Configuring Arch Linux for Razor development

There is a packaging issue with Arch's dotnet-sdk package where the net46 Razor build tasks are missing from the Razor SDK. This file /usr/share/dotnet/sdk/5.0.104/Sdks/Microsoft.NET.Sdk.Razor/tasks/net46/Microsoft.NET.Sdk.Razor.Tasks.dll is missing from the package file listing. Projects build fine from the commandline when using dotnet build, because it looks for the net5 build tasks which are available. However, the C# extension relies on Mono to support .NET Full Framework projects and we require the Full Framework net46 build tasks which are missing.

This comment provides a work around https://github.com/OmniSharp/omnisharp-vscode/issues/4360#issuecomment-801181468 or you can try installing the dotnet-sdk-bin package which has the necessary file (see https://archlinux.pkgs.org/rolling/chaotic-aur-x86_64/dotnet-sdk-bin-5.0.3.sdk200-1-x86_64.pkg.tar.zst.html).