1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Reactive.Linq; 5 using System.Text; 6 7 namespace PortableLibraryProfile78_NuGet 8 { 9 public class MyExtensions 10 { GetClock()11 public static IObservable<DateTime> GetClock() 12 { 13 return Observable.Interval(TimeSpan.FromSeconds(1)).Select(_ => DateTime.Now); 14 } 15 } 16 } 17