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razzmatazz/csharp-language-server

This system is a C# language server that provides IDE-like features such as code completion, diagnostics, and formatting. It integrates with the Roslyn compiler and analyzers to offer real-time code analysis and error reporting. The server manages workspace state and communicates with clients via the LSP protocol, supporting modern .NET development practices.

56.2

Adequate · 20 July 2026

23k

lines of production code

F#

primary language

1

bus factor · 25 authors in all

2

measurements over time

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How it got here

2020 · .NET 10 and Roslyn 5.6.0 upgrade

The project underwent a comprehensive modernization of its build infrastructure and architecture, targeting .NET 10 and Roslyn 5.6.0. This period focused on replacing the custom LSP implementation with the Ionide.LanguageServerProtocol library and standardizing the repository structure for improved developer experience and test isolation.

3 changes

2024 · C# language server implementation

This period focused on implementing the core infrastructure for a C# language server, introducing new handlers for LSP features like completion and diagnostics. The work established the underlying client, server, and workspace abstractions to manage communication and state, supported by comprehensive test coverage.

3 changes

2025–2026 · C# language server architecture and feature expansion

The project focused on significantly expanding the C# language server's capabilities by integrating Roslyn analyzer diagnostics and supporting LSP 3.17.0 features like type hierarchy and notebook documents. This was supported by a comprehensive overhaul of the server's runtime architecture, introducing dedicated modules for request scheduling, diagnostics, and debug information, alongside extensive test coverage for various C# and ASP.NET scenarios.

6 changes

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About this page

  • The description of this project is derived from its own commit history, not from its README.
  • The score is its highest published measurement, taken on 20 July 2026 at a pinned commit. It is not a live figure and does not change until the project is measured again.
  • Measured at commit b714e27ca7 — the exact code this score is about.
  • Scored under rubric rubric-2026.08.17. Score the same commit under that rubric and you get the same number.
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