create multi target nuget package

Question

hi i want create multi target nuget package. Everything seems to work well Except that whene i create wpf NetCore3 app and install my package The .NET Framework dll is used and The NetCore3 library is not used

<files>
    <file src="lib\netcore\Control.dll" target="lib\netcore" />
    <file src="lib\net48\Control.dll" target="lib\net48" />
    <file src="lib\net40\Control.dll" target="lib\net40" />
    <file src="lib\net40\Microsoft.Windows.Shell.dll" target="lib\net40" />
  </files>

Is this lib\netcore correct?

zivkan · Accepted Answer · 2019-07-25 13:17:53Z

You should use the same TFM in the package as your csproj has in the <TargetFramework> element. If your csproj has <TargetFramework>netcore</TargetFramework>, then sure, use lib/netcore/whatever.dll. But if your csproj has <TargetFramework>netcoreapp3.0</TargetFramework>, then you should use lib/netcoreapp3.0/whatever.dll.

However, SDK style projects, the only type that work with .NET Core 3.0, support multi-targeting (change <TargetFramework> to <TargetFrameworks>, then use a semicolon delimited list netcoreapp3.0;net48;net40), and NuGet's pack targets know how to pack these projects automatically. So there is no need to create a nuspec yourself, which minimises the risk of making these types of mistakes.

So, just as NuGet's docs on creating multi-targeting packages says, just use dotnet pack to create your package, and let NuGet figure out what lib/* folders to use. Avoid using nuspec files. Any other metadata you specify in the nuspec can specified via MSBuild properties in your csproj.

Bruno Garcia · Accepted Answer · 2019-07-25 08:30:22Z

0

netcore is a Microsoft Store TFM.

For your .NET Core 3 (netcoreapp3.0) WPF app, you'd need to multi-target with netstandard or netcoreapp in your NuGet package.

For example:

<TargetFrameworks>netstandard2.0;net461</TargetFrameworks>

answered Jul 25, 2019 at 8:30

Bruno Garcia

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