Error CS0122: '{0}' is inaccessible due to its protection level

[rezanid]

Actual behavior

Build error for any type generated by CsWin32, if a referenced assembly also contains the type as internal! Example error:

• error CS0122: 'HRESULT' is inaccessible due to its protection level.

Expected behavior

When using any type from CsWin32 that is generated into the local assembly - even if the type also exist in a referenced assembly - I am expecting the generated type to be used.

Repro steps

1. NativeMethods.txt content:

use pointers.
COLORREF
IsZoomed
DefWindowProc
SetWindowPos
GetWindowRect
PostMessage
DwmSetWindowAttribute
SHAppBarMessage
S_OK
E_INVALIDARG
HRESULT_FROM_WIN32
MAKELONG
LOWORD
HIWORD

2. NativeMethods.json content (if present): Not present

3. Any of your own code that should be shared?

Context

• CsWin32 version: 0.3.269+368685089b.RR
• Win32Metadata version (if explicitly set by project):
• Target Framework: net48
• LangVersion (if explicitly set by project): 13.0
• OS: Win11 ARM

The repo can be found below:

Note

I suggest downloading this single project (not the entire solution) to easily build:

https://github.com/rezanid/xrmtools/blob/vsix-hybrid/src/XrmTools.Shell/XrmTools.Shell.csproj

Additional Context

I also tried building outside Visual Studio using dotnet build. This command successfully builds the project. Then I added the following piece to the project and tested again. This time also dotnet build fails similarly.

  <PropertyGroup>
    <CsWin32RunAsBuildTask>true</CsWin32RunAsBuildTask>
  </PropertyGroup>

I guess the source generator has logic to detect if the type already exists, but it does not distinguish between type exist in the current assembly or a referenced one or this logic doesn't work when directly building with MSBuild and only via dotnet build.