public static Task<bool> GracefulStop( this ActorRef target, TimeSpan timeout, Object stopMessage )
<ExtensionAttribute> _ Public Shared Function GracefulStop ( _ target As ActorRef, _ timeout As TimeSpan, _ stopMessage As Object _ ) As Task(Of Boolean)
[ExtensionAttribute] public: static Task<bool^>^ GracefulStop( ActorRef^ target, TimeSpan^ timeout, Object^ stopMessage )