EventAggregator

MainViewModel.cs

  string _loadingText = "Carregando...";
        public string LoadingText
        {
            get { return _loadingText; }
            set { SetProperty(ref _loadingText, value); }
        }


protected MainViewModel(IEventAggregator ea) 
        {
            ea.GetEvent<MessageSentEvent>().Subscribe(MessageReceived);
        }
        
private void MessageReceived(string parametro)
        {
            var mensagem = parametro;

            LoadingText = parametro;
        }