microsoft/CsWin32

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A source generator to add a user-defined set of Win32 P/Invoke methods and supporting types to a C# project.

Stars: 2.5k
Forks: 124
Open beginner issues: 0
Indexed issues: 118
Avg merge: 1d 3h
Merged PRs (30d): 9

Dominant language: C#
License: MIT
Last GitHub push: Sep 17, 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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118 open issues indexed

Exclude Foundation.Metadata From NativeMethods.txt To Prevent Stack Overflows Open

bug

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

microsoft/CsWin32#1818 · Opened Sep 10, 2026
IVssBackupComponents is not generated correctly Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 70/100

microsoft/CsWin32#1798 · Opened Aug 24, 2026
GameInputKind enum should use simplified name. Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 64/100

microsoft/CsWin32#1792 · 2 comments · Opened Aug 21, 2026
`MOUSE_STATE` enum does not have a `[Flags]` attribute Open

bug

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

microsoft/CsWin32#1741 · 1 comment · Opened Jul 3, 2026
Improve source generation both for Roslyn-based and for BT-based SG Open

Difficulty 5/5 Over a week Newbie friendliness 45/100

microsoft/CsWin32#1732 · Opened Jun 13, 2026
CM_Locate_DevNode does not generate friendly overload Open

bug

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

microsoft/CsWin32#1710 · 1 comment · Opened Jun 2, 2026
Stack overflow when trying to process ICoreWebView2 within Microsoft.Web.WebView2.Core. Open

bug

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

microsoft/CsWin32#1695 · 6 comments · Opened May 14, 2026
Class Factor Source Generator Open

enhancement

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

microsoft/CsWin32#1691 · 1 reaction · Opened May 5, 2026
CreateBitmapFromDxgiSurface uses D2D1_BITMAP_PROPERTIES1_unmanaged even though D2D1_BITMAP_PROPERTIES1 already has the same layout Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 58/100

microsoft/CsWin32#1682 · Opened Apr 25, 2026
`System.Runtime.InteropServices.ComTypes.IDataObject` vs `Windows.Win32.System.Com.IDataObject` Open

enhancement

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

microsoft/CsWin32#1673 · Opened Apr 5, 2026
Error CS0122: '{0}' is inaccessible due to its protection level Open

bug

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

microsoft/CsWin32#1671 · Opened Apr 3, 2026
ACTIVATE_KEYBOARD_LAYOUT_FLAGS enum does not have a [Flags] attribute Open

bug

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

microsoft/CsWin32#1664 · Opened Mar 14, 2026
The friendly overload for `RtlInitUnicodeString()` looks incredibly dangerous. Open

bug

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

microsoft/CsWin32#1662 · 2 comments · Opened Mar 9, 2026
`IURL_INVOKECOMMAND_FLAGS` doesn't have `[Flags]` specified. Open

bug

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

microsoft/CsWin32#1661 · 1 comment · Opened Mar 8, 2026
Add explicit nint cast operator to `PWSTR`. Open

enhancement

Difficulty 1/5 Under an hour Newbie friendliness 68/100

microsoft/CsWin32#1660 · Opened Mar 4, 2026
Add `IsNull` property to `PWSTR` types. Open

enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 55/100

microsoft/CsWin32#1659 · Opened Mar 4, 2026
Compiler warnings CS1574 and CS1580 appear in generated code on `<inheritdoc cref="x" />` Open

enhancement

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

microsoft/CsWin32#1658 · Opened Mar 4, 2026
`MsiGetSummaryInformation()` and `MsiViewExecute()` should accept null for `hDatabase`/`hView`, respectively. Open

bug

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

microsoft/CsWin32#1656 · Opened Feb 25, 2026
Friendly overload for `MsiDatabaseOpenView()` is not appropriate Open

bug

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

microsoft/CsWin32#1655 · 1 comment · Opened Feb 25, 2026
Possible issue with `VS_FIXEDFILEINFO` generation/projection. Open

bug

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

microsoft/CsWin32#1653 · Opened Feb 20, 2026
Support `public`/`internal` scoping on a per NativeMethod basis. Open

enhancement

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

microsoft/CsWin32#1652 · Opened Feb 20, 2026
Improve .NET Framework `Span<T>`/`ReadOnlySpan<T>` generation Open

enhancement

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

microsoft/CsWin32#1651 · 1 comment · Opened Feb 18, 2026
Consider adding `RS0030` to the current CsWin32 suppressions list Open

enhancement

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

microsoft/CsWin32#1650 · Opened Feb 17, 2026
Add `HWND.INVALID_HANDLE_VALUE` into emitted output. Open

enhancement

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

microsoft/CsWin32#1649 · Opened Feb 17, 2026
Improve friendly overloads when buffers are involved Open

enhancement

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

microsoft/CsWin32#1645 · 2 comments · Opened Feb 11, 2026
Provide error code to .NET exception mapping Open

enhancement

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

microsoft/CsWin32#1644 · 3 comments · Opened Feb 11, 2026
NTSTATUS and HRESULT projected as struct instead of enum Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 32/100

microsoft/CsWin32#1643 · 1 reaction · Opened Feb 11, 2026
Incorrect return type of RtlNtStatusToDosError Open

bug

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

microsoft/CsWin32#1642 · 1 comment · Opened Feb 11, 2026
Improved Unicode string marshaling Open

enhancement

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

microsoft/CsWin32#1641 · 1 reaction · Opened Feb 11, 2026
CsWin32 can generate better friendly overload when optional native arrays are involved Open

enhancement

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

microsoft/CsWin32#1640 · Opened Feb 9, 2026
Implement IEqualityOperators for autotypes Open

enhancement

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

microsoft/CsWin32#1639 · Opened Feb 8, 2026
Add CreateDelegatePointer for PROC and FARPROC Open

enhancement

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

microsoft/CsWin32#1638 · 2 comments · Opened Feb 8, 2026
PInvoke.FindFirstFileExFromApp does not set last error code Open

bug

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

microsoft/CsWin32#1636 · Opened Feb 5, 2026
IPortableDevice types being generated with in keywords Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 55/100

microsoft/CsWin32#1635 · Opened Feb 2, 2026
Something wrong with 3rd part document generate Open

bug

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

microsoft/CsWin32#1634 · Opened Feb 2, 2026
The generated Marshaller has mistaken namespace Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 38/100

microsoft/CsWin32#1632 · 1 comment · Opened Jan 30, 2026
Can't use PowerRegisterSuspendResumeNotification with DEVICE_NOTIFY_CALLBACK Open

bug

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

microsoft/CsWin32#1631 · Opened Jan 29, 2026
Suggestion: support C# collection expressions for creating `VariableLengthInlineArray`s Open

enhancement

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

microsoft/CsWin32#1630 · Opened Jan 28, 2026
Useless unmanaged warpers generated when has delegate pointers Open

bug

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

microsoft/CsWin32#1629 · 1 comment · Opened Jan 26, 2026
Allow UserDirectories in DefaultDllImportSearchPaths for AppLocalAllowedLibraries Open

enhancement

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

microsoft/CsWin32#1628 · Opened Jan 26, 2026
Mistakes generate winmdroot when Windows.Win32 not generated Open

bug

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

microsoft/CsWin32#1627 · 2 comments · Opened Jan 25, 2026
DECIMAL to decimal conversion Open

bug

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

microsoft/CsWin32#1626 · Opened Jan 23, 2026
.net framework style project support broken? Open

bug

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

microsoft/CsWin32#1625 · 5 comments · Opened Jan 23, 2026
Add macros from wingdi.h (e.g. RGB, GetRValue) Open

enhancement

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

microsoft/CsWin32#1619 · 1 comment · 1 reaction · Opened Jan 16, 2026
The P/Invoke `GetWindowThreadProcessId()` doesn't have `SetLastError = true`. Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 50/100

microsoft/CsWin32#1618 · Opened Jan 15, 2026
CsWin32 seems to be unable to generate `RasDial` Open

bug

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

microsoft/CsWin32#1617 · 3 comments · Opened Jan 15, 2026
The friendly wrapper for `NetFreeAadJoinInformation()` is pointless. Open

bug

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

microsoft/CsWin32#1616 · Opened Jan 15, 2026
The P/Invoke `NetGetAadJoinInformation()` doesn't generate a SafeHandle overload. Open

bug

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

microsoft/CsWin32#1615 · Opened Jan 15, 2026
Provide custom file header option for compatibility with BannedApiAnalyzer Open

enhancement

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

microsoft/CsWin32#1611 · 4 comments · Opened Jan 9, 2026
CS1591 Warning occurring when making generated types `public` Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 42/100

microsoft/CsWin32#1609 · 2 comments · Opened Jan 4, 2026

microsoft/CsWin32

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