Count
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public int ObserverManager<TIdentity, Count Gets the number of observers.
public int ObserverManager<TIdentity, Countpublic TimeSpan ObserverManager<TIdentity, ExpirationDurationpublic Func<DateTime> ObserverManager<TIdentity, GetDateTimepublic IReadOnlyDictionary<TIdentity, TObserver> ObserverManager<TIdentity, Observers