Riddle me this:
Can the new PCL version of Reactive Extensions be made to work with Xamarin?
If so, how?
Nope. But check out https://github.com/mono/rx/tree/rx-oss-v2.1/Rx/NET/Source/Rx_Xamarin for versions that do work.
Yes it is possible. At the moment, you will need to switch to the beta channel of the Xamarin tools which implement Mono 3.0. This can be done via Tools > Options > Xamarin in Visual Studio 2012.
Xamarin.Android 4.7 Information
The ReactiveUI project should have all of the libraries that you need. Here is a link to the libraries folder on their nuget site.
来源：https://stackoverflow.com/questions/16599214/is-reactive-extensions-2-1-pcl-compatible-with-xamarin