问题
What are the steps required to make the two items available in the Add Portable Class Library dialog?

回答1:
Please see my answer in Creating a PCL that targets Monodroid
In the meantime, there are quite a few blog posts around on how to get PCLs working unofficially - eg.:
- http://blogs.endjin.com/2013/05/xamarin-platform-setup-gotchas/
- http://slodge.blogspot.co.uk/2013/04/my-current-pcl-setup-in-visual-studio.html
来源:https://stackoverflow.com/questions/16678066/xamarin-support-in-add-portable-class-library-dialog