Your project does not reference

运行生成类库报错：

Your project does not reference ".NETFramework,Version=v4.5.1" framework. Add a reference to ".NETFramework,Version=v4.5.1" in the "TargetFrameworks" property of your project file and then re-run NuGet rest

解决办法：

在类库文件夹中找到“obj”，然后删除，再重新生成即可。