C# 如何仅构建与计算机上安装的内容兼容的项目？

我有一个针对项目文件中多个框架的库

netstandard1.1；netstandard2.0；网络45

但是，在macOS上运行它时，我会遇到以下错误，因为macOS上没有安装NETFramework 4.5

/usr/local/share/dotnet/sdk/3.1.403/Microsoft.Common.CurrentVersion.targets(1177,5): error MSB3644: The reference assemblies for .NETFramework,Version=v4.8 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 [/Users/x.x/Repos/kevbite/CompaniesHouse.NET/src/CompaniesHouse.Tests/CompaniesHouse.Tests.csproj]
/usr/local/share/dotnet/sdk/3.1.403/Microsoft.Common.CurrentVersion.targets(1177,5): error MSB3644: The reference assemblies for .NETFramework,Version=v4.8 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 [/Users/x.x/Repos/kevbite/CompaniesHouse.NET/src/CompaniesHouse.IntegrationTests/CompaniesHouse.IntegrationTests.csproj]
/usr/local/share/dotnet/sdk/3.1.403/Microsoft.Common.CurrentVersion.targets(1177,5): error MSB3644: The reference assemblies for .NETFramework,Version=v4.5 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 [/Users/x.x/Repos/kevbite/CompaniesHouse.NET/src/CompaniesHouse/CompaniesHouse.csproj]

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如何仅构建与计算机上安装的内容兼容的项目？因为我无法为macOS获得net45。

您将无法编译针对4.5和3.1的内容！ 从3到4有突破性的变化（我没有检查）

但不管怎样，也许你真的很幸运，把它改成net31就行了，我对此表示怀疑

您可以通过mono尝试intall dotnet 45：

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这在安装了所有框架目标的Windows上运行得非常好，并且此库中的框架之间没有破坏性的更改。我会尝试一下Mono，但理想情况下，我只想在没有额外框架的情况下使用它。您可以分别调用

netstandard1.1

和

netstandard2.0

，使用

-f

选项并跳过

net45