使用VS2017样式的csproj定位Xamarin Mobile Mac

Question

I like the new 'msbuild pack' nuget package generation in VS2017. I would like to use it to generate a library that uses Xamarin.Mac to be consumed by Xamarin Mobile Mac projects. I tried

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFrameworks>Xamarin.Mac</TargetFrameworks>
  </PropertyGroup>

</Project>

but I get

Severity    Code    Description Project File    Line    Suppression State
Error       Cannot infer TargetFrameworkIdentifier and/or TargetFrameworkVersion from TargetFramework='Xamarin.Mac'. They must be specified explicitly. Kumquat.Common.Mac  C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\MSBuild\Sdks\Microsoft.NET.Sdk\build\Microsoft.NET.TargetFrameworkInference.targets    84  

This example ( https://github.com/Azure/azure-mobile-apps-net-client/blob/master/src/Microsoft.Azure.Mobile.Client/Microsoft.Azure.Mobile.Client.csproj ) has

<TargetFrameworks>netstandard1.4;net45;MonoAndroid71;Xamarin.iOS10;uap10.0</TargetFrameworks>

However, when I try Xamarin.iOS10 on my end, I get a similar error. Is there something special I need to install on my machine to get Xamarin.* as Target Frameworks? I do have Xamarin installed. I have VS2017 (version 15.2).

Answer 1

The Microsoft.NET.Sdk doesn't support automatic inference for this target framework yet. As you can see in the example you linked, they add the required definitions later in the same project:

 <PropertyGroup Condition=" '$(TargetFramework)' == 'Xamarin.iOS10' "> <TargetFrameworkIdentifier>Xamarin.iOS</TargetFrameworkIdentifier> <TargetFrameworkVersion>v1.0</TargetFrameworkVersion> <LanguageTargets>$(MSBuildExtensionsPath)\\Xamarin\\iOS\\Xamarin.iOS.CSharp.targets</LanguageTargets> <DefineConstants>$(DefineConstants);PLATFORM_IOS;XAMARIN_AUTH_INTERNAL</DefineConstants> </PropertyGroup> 

The .NET Sdk has logic to infer TargetFrameworkIdentifier and TargetFrameworkVersion only for netstandard , netcoreapp and net at the moment (see the source )