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I wonder why .NET framework doesn’t have pair (Observer/Observable) interfaces similar to Java’s feature?
EDIT:
yes i know about events and delegates but using those interfaces is a simple and bookish approach of this DP isn’t it?
In .NET 4 it does:
System.IObservable<T>andSystem.IObserver<T>(which are a Dual ofIEnumerable<T>andIEnumerator<T>). Look at the Reactive Extensions (Rx) project for compositional use of these interfaces with asynchronous events.More generally, the Observer pattern is better served in .NET with events.