Defines methods for notifying an observer object when a subject being observed has changed
Declaration Syntax| C# | Visual Basic | Visual C++ |
public interface IObserver<TMessage>
Public Interface IObserver(Of TMessage)
generic<typename TMessage> public interface class IObserver
Generic Template Parameters- TMessage
- The type of the state being observed
Members| All Members | Methods | ||||
| Icon | Member | Description |
|---|---|---|
 | SubjectAttached(ObserverSubject<(Of <(TMessage>)>)) |
Called when the observer has been attached to a subject.
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| SubjectDetached(Int32, SubjectDetachReason) |
Called when the observer has been detached from a subject either by calling Detach or because the subject is being disposed.
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| SubjectUpdated(Int32, TMessage) |
Called for each attached observer when the observer subject calls Update()
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