PInvoke006: An error occurred while reading docs file

[0xced]

Actual behavior

Warning PInvoke006 occurs when using the latest compiler toolset (i.e. Microsoft.Net.Compilers.Toolset 4.6.0).

Expected behavior

No warning is produced.

Repro steps

1. MyProject.csproj content:

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>net6.0</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.Net.Compilers.Toolset" Version="4.6.0" PrivateAssets="all" />
    <PackageReference Include="Microsoft.Windows.CsWin32" Version="0.3.2-beta" PrivateAssets="all" />
  </ItemGroup>

</Project>

2. NativeMethods.txt content: (an empty file is enough to trigger the warning)

dotnet build produces the following warning:

CSC : warning PInvoke006: An error occurred while reading docs file: "%USERPROFILE%\.nuget\packages\microsoft.windows.sdk.win32docs\0.1.41-alpha\ buildTransitive..\apidocs.msgpack": Failed to deserialize System.Collections.Generic.Dictionary`2[[System.String, System.Private.CoreLib, Version=6 .0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[Microsoft.Windows.SDK.Win32Docs.ApiDetails, Microsoft.Windows.SDK.Win32Docs, Version=0.1. 41.51634, Culture=neutral, PublicKeyToken=7c40c7c34b1fcfe1]] value. [C:\MyProject\MyProject.csproj]

Context

• CsWin32 version: 0.3.2-beta
• Win32Metadata version: not set explicitly
• Target Framework: net6.0
• LangVersion: not set explicitly

Additional info

The warning does not occur when using Microsoft.Net.Compilers.Toolset version 4.5.0.

[AArnott]

I can repro it as you say, when I use dotnet build. Thank you for this report.

[AArnott]

@sharwell do you have any guesses as to what breaking change may have occurred in Roslyn between the 4.5.0 and 4.6.0 versions?

[alexrp]

I've started running into this as well, in a .NET 8 RC 1 project. Oddly, it only appears in VS Code, not with dotnet build... 🤔