最新升级最新的vs2017后发现编译xamarin forms 会出现错误 Xamarin.Forms.Build.Tasks.GetTasksAbi task could not be loaded from the assembly C:ReposProjectpackagesXamarin.Forms.2.5.0.122203uildportable
解决办法非常简单
安装。net 4.7.1 即可
https://www.microsoft.com/net/download/thank-you/net471