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Known WinRT.SourceGenerator and CsWinRT issues
#1809 · manodasanW opened on Oct 4, 2024
9
Collection expression plan for AOT support
#1877 · Sergio0694 opened on Nov 23, 2024
2

Bug: Can't use data template selector if items are unions
Bug
microsoft/CsWinRT#2611 · opened on Oct 17, 2026
Bug: UWP AOT publish + CsWinRT 2.3.1 => app freezes when NavigationView is used
Bug
microsoft/CsWinRT#2609 · opened on Oct 17, 2026
AOT source generator misses boxed types in expression-bodied methods and coalesce expressions
microsoft/CsWinRT#2598 · opened on Oct 8, 2026
Bug: cswinrt: unsynchronized static cache in find_fast_abi_class_type is accessed from parallel namespace tasks
Bug
microsoft/CsWinRT#2596 · opened on Oct 1, 2026
Bug: cswinrt: float/double custom attribute arguments are emitted as the letter "f"
Bug
microsoft/CsWinRT#2595 · opened on Oct 1, 2026
Bug: 1000 bytes of GC memory pressure per IObjectReference makes per-frame event-args wrappers induce periodic gen2 collections on a small managed heap
Bug
microsoft/CsWinRT#2594 · opened on Sep 30, 2026
1
Bug: AOT optimizer source generator output depends on hash order, so WinUI builds are not deterministic
microsoft/CsWinRT#2562 · opened on Sep 12, 2026
WinRT.Host misidentifies standard casing and probes outside its directory
microsoft/CsWinRT#2550 · opened on Sep 7, 2026
Bug: memory access violation after cross-arch NAOT compilation
Bug
microsoft/CsWinRT#2546 · opened on Sep 3, 2026
Bug: Something is wrong with WinRT.Marshaler in WinRT 2.3.1
Bug
microsoft/CsWinRT#2542 · opened on Aug 30, 2026
9
AOT optimizer emits unqualified generic type arguments in GlobalVtableLookup, so the entries never match Type.ToString()
microsoft/CsWinRT#2536 · opened on Aug 26, 2026
2
ObjectReferenceWithContext.Release() dispatched into an apartment that is uninitializing, faulting inside the callee
microsoft/CsWinRT#2532 · opened on Aug 23, 2026
5
Bug: Using a non-reentrant wait synchronization context causes app to hang on exit
Bug
microsoft/CsWinRT#2531 · opened on Aug 21, 2026
Proposal: Add LongPathAware support to cswinrt.exe
Feature
microsoft/CsWinRT#2528 · opened on Aug 19, 2026
UWP: static XAML events subscribed from a secondary CoreApplication view are invoked on the first subscriber's thread
microsoft/CsWinRT#2524 · opened on Aug 14, 2026
1
Proposal: Add XamlGeneratedMain entry point for Windows.UI.Xaml(Modern .NET)
Feature
microsoft/CsWinRT#2522 · opened on Aug 14, 2026
Bug: Can't bind to ImmutableArray when using Native AOT
Bug
microsoft/CsWinRT#2507 · opened on Aug 1, 2026
Bug: CsWinRT only projects one instance of repeated WinRT attributes
Bug
microsoft/CsWinRT#2491 · opened on Jul 26, 2026
Bug: CsWinRT 3 undetermined-interface case relies on undefined COM behavior
Bug
microsoft/CsWinRT#2483 · opened on Jul 7, 2026
Set DisableRuntimeMarshalling and IsAotCompatible defaults via package .targets instead of emitting them in generated source
microsoft/CsWinRT#2463 · opened on Jun 21, 2026
Bug: [CSWinRT 3]: Crash when project is built as a NativeAOT library
Bug
microsoft/CsWinRT#2441 · opened on Jun 15, 2026
2
Bug: Reentracy checks conflict with .Net synchronization mechanisms (e.g. lock), causing random crashes in apps
Bug
microsoft/CsWinRT#2422 · opened on May 25, 2026
3
Proposal: Use Span for WindowsRuntimeBufferMarshal.TryGetDataUnsafe
Feature
microsoft/CsWinRT#2416 · opened on May 7, 2026
2
It is hoped that the Microsoft.Windows.SDK.NET.Ref package suitable for the 28000 SDK can be provided.
Feature
microsoft/CsWinRT#2414 · opened on May 1, 2026
[CsWinRT 3] ICustomPropertyProvider is not added to all CCWs
microsoft/CsWinRT#2386 · opened on Apr 10, 2026
10

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Issues

Issues

Bug: Can't use data template selector if items are unions

Bug: UWP AOT publish + CsWinRT 2.3.1 => app freezes when NavigationView is used

AOT source generator misses boxed types in expression-bodied methods and coalesce expressions

Bug: cswinrt: unsynchronized static cache in find_fast_abi_class_type is accessed from parallel namespace tasks

Bug: cswinrt: float/double custom attribute arguments are emitted as the letter "f"

Bug: 1000 bytes of GC memory pressure per IObjectReference makes per-frame event-args wrappers induce periodic gen2 collections on a small managed heap

Bug: AOT optimizer source generator output depends on hash order, so WinUI builds are not deterministic

WinRT.Host misidentifies standard casing and probes outside its directory

Bug: memory access violation after cross-arch NAOT compilation

Bug: Something is wrong with WinRT.Marshaler in WinRT 2.3.1

AOT optimizer emits unqualified generic type arguments in GlobalVtableLookup, so the entries never match Type.ToString()

ObjectReferenceWithContext.Release() dispatched into an apartment that is uninitializing, faulting inside the callee

Bug: Using a non-reentrant wait synchronization context causes app to hang on exit

Proposal: Add LongPathAware support to cswinrt.exe

UWP: static XAML events subscribed from a secondary CoreApplication view are invoked on the first subscriber's thread

Proposal: Add XamlGeneratedMain entry point for Windows.UI.Xaml(Modern .NET)

Bug: Can't bind to ImmutableArray when using Native AOT

Bug: CsWinRT only projects one instance of repeated WinRT attributes

Bug: CsWinRT 3 undetermined-interface case relies on undefined COM behavior

Set DisableRuntimeMarshalling and IsAotCompatible defaults via package .targets instead of emitting them in generated source

Bug: [CSWinRT 3]: Crash when project is built as a NativeAOT library

Bug: Reentracy checks conflict with .Net synchronization mechanisms (e.g. lock), causing random crashes in apps

Proposal: Use `Span` for `WindowsRuntimeBufferMarshal.TryGetDataUnsafe`

It is hoped that the Microsoft.Windows.SDK.NET.Ref package suitable for the 28000 SDK can be provided.

[CsWinRT 3] ICustomPropertyProvider is not added to all CCWs