Attempts to add a listener.
ArgumentNullException if the listener is null.
ArgumentNullException
ArgumentException if the listener already exists.
ArgumentException
The registered Id of the listener.
Id
Clears all listeners.
The number of listeners cleared.
Registers a listener. If the listener already exists, nothing changes and the original Id is returned.
Removes a listener by Id.
The listener or undefined if not found.
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Attempts to add a listener.
Throws
ArgumentNullExceptionif the listener is null.Throws
ArgumentExceptionif the listener already exists.Returns
The registered
Idof the listener.