Migrates MSBuild P/Invoke code from DllImport to source-generated CsWin32 calls.
npx skills add https://github.com/dotnet/dotnet --skill cswin32-interop
Please help me install this Agent Skill. Skill: cswin32-interop Source: https://github.com/dotnet/dotnet/tree/main/src/msbuild/.github/skills/cswin32-interop Command: npx skills add https://github.com/dotnet/dotnet --skill cswin32-interop
Migrating MSBuild's Windows interop code from hand-written [DllImport] declarations to CsWin32 source-generated PInvoke.* calls involves many subtle rules: blittable signatures, FEATURE_WINDOWSINTEROP gating, error-handling parity, and source-build compatibility. This Skill encodes those rules so migrations stay correct and CI-clean.
[DllImport] declarations and hand-written structs/enums/constants with CsWin32-generated PInvoke.* calls and typed enums like HRESULT, HANDLE, and WIN32_ERROR.#if FEATURE_WINDOWSINTEROP plus runtime IsWindows checks correctly, and select the right guard for multi-TFM, net472-only, or .NET-only scenarios.DotNetBuildSourceOnly=true builds to catch IDE0005, IDE0051, CA1823, and CS1587 warnings treated as errors in CI.GetFileAttributesEx in MSBuild, use this Skill to generate the blittable CsWin32 call, preserve the original SetLastError/PreserveSig error contract, and verify the source build compiles cleanly.Migrate this [DllImport] declaration to CsWin32 PInvoke with proper FEATURE_WINDOWSINTEROP gating and error-handling parity.
High-intent search queries and answers about installing and using this skill.
Delete the [DllImport] declaration and hand-written structs, then call the source-generated PInvoke.* method directly using CsWin32 types like HANDLE and HRESULT. Add the API name to NativeMethods.txt so the generator emits it.
Wrap the code in #if FEATURE_WINDOWSINTEROP plus a runtime IsWindows check inside the block. Source builds define DotNetBuildSourceOnly=true, which disables the feature flag, so everything referenced only inside the guard must also be guarded.
Use CsWin32 for all Windows APIs. Reserve [LibraryImport] for non-Windows native calls such as libc, guarded with #if NET, since CsWin32 only generates Windows metadata-based bindings.
Using directives and private members referenced only inside #if FEATURE_WINDOWSINTEROP become unused when the flag is disabled in source builds, and CI treats warnings as errors. Guard those usings and members with the same #if, then verify with MSBuild.SourceBuild.slnf.
Check the original declaration for PreserveSig, SetLastError, BOOL, or HRESULT semantics and reproduce them: PreserveSig=false maps to .ThrowOnFailure(), and SetLastError with a failed BOOL maps to throwing Win32Exception. Silently returning where old code threw is a behavior change.
With allowMarshaling disabled, signatures cannot use managed types like string, StringBuilder, or arrays; use PCWSTR, PWSTR, T**, and void* instead. Return HRESULT rather than int, and prefer nint over IntPtr for native-sized integers.
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