A cross-platform C# editor and playground.

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We love LINQPad, but we also miss its tremendous utility when not working on Windows. This is an effort to develop an open-source, web-enabled, cross-platform alternative.

The goal isn't to reach 100% feature parity with LINQPad, but to offer an acceptable alternative that covers the features developers most commonly need, and if we're lucky, a few new useful ones!

NetPad is a C# playground. It is the quickest way to run some C# code without the ceremonies of creating and managing projects. As soon as you open NetPad you'll be presented with the editor right away. Write some C# code, hit Run and see your output. That's it.

• Prototyping and testing code before you incorporate it into your projects.
• Experiment with C# features that you haven't used before. NetPad is a great way to start learning C#.
• Query databases using LINQ or SQL.
• Create and save your own utility or administration scripts.
• Visualize Data in an interactive interface.

The following must be be installed to use NetPad:

• .NET SDK (v6 or greater)

Additional requirements only if you plan to create and use database connections:

• .NET 6 Runtime (not needed if .NET 6 SDK is installed)
• EF Core tools (.NET 5 or later)

Download the latest version for free!

For folks on Arch Linux or Manjaro, you can also install it from the AUR.

On macOS see this if you have trouble opening NetPad.

NetPad checks for updates on startup and will let you know when a new version is available. While it cannot yet install the latest update automatically, that feature will be introduced.

The latest version can be downloaded from the Releases page.

Maintenance of this project is made possible by all the contributors and sponsors. A special thanks to all of you!

If you like NetPad, please consider sponsoring it with a cup of coffee ($5) a month, every bit helps me maintain this project and deliver more features. Thank you ❤️

Join our new Discord server to collaborate with the community.

The Wiki is a great place to find more information about NetPad.

See the Troubleshooting section of the Wiki.

• The basics:
  • Write, save and run your own scripts
  • Manage namespaces
  • Standard code editor features powered by Monaco editor
  • Auto-open unsaved scripts from previous session on launch
• Dump complex objects to the results console and export results to Excel or HTML
• Choose the .NET SDK version you want to use per script
• Add and use database connections
• Run SQL queries
• Add NuGet packages
• Reference assemblies from disk
• Monaco Editor & OmniSharp offer an editor experience similar to Visual Studio Code:
  • Code Completion (Intellisense)
  • Semantic Highlighting
  • CodeLens
  • Inlay Hints
  • Hover for Documentation
  • Go-to implementation
  • Find References
  • Find Symbol
  • Rename Symbol
  • Action Suggestions
  • Diagnostics
  • Document Highlighting
  • Contextual code folding
  • Format document/selection/on-type

• Debugging
• Support for more database providers
• Hyperlink driven Lazy-loading of results, and a DataGrid view
• Benchmark your code
• Referencing other scripts
• View your code's Syntax Tree
• View your code as IL
• Export a script as a "ready to run" .NET app
• Export a script as a C# project
• Ability to run a script from the command-line
• Git tracking of script changes
• More advanced Dump() capabilities:
  • Dump HTML controls and interact with them
  • Dump images, SVGs, and bitmaps
  • Dump code with syntax highlighting
• Quality of Life:
  • User-defined results styling
  • Workspaces/Sessions
• Plugins & Theming

• .NET
• Electron.NET (github)
• Aurelia 2 (docs)

NetPad runs an ASP.NET web app that hosts a web-based user interface. It can be packaged as an Electron desktop app or served and accessed on any browser.

Communication between the user interface and the ASP.NET backend occurs via HTTP and SignalR.

This section describes how to build and run NetPad from source. NetPad can be run as an Electron desktop app or as a web application accessed with a web browser.

• Node v16+ (npm v8+)
• .NET SDK 7.x
• EF Core tools 5.x or later

# Install dependencies
cd src/Apps/NetPad.Apps.App/ElectronHostHook
npm install

cd ../App
npm install

# Start the development web server
npm start

Install the Electron.NET CLI tool:

dotnet tool install ElectronNET.CLI -g

Start the app:

cd src/Apps/NetPad.Apps.App

# Start in watch mode (remove '/watch' to run without watch mode)
electronize start /watch /manifest electron.manifest.dev.js

# For macOS ARM, append the following to the 'electronize start' command
/target custom "osx-arm64;mac" /electron-arch arm64

Only the very first electronize start is slow. Later runs are much faster.

# Install dependencies
cd Apps/NetPad.Apps.App/App
npm install

# Start the development web server
npm run start-web

cd Apps/NetPad.Apps.App
dotnet watch run --environment Development

and access the app via your web browser, ex: https://localhost:57930

The Electron app is built and packaged using electron-builder. Configuration is in the electron.manifest.js file.

Build the app for the desired platform from the root directory of the NetPad.Apps.App project:

# For x64:
electronize build /target win /manifest electron.manifest.js /PublishSingleFile false
electronize build /target osx /manifest electron.manifest.js /PublishSingleFile false
electronize build /target linux /manifest electron.manifest.js /PublishSingleFile false

# For macOS ARM:
electronize build /target custom "osx-arm64;mac" /electron-arch arm64 /manifest electron.manifest.js /PublishSingleFile false

Packaged files can be found in the bin/Desktop folder.

Alternatively, on Linux, the /scripts/package-electron.sh script can be used to package the Electron app, in which case packaged files can be found in the /dist/ folder.

See the Electron.NET docs for additional CLI options when packaging the app, and electron-builder for additional configuration options.

• Docs: Go
• More on SPA app startup and running tests: Go