CSharp.Refactor for Visual Studio
A VSIX whose payload is the analyzer assembly with FSharp.Core beside it,
declared as a Microsoft.VisualStudio.Analyzer asset (the diagnostics, added
to every C# project VS opens) and a Microsoft.VisualStudio.MefComponent
asset (the code-fix provider). No package code, no sidecar: Roslyn renders
the squiggles and light bulbs. Verified on Visual Studio 2026 (18.10).
Build + try
powershell -File src/CSharp.Refactor.Vsix/CreateVsix.ps1
& "C:\Program Files\Microsoft Visual Studio\18\Professional\Common7\IDE\VSIXInstaller.exe" "/rootSuffix:Exp" src\CSharp.Refactor.Vsix\artifacts\CSharp.Refactor.vsix
& "C:\Program Files\Microsoft Visual Studio\18\Professional\Common7\IDE\devenv.exe" /rootSuffix Exp
Open any C# project and look for the three-dot suggestions; Ctrl+. on one
shows the fixes.
Packaging notes
A .vsix is an OPC zip assembled by hand in CreateVsix.ps1: payload,
extension.vsixmanifest (the source manifest with the design-time d:
namespace stripped), the v3 servicing files manifest.json and
catalog.json, and [Content_Types].xml. Every part's extension needs a
Default entry there — including the json of the servicing files, which
are written AFTER the payload is staged. Enumerate the payload again before
writing the content types, or the installer says "The file is not a valid
VSIX package" and nothing else.
