protected IReadOnlyCollection <string> Handle(SupportedStatesQuery command) => _componentState.SupportedStates();
protected string HandleSupportedState(SupportedStatesQuery message) { return("xxx"); }
protected IReadOnlyCollection <string> Handle(SupportedStatesQuery command) => _componentState.SupportedStates();
protected string HandleSupportedState(SupportedStatesQuery message) { return("xxx"); }