How can i exclude specific target framework from nuspec (NuGet package) generation?

[petarpetrovt]

dotnet pack command generates NuGet package that contains all target frameworks not only netstandard2.0 and net5.0

There seems to be a way to pack only 1 tf - dotnet pack with -p:TargetFrameworks="net5.0" switch.
Passing multiple tfs dosen't seem to work i tried with netstandard2.0;net5.0, netstandard2.0|net5.0, netstandard2.0,net5.0

Example:

<Project Sdk="Microsoft.NET.Sdk">
    <PropertyGroup>
        <TargetFrameworks>netstandard2.0;net5.0;net5.0-windows</TargetFrameworks>
        <IsPackable>true</IsPackable>
    </PropertyGroup>
    <PropertyGroup Condition="'$(TargetFramework)' == 'net5.0-windows'">
        <IsPackable>false</IsPackable>
    </PropertyGroup>
</Project>

<?xml version="1.0" encoding="utf-8"?>
<package xmlns="http://schemas.microsoft.com/packaging/2012/06/nuspec.xsd">
  <metadata>
    <id>ExampleLibrary</id>
    <version>1.0.0</version>
    <authors>ExampleLibrary</authors>
    <description>Package Description</description>
    <dependencies>
      <group targetFramework="net5.0" />
      <group targetFramework="net5.0-windows7.0" />
      <group targetFramework=".NETStandard2.0" />
    </dependencies>
  </metadata>
  <files>
    <file src="C:\repos\ExampleLibrary\ExampleLibrary\bin\Debug\net5.0\ExampleLibrary.dll" target="lib\net5.0\ExampleLibrary.dll" />
    <file src="C:\repos\ExampleLibrary\ExampleLibrary\bin\Debug\net5.0-windows\ExampleLibrary.dll" target="lib\net5.0-windows7.0\ExampleLibrary.dll" />
    <file src="C:\repos\ExampleLibrary\ExampleLibrary\bin\Debug\netstandard2.0\ExampleLibrary.dll" target="lib\netstandard2.0\ExampleLibrary.dll" />
  </files>
</package>

[huoyaoyuan]

I don't know if there is a way to do this, but you can create a new csproj with less target frameworks, and pack with that csproj.