使用 .nuspec 创建多目标 nuget 包

Question

I have specified multitargeting in my .csproj

<TargetFrameworks>netstandard2.0;net472</TargetFrameworks>

When I am using below script, then my package has dependencies and it is expected result:

dotnet pack --output nupkgs $ProjectPath -c:Release

The problem is when I also want to use .nuspec file with some information about package:

dotnet pack --output nupkgs $ProjectPath -c:Release -p:NuspecFile=$NuspecFile 

With .nuspec file the package has no dependencies and I can install it only in netstandard2.0...

<?xml version="1.0"?>
<package xmlns="http://schemas.microsoft.com/packaging/2013/05/nuspec.xsd">
  <metadata>
    <id>xyz</id>
    <version>1.2011.4</version>
    <title>xyz</title>
    <authors>xyz</authors>
    <projectUrl>xyz</projectUrl>
    <requireLicenseAcceptance>false</requireLicenseAcceptance>
    <description>xyz</description>
    <copyright>xyz</copyright>
  </metadata>
</package>

Should I add something to this .nuspec to have a package with target dependencies? I have read about tag, but to be honest I cannot find example how to configure it.

Answer 1

Given that you are using an SDK based projects, I'd strongly discourage using a nuspec unless your scenario cannot be satisfied because of it's complexity.

The automatic package generation with project file through dotnet.exe pack does much of the compatibility work for you.

If you really need to go with a nuspec, you should add dependency groups like defined here:

https://docs.microsoft.com/en-us/nuget/reference/nuspec#dependency-groups .

Make sure you add the relevant framework.

Example

    <group targetFramework=".NETFramework4.7.2">
        <dependency id="PackageA" version="1.2.3" />
    </group>
     <group targetFramework=".NETStandard2.0">
        <dependency id="PackageB" version="4.5.6" />
    </group>

Note that you need to add a dependency group for the specific frameworks you support.