New answers tagged projects-and-solutions
As you say in one of your comments the best way to go about this is by using a shared project and adding several heads to it. In your case a windows phone 8.1 head and a uwp head. This position was also expressed in an MVA by Jerry Nixon and Andy Wigley (I think this is it, but it has been updated since), in the section about porting 8.1 apps to uwp. In ...
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