I'm having an issue with adding a dll reference to a shared project. As seen in the picture below I have a Universal solution with a project for windows and a project for windows phone.
In the HubApp1.Shared project I need to add a reference for some code in Class.cs. I will be using Class.cs in both the Windows project and the Windows Phone project. I have scoured Bing for how to fix this and I couldn't find anything.
You must add the reference in both WP and Windows project.
The reason for this is that shared project is not compiled into any output DLL - it is compiled into the project that references it, so it cannot reference any other project types except other Shared Projects.
来源：https://stackoverflow.com/questions/30029347/adding-references-in-a-shared-shproj-project