C# for Visual Studio Code (powered by OmniSharp)

Master	Release

Welcome to the C# extension for Visual Studio Code! This extension provides the following features inside VS Code:

• Lightweight development tools for .NET Core.
• Great C# editing support, including Syntax Highlighting, IntelliSense, Go to Definition, Find All References, etc.
• Debugging support for .NET Core (CoreCLR). NOTE: Mono debugging is not supported. Desktop CLR debugging has limited support.
• Support for project.json and csproj projects on Windows, macOS and Linux.

The C# extension is powered by OmniSharp.

Get Started Writing C# in VS Code

• Documentation
• Video Tutorial compiling with .NET Core

What's new in 1.22.0

• Add setting for enabling go to decompilation (PR: #3774)
• Add experimental Semantic Highlighter csharp.semanticHighlighting.enabled (#3565, PR: #3667
• Add commands for Run and Debug Tests in Context (PR: #3772, PR: omnisharp-roslyn/#1782)
• Do not add references CodeLens to Dispose methods (#3243, PR: #3780)
• Add Visual Studio 2019 themes with semantic colors (PR: #3790)
• Added support for WarningsAsErrors in csproj files (PR: omnisharp-roslyn/#1779)
• Added support for WarningsNotAsErrors in csproj files (omnisharp-roslyn/#1681, PR: #1784)
• Improved MSBuild scoring system (omnisharp-roslyn/#1783, PR: omnisharp-roslyn/#1797)
• Updated OmniSharp.Extensions.LanguageServer to 0.14.2 to fix synchronisation (PR: omnisharp-roslyn/#1791)
• Add test discovery and NoBuild option to test requests (PR: omnisharp-roslyn/#1719)
• Updated Razor support
  • Enable Semantic Highlighting for Razor TagHelpers and Blazor components (aspnetcore#21713)
• Add support for Blazor WebAssembly-specific debug adapter (dotnet/aspnetcore-tooling#1885)

What's new in 1.21.18

• Fadeout unused variable names (#1324, PR: #3733)
• Updated debugger (PR: #3729)
• Fixed not supported exception when trying to decompile a BCL assembly on Mono. For now we do not try to resolve implementation assembly from a ref assembly (PR: omnisharp-roslyn/#1767)
• Added support for generic classes in test runner (#3722, PR: omnisharp-roslyn/#1768)
• Improved autocompletion performance (PR: omnisharp-roslyn/#1761)
• Move to Roslyn's .editorconfig support (omnisharp-roslyn/#1657, PR: omnisharp-roslyn/#1771)
• Fully update CompilationOptions when project files change (PR: omnisharp-roslyn/#1774)

What's new in 1.21.17

• Updated Razor support (PR:#3696)
• Razor support for <text> tag completions.
• Ability to restart the Razor Language Server to activate changes to the razor.trace level.
• Bug fixes and performance improvements.
• Support for <RunAnalyzers /> and <RunAnalyzersDuringLiveAnalysis /> (PR: omnisharp-roslyn/#1739)
• Add typeparam documentation comments to text description (#3516, PR: omnisharp-roslyn/#1749)
• Tag #region blocks appropriately in the block structure service (#2621, PR: omnisharp-roslyn/#1748)

Emmet support in Razor files

To enable emmet support, add the following to your settings.json:

"emmet.includeLanguages": {
    "aspnetcorerazor": "html"
}

Semantic Highlighting

The C# semantic highlighting support is in preview. To enable, set editor.semanticHighlighting.enabled and csharp.semanticHighlighting.enabled to true in your settings. Semantic highlighting is only provided for code files that are part of the active project.

To really see the difference, try the new Visual Studio 2019 Light and Dark themes with semantic colors that closely match Visual Studio 2019.

Supported Operating Systems for Debugging

• Currently, the C# debugger officially supports the following operating systems:

  • X64 operating systems:
    • Windows 7 SP1 and newer
    • macOS 10.12 (Sierra) and newer
    • Linux: see .NET Core documentation for the list of supported distributions. Note that other Linux distributions will likely work as well as long as they include glibc and OpenSSL.
  • ARM operating systems:
    • Linux is supported as a remote debugging target

Found a Bug?

To file a new issue to include all the related config information directly from vscode by entering the command pallette with Ctrl+Shift+P (Cmd+Shift+P on macOS) and running CSharp: Report an issue command. This will open a browser window with all the necessary information related to the installed extensions, dotnet version, mono version, etc. Enter all the remaining information and hit submit. More information can be found on the wiki.

Alternatively you could visit https://github.com/OmniSharp/omnisharp-vscode/issues and file a new one.

Development

First install:

• Node.js (8.11.1 or later)
• Npm (5.6.0 or later)

To run and develop do the following:

• Run npm i
• Run npm run compile
• Open in Visual Studio Code (code .)
• Optional: run npm run watch, make code changes
• Press F5 to debug

To test do the following: npm run test or F5 in VS Code with the "Launch Tests" debug configuration.

License

Copyright © .NET Foundation, and contributors.

The Microsoft C# extension is subject to these license terms. The source code to this extension is available on https://github.com/OmniSharp/omnisharp-vscode and licensed under the MIT license.

Code of Conduct

This project has adopted the code of conduct defined by the Contributor Covenant to clarify expected behavior in our community. For more information see the .NET Foundation Code of Conduct.

Contribution License Agreement

By signing the CLA, the community is free to use your contribution to .NET Foundation projects.

.NET Foundation

This project is supported by the .NET Foundation.