Just for the heck of it, I tried compiling an ArcGIS Runtime for Windows Store app using .NET Native in the VS2015 Preview. Didn't work for me, unfortunately
. Here's compile error I got:
Unexpected: could not find an unspecialized version of Void set_Results(System.Collections.Generic.IEnumerable`1[Esri.ArcGISRuntime.Portal.ArcGISPortalGroup])