参考文章：

  1. .NET Standard中配置TargetFrameworks输出多版本类库

TargetFrameworks（多个TargetFramework）

Framework名字：https://docs.microsoft.com/en-us/dotnet/standard/frameworks

  1. <Project Sdk="Microsoft.NET.Sdk">
  3.   <PropertyGroup>
  4.     <TargetFrameworks>netstandard2.0;net40;net45</TargetFrameworks>
  5.   </PropertyGroup>
  7.   <!-- 有条件地获取.NET Framework 4.0 目标的引用 -->
  8.   <ItemGroup Condition=" '$(TargetFramework)' == 'net40' ">
  9.     <Reference Include="System.Net" />
  10.   </ItemGroup>
  12.   <!-- 有条件地获取.NET Framework 4.5 目标引用 -->
  13.   <ItemGroup Condition=" '$(TargetFramework)' == 'net45' ">
  14.     <Reference Include="System.Net.Http" />
  15.     <Reference Include="System.Threading.Tasks" />
  16.   </ItemGroup>
  18. </Project>

程序引用

image.png

NuGet引用

  1.   <ItemGroup Condition="'$(TargetFramework)'=='netstandard2.0'">
  2.     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.9.0" />
  3.     <PackageReference Include="xunit" Version="2.4.0" />
  4.     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.0" />
  5.   </ItemGroup>