How to target multiple frameworks for a library

I am making this Standard Library to target according to the downloaded framework. For example for .NET Core it will download the packages that are for .NET Core

 <!--Trageting .NET CORE (2.1, 3.0) && .NET STANDARD (2.0,2.1) -->
  <ItemGroup Condition="$(TargetFramework.StartsWith('netcore')) OR $(TargetFramework.StartsWith('netstandard')) ">
    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
    <PackageReference Include="Microsoft.AspNet.WebApi.Client" Version="5.2.7" />
    <!--<PackageReference Include="Microsoft.AspNet.WebApi.Core" Version="5.2.7" />-->
    <PackageReference Include="NLog.Extensions.Logging" Version="1.6.1" />
    <PackageReference Include="NLog.WindowsEventLog" Version="4.6.7" />
    <PackageReference Include="System.Diagnostics.EventLog" Version="4.6.0" />
    <PackageReference Include="System.Configuration.ConfigurationManager" Version="4.6.0" />
    <PackageReference Include="System.Data.SqlClient" Version="4.7.0" />
    <PackageReference Include="System.Linq" Version="4.3.0" />
    <PackageReference Include="Microsoft.Win32.Registry" Version="4.6.0" />
  </ItemGroup>
  
  <!--Targeting .NET FRAMEWORK (4.6.1 4.6.2)  -->
  <ItemGroup Condition="'$(TargetFramework)' == 'net461' OR '$(TargetFramework)' == 'net462'">
    <PackageReference Include="Newtonsoft.Json" Version="10.0.3" />
    <PackageReference Include="Microsoft.AspNet.WebApi.Client" version="5.2.3" />
    <PackageReference Include="Microsoft.AspNet.WebApi.Core" version="5.2.3" />
    <PackageReference Include="NLog.Extensions.Logging" Version="1.5.4" />
    <PackageReference Include="NLog.WindowsEventLog" Version="4.6.7" />
    <PackageReference Include="System.Diagnostics.EventLog" Version="4.5.0" />
    <PackageReference Include="System.Configuration.ConfigurationManager" Version="4.5.0" />
    <PackageReference Include="System.Data.SqlClient" Version="4.6.1" />
    <PackageReference Include="System.Linq" Version="4.3.0" />
    <PackageReference Include="Microsoft.Win32.Registry" Version="4.5.0" />
  </ItemGroup>

   <!--Targeting .NET FRAMEWORK (4.7, 4.7.1, 4.7.2)-->
  <ItemGroup Condition="'$(TargetFramework)' == 'net47' &#xD;&#xA; OR '$(TargetFramework)' == 'net471'&#xD;&#xA; OR '$(TargetFramework)' == 'net472'">
    <PackageReference Include="Newtonsoft.Json" Version="12.0.2" />
    <PackageReference Include="Microsoft.AspNet.WebApi.Client" version="5.2.3" />
    <PackageReference Include="Microsoft.AspNet.WebApi.Core" version="5.2.3" />
    <PackageReference Include="NLog.Extensions.Logging" Version="1.5.4" />
    <PackageReference Include="NLog.WindowsEventLog" Version="4.6.7" />
    <PackageReference Include="System.Diagnostics.EventLog" Version="4.5.0" />
    <PackageReference Include="System.Configuration.ConfigurationManager" Version="4.5.0" />
    <PackageReference Include="System.Data.SqlClient" Version="4.6.1" />
    <PackageReference Include="System.Linq" Version="4.3.0" />
    <PackageReference Include="Microsoft.Win32.Registry" Version="4.5.0" />
  </ItemGroup>

Is there any better way of doing this above code as mentioned like using DefineConstants?

Solution

If the thing you want to change is the versions with them having some amount of commonality, then I might be tempted to do something like:

<PropertyGroup>
    <VersionWebApiClient>5.2.3</VersionWebApiClient>
    <VersionWebApiClient Condition="...todo...">5.2.7</VersionWebApiClient>
    <!-- ... for the other things ... -->
<PropertyGroup>
<ItemGroup>
    <PackageReference Include="Microsoft.AspNet.WebApi.Client" Version="$(VersionWebApiClient)" />
    <!-- ... for the other things ... -->
</ItemGroup>

This:

allows the most common values to be simple defaults
allows clear overrides per target framework
doesn't duplicate the actual package references