A Neovim configuration using lazy.nvim (no Mason required).

• Neovim >= 0.11.0
• .NET SDK installed
• ripgrep, fd-find, git, make, unzip

This section documents how to set up the Roslyn language server for C# development.

Add to your lazy.nvim config:

{
  'seblyng/roslyn.nvim',
  ft = 'cs',
  opts = {},
}

Download the Roslyn language server for your platform:

• macOS (Intel): osx-x64
• macOS (Apple Silicon): osx-arm64
• Linux: linux-x64
• Windows: win-x64

Download URL:

https://dev.azure.com/azure-public/vside/_artifacts/feed/vs-impl/NuGet/Microsoft.CodeAnalysis.LanguageServer.<platform>/overview

# Create roslyn directory
mkdir -p ~/.local/share/nvim/roslyn

# Extract the nupkg (it's a zip file)
unzip Microsoft.CodeAnalysis.LanguageServer.osx-arm64.x.x.x.nupkg -d ~/.local/share/nvim/roslyn

Create ~/.local/bin/roslyn (ensure ~/.local/bin is in your PATH):

#!/bin/bash
exec "/Users/personal/.local/share/nvim/roslyn/content/LanguageServer/osx-arm64/Microsoft.CodeAnalysis.LanguageServer" "$@"

chmod +x ~/.local/bin/roslyn

If macOS blocks the executable:

xattr -rd com.apple.quarantine ~/.local/share/nvim/roslyn/content/LanguageServer/osx-arm64/Microsoft.CodeAnalysis.LanguageServer

roslyn --help

Open a .cs file and the LSP should attach automatically.

This section documents how to set up debugging for .NET Core C# projects using nvim-dap.

macOS arm64 (Apple Silicon) - MUST BUILD FROM SOURCE:

The official releases only include x86_64 binaries, which don't work properly with nvim-dap on Apple Silicon. You must compile from source:

# Prerequisites (if not already installed)
# brew install cmake ninja

# Clone and build
mkdir -p ~/.local/src
cd ~/.local/src
git clone --depth 1 https://github.com/Samsung/netcoredbg.git
cd netcoredbg
mkdir build && cd build
CC=clang CXX=clang++ cmake ..
make -j$(sysctl -n hw.ncpu)
sudo make install

This installs to /usr/local/netcoredbg.

macOS Intel (x86_64) or Linux:

Download the prebuilt binary:

# Download the debugger
curl -L -o ~/Downloads/netcoredbg.tar.gz "https://github.com/Samsung/netcoredbg/releases/download/3.1.3-1062/netcoredbg-osx-amd64.tar.gz"

# Extract to ~/.local/bin
tar -xzf ~/Downloads/netcoredbg.tar.gz -C ~/Downloads/
mkdir -p ~/.local/bin
cp ~/Downloads/netcoredbg/netcoredbg ~/.local/bin/
chmod +x ~/.local/bin/netcoredbg

# Verify
~/.local/bin/netcoredbg --version

The adapter is configured in after/plugin/dap-cs.lua. Update the path if needed:

M.netcoredbg_path = '/usr/local/netcoredbg'  -- macOS arm64 (built from source)
-- or
M.netcoredbg_path = '/Users/<username>/.local/bin/netcoredbg'  -- prebuilt

The dap plugins will be installed automatically via lazy.nvim.

1. Open your .NET project in Neovim
2. Build your project: dotnet build
3. Press <leader>dll to auto-detect and launch your project, or <leader>dc for manual selection
4. The DAP UI will open showing breakpoints, variables, stack, and watch windows

• lazydev.nvim - Lua LSP configuration
• fidget.nvim - LSP status updates
• blink.cmp - Completion
• telescope.nvim - Fuzzy finder
• treesitter - Syntax highlighting
• nvim-surround - Surround selections
• gitsigns.nvim - Git integration
• snacks.nvim - UI enhancements
• roslyn.nvim - C# LSP
• nvim-dap - Debug adapter protocol
• nvim-dap-ui - Debugging UI