.NET Core - ArchWiki

# .NET Core

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.NET Core is a new FOSS software framework from Microsoft for C#, Visual Basic, and F#. It is designed to be cross-platform, modular and apt for modern applications, as opposed to its predecessor, the .NET Framework.

## Installation

If you only want to run .NET Core managed applications, install the dotnet-runtime package.

To build apps with .NET Core, install dotnet-sdk as well.

Microsoft recommends using Visual Studio Code , their Electron-based FOSS IDE, to build & debug .NET Core apps.

Tip: Add `~/.dotnet/tools` to `PATH`, otherwise dotnet tools with not work from shell.

## Telemetry

Telemetry is enabled by default but can be disabled by setting environment variable `DOTNET_CLI_TELEMETRY_OPTOUT=1`.

## Troubleshooting

### "the required library libhostfxr.so could not be found" error

Some of the dotnet SDK tools (for example libman, dotnet-watch etc.) may expect you to have the environment variable `DOTNET_ROOT` pre-configured. If it's not, an error like this one could be observed: [1]

    A fatal error occurred, the required library libhostfxr.so could not be found.
    If this is a self-contained application, that library should exist in [/home/my_user/.dotnet/tools/.store/microsoft.web.librarymanager.cli/1.0.172/microsoft.web.librarymanager.cli/1.0.172/tools/netcoreapp2.1/any/].
    If this is a framework-dependent application, install the runtime in the default location [/usr/share/dotnet] or use the DOTNET_ROOT environment variable to specify the runtime location.

The workaround is to manually export `DOTNET_ROOT` in your shell:

    ~/.bashrc

    export DOTNET_ROOT=/opt/dotnet

### SDK specified could not be found

This is believed to caused by a conflict between the Mono and MSBuild SDK libs and the dotnet core ones. To fix this export the path manually in your shell (replacing the version number as necessary) e.g:

    ~/.bashrc

    export MSBuildSDKsPath="/opt/dotnet/sdk/2.2.108/Sdks/";

## See also

- .NET Core homepage
- The .NET Foundation
- .NET API Browser

Category:

- Frameworks