MacOSX 上的 VSCode 開啟 mono 專案，C# Extension 跑出找不到 .NET Framework 4.7.1 的錯誤

2020-11-22 135 words One minute

MacOS 上要先安裝 .NET Core SDK 及 Mono 才能使用 VSCode 打開 mono/.NET 專案，但安裝後 VSCode 的 C# Extension 還是跳錯誤訊息

症狀

VSCode 錯誤訊息如下

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[fail]: OmniSharp.MSBuild.ProjectLoader
        The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

解法

VSCode 的延伸模組設定(Extension)，搜尋 Omnisharp: Use Global Mono，設定改為 always，重啟 OmniSharp 即可

Reference

https://github.com/OmniSharp/omnisharp-vscode/issues/3063#issuecomment-678223360
https://tkymx83.hatenablog.com/entry/2020/08/23/170913