I am working on a project which targets windows 8.1 (windows store app) and windows phone 8. A library is required that creates and receives TCP/UDP packets.
I have a piece of code that works on each, WP8 and Windows 8.1 (using the exact same code). However when I want to put this code in a portable class library suddenly certain using directives are not recognized any more:
using Windows.Networking;
using Windows.Networking.Connectivity;
using Windows.Networking.Sockets;
I understand that PCLs only have the featureset that overlaps between the frameworks however as these directives work in a Windows 8.1 class library and also in a WP8 library I was under the impression that I should be able to create a PCL out of it.
Where am I mistaken? If there is really no way to combine these into a PCL how can I approach this issue without keeping/maintaining duplicate code for each target?
Those are WinRT APIs, which PCLs don't currently support. You can vote for this feature here: http://visualstudio.uservoice.com/forums/121579-visual-studio/suggestions/4443287-make-winrt-api-usable-in-portable-class-libraries-
Your main options right now are to forgo PCLs, or to create a portable abstraction for this functionality and an implementation for each platform (in this case the code for each platform would be the same and could be shared via linked files).