用VS2017 build一个既包含net471项目又包含netstandard2.0项目的.net core解决方案时总是出现下面的错误
The type 'ICollection<>' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
慕仙森