Your project is not referencing the ".NETFramework,Version=4.5" framework.

我遇到了

Your project is not referencing the “.NETFramework,Version=4.5” framework. Add a reference to “.NETFramework,Version=4.5” in the “frameworks” section of your project.json, and then re-run NuGet restore.

怎么弄都没法解决,我尝试了git撤销更改也无法解决,最后解决方法:删除/obj文件。
来自stackoverflow

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