Why doesn't .NET have a built-in Observer pattern like Java?

Question

I wonder why in the .NET Framework there are no pairs (Observer / Observable) similar to Java?

EDIT: Yes, I know about events and delegates, but using these interfaces is a simple and book-like approach to this DP, right?

Answer 1

In .NET 4, it does the following: System.IObservable<T>and System.IObserver<T>(which are Dual IEnumerable<T> and IEnumerator<T>). Take a look at the Reactive Extensions (Rx) project for compositing these interfaces with asynchronous events.

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Answer 2

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Answer 3

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Answer 4

Events. Observer. : http://en.wikipedia.org/wiki/Observer_pattern

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Answer 5

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