使用VS2017新建的Web项目报错：Package Microsoft.Composition 1.0.27 is not compatible with netcoreapp1.1

使用VS2017新建的Web项目报错：

看到这样的错误提示，毫无意义。赶脚这应该是VS2017的BUG，没有显示错误的位置。于是用dotnet restore手动还原，结果在控制台中终于显示了详细的错误：

C:Program Filesdotnetsdk1.0.0NuGet.targets(97,5): error : Package Microsoft.Composition 1.0.27 is not compatible with netcoreapp1.1 (.NETCoreApp,Version=v1.1). Package Microsoft.Composition 1.0.27 supports: portable-net45+win8+wp8+wpa81 (.NETPortable,Version=v0.0,Profile=Profile259) [C:UsersusernameDocumentsAdmin.Web.TestsAdmin.Web.Tests.csproj]
C:Program Filesdotnetsdk1.0.0NuGet.targets(97,5): error : One or more packages are incompatible with .NETCoreApp,Version=v1.1. [C:UsersusernameDocuments	estAdmin.Web.TestsAdmin.Web.Tests.csproj]

错误项目中的csproj文件：在PropertyGroup节点下增加portable-net45+win8+wp8+wpa81 

解决方案 :右键编辑项目添加下面内容

 <PropertyGroup>
    <TargetFramework>netcoreapp1.1</TargetFramework>
    <PackageTargetFallback>portable-net45+win8+wp8+wpa81</PackageTargetFallback>
  </PropertyGroup>

 转载：https://q.cnblogs.com/q/91766