microsoft/CsWinRT#2463 · Opened Jun 21, 2026
Bug: [CSWinRT 3]: Crash when project is built as a NativeAOT library Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

microsoft/CsWinRT#2441 · 2 comments · Opened Jun 15, 2026
Bug: Reentracy checks conflict with .Net synchronization mechanisms (e.g. lock), causing random crashes in apps Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

microsoft/CsWinRT#2422 · 3 comments · Opened May 25, 2026
Proposal: Use `Span` for `WindowsRuntimeBufferMarshal.TryGetDataUnsafe` Open

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

microsoft/CsWinRT#2416 · 2 comments · Opened May 7, 2026
It is hoped that the Microsoft.Windows.SDK.NET.Ref package suitable for the 28000 SDK can be provided. Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/CsWinRT#2414 · Opened May 1, 2026
[CsWinRT 3] ICustomPropertyProvider is not added to all CCWs Open

CsWinRT 3.0

Difficulty 5/5 Over a week Newbie friendliness 38/100

microsoft/CsWinRT#2386 · 10 comments · Opened Apr 10, 2026
Bug: InvalidCastException because failed to create a CCW in AOT for IAsyncOperation<> Open

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

microsoft/CsWinRT#2378 · 5 comments · 1 reaction · Opened Apr 1, 2026
CsWinRT3 Code IntelliSense is not working Open

CsWinRT 3.0 needs-author-feedback

Difficulty 4/5 3-5 days Newbie friendliness 42/100

microsoft/CsWinRT#2375 · 4 comments · Opened Mar 29, 2026
Bug: Trying to enumerate the result of DisplayArea.FindAll() throws an InvalidCastException Open

external

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

microsoft/CsWinRT#2373 · 2 comments · Opened Mar 27, 2026
Bug: Unexpected behavior of CollectionViewSource with grouping Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/CsWinRT#2304 · 3 comments · Opened Feb 27, 2026
Bug: SynchronizationContext is not set for secondary views in a UWP app Open

documentation

Difficulty 4/5 3-5 days Newbie friendliness 43/100

microsoft/CsWinRT#2288 · 4 comments · Opened Feb 23, 2026
Bug: can't pass struct arrays to WinRT methods Open

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

microsoft/CsWinRT#2287 · 1 comment · Opened Feb 23, 2026
APPX0702 when csproj reference vcxproj which output only winmd Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/CsWinRT#2180 · Opened Jan 16, 2026
Bug: Passing Microsoft.Graphics.Canvas.UI.Xaml.CanvasControl.Invalidate as the callback argument to a DispatcherQueue.TryEnqueue causes an InvalidCastException in the WinRT runtime Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

microsoft/CsWinRT#2171 · 1 comment · Opened Jan 3, 2026
Proposal: It is hoped that the ```CastExtensions.As<T>()``` extension method can be consistent with the ```.NET as``` keyword behavior Open

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

microsoft/CsWinRT#2148 · 1 comment · 1 reaction · Opened Dec 10, 2025
Bug: IReference<TypeName> mapped to Nullable<System.Type> causes compile error Open

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

microsoft/CsWinRT#2097 · Opened Nov 1, 2025
Bug: cswinrt uses wrong architecture runtime dll and will cause a runtime exception Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

microsoft/CsWinRT#2094 · 1 comment · Opened Oct 26, 2025
Bug: Empty Array is projected as null instead of an array of length 0 Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

microsoft/CsWinRT#2088 · 1 comment · Opened Oct 24, 2025
Bug: `CompositorController.CommitNeeded +=` is broken in .Net Framework Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

microsoft/CsWinRT#2065 · 4 comments · Opened Oct 1, 2025
Bug: Investigate CsWinRT component refencing NuGet package with lib and runtime assemblies Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

microsoft/CsWinRT#2052 · 2 comments · Opened Sep 12, 2025
Proposal: AsyncMethodBuilder for IAsyncAction and IAsyncOperation Open

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

microsoft/CsWinRT#2044 · 4 comments · 1 reaction · Opened Aug 28, 2025
Proposal: Automatically generate Fusion (SxS) manifests for referenced WinMDs' ACIDs Open

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

microsoft/CsWinRT#2031 · Opened Aug 9, 2025
Bug: args.Cue in NativeAOT-build has IInspectable type Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/CsWinRT#2024 · 14 comments · Opened Jul 25, 2025
Bug: COMException (0x80040154 - REGDB_E_CLASSNOTREG) after migrating NetProjectionSample to .NET 8.0 Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

microsoft/CsWinRT#2018 · 7 comments · Opened Jul 17, 2025
GetActivationFactory method doesn't exist in WindowsRuntimeMarshal class Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

microsoft/CsWinRT#2017 · 13 comments · Opened Jul 15, 2025
Bug: Copy Local (Private) not respected for project references Open

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

microsoft/CsWinRT#2015 · Opened Jul 14, 2025
Bug: Error messages are cleared and generic errors messages are passed through instead Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/CsWinRT#2006 · Opened Jun 17, 2025
Proposal: Generate GUID for projected runtimeclasses via attribute Open

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

microsoft/CsWinRT#2000 · Opened May 27, 2025
Add roadmap file with projected release dates Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

microsoft/CsWinRT#1997 · Opened May 25, 2025
Bug: Investigate ToImmutableList with IDIC Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/CsWinRT#1996 · Opened May 21, 2025
Bug: Factory and static methods are not propagating the experimental tag Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/CsWinRT#1993 · Opened May 19, 2025
Feature: CsWinRT resets activation factory if server restarts Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/CsWinRT#1990 · Opened May 15, 2025
MapChanged Event Raises Null args in WinUI 3 with ApplicationData.LocalSettings.Values Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/CsWinRT#1988 · Opened May 15, 2025
Bug: The Status property of WiFiDirectAdvertisementPublisher is not updated after the Publisher is initially started Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/CsWinRT#1987 · Opened May 13, 2025
Bug: Cannot launch folder pickers in LowIL mode (partial trust) Open

Difficulty 4/5 3-5 days Newbie friendliness 32/100

microsoft/CsWinRT#1986 · 4 comments · Opened May 6, 2025
Proposal: Support for contract versioning (and other WinRT attributes) on published WinRT interfaces Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/CsWinRT#1981 · Opened Apr 21, 2025

microsoft/CsWinRT

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