MVVM Prism EventAggregator

Hallo

Ich habe eine View wo nach Daten gesucht wird. Aus der View soll am anfang eine ander View geöffnet (nur ein mal) werden und über

_eventAggregator.GetEvent<DataUpdatedEvent>().Publish(value); eine Daten Klasse übermittelt werden.

Wenn andere Daten gesucht werden, soll dann nur der _eventAggregator.GetEvent<DataUpdatedEvent>().Publish(value);

gestartet werden und denn Datensatz an das Datagrid übermittelt.

Leider klappte es nicht. Was mache ich Falsch ? Oder wie kann man das besser machen ?

Danke für die Hilfe schon mal.

public partial class RemiSearchView : Window
    {
        private IEventAggregator eventAggregator;
        RemiSearchViewModel remiSearchViewModel = new RemiSearchViewModel();
        public RemiSearchView(string user)
        {
            InitializeComponent();

            this.eventAggregator = new EventAggregator();
            this.DataContext = new RemiSearchViewModel(eventAggregator);
            remiSearchViewModel.InitializeData(user);
        }
    }

RemiSearchViewModel:

private readonly IEventAggregator _eventAggregator;
public RemiSearchViewModel(IEventAggregator eventAggregator)
        {
            _eventAggregator = eventAggregator;

            this.ScanClickCommand = new DelegateCommand
            (
                (o) => Shipment != null,
                (o) => { ScanCommand(o); }
            );
            this.NameClickCommand = new DelegateCommand
            (
                (o) => Shipment != null,
                (o) => { NameCommand(o); }
            );
        }  

Denn nächsten schritt lass ich aus.

private void OpenViewRemi(HouseShipmentResults value)
        {
            if(count == 0)
            {
                DifferentMarketplacesView differentMarketplacesView = new DifferentMarketplacesView();
                differentMarketplacesView.Show();

                _eventAggregator.GetEvent<DataUpdatedEvent>().Publish(value);

                count++;
            }
            else
            {
                _eventAggregator.GetEvent<DataUpdatedEvent>().Publish(value);
            }
        }  
              
 public partial class DifferentMarketplacesView : Window
    {
        private IEventAggregator eventAggregator;

        public DifferentMarketplacesView()
        {
            InitializeComponent();

            this.eventAggregator = new EventAggregator();
            this.DataContext = new DifferentMarketplacesViewModel(eventAggregator);
        }
    } 
    
public DifferentMarketplacesViewModel(IEventAggregator eventAggregator)
        {
            _eventAggregator = eventAggregator;

            _eventAggregator.GetEvent<DataUpdatedEvent>().Subscribe(OnDataUpdated);

            this.MenuClickCommand = new DelegateCommand
            (
                (o) => ShipmentReturn != null,
                (o) => { MenuCommand(); }
            );
            this.PrintClickCommand = new DelegateCommand
            (
                (o) => ShipmentReturn != null,
                (o) => { PrintCommand(); }
            );
            this.ArticleClickCommand = new DelegateCommand
            (
                (o) => ShipmentReturn != null,
                (o) => { ArticleCommand(o); }
            );
            this.FocusClickCommand = new DelegateCommand
            (
                (o) => ShipmentReturn != null,
                (o) => { FocusCommand(o); }
            );

            articleInfo = mentionRepository.GetArticleInfo();

            TextBoxOrderFocus = true;
        }

OnDataUpdated wird nicht aufgerufen.

private void OnDataUpdated(HouseShipmentResults updatedData)
        {
            User = updatedData.Worker;

            ShipmentReturn.Add(updatedData);

            countToPrint = (int)ShipmentReturn.Sum(x => Convert.ToInt16(x.CustomArticleCount));
        }

Hallo

Ich hatte Prism mehrmal initialisiert. Deswegen ging es nicht.

RemiSearchViewModel:

private readonly IEventAggregator _eventAggregator;
public RemiSearchViewModel()
        {
            this._eventAggregator = new EventAggregator();

            this.ScanClickCommand = new DelegateCommand
            (
                (o) => Shipment != null,
                (o) => { ScanCommand(o); }
            );
            this.NameClickCommand = new DelegateCommand
            (
                (o) => Shipment != null,
                (o) => { NameCommand(o); }
            );
        }
        
public partial class DifferentMarketplacesView : Window
    {
        private IEventAggregator eventAggregator;

        public DifferentMarketplacesView(IEventAggregator eventAggregator)
        {
            InitializeComponent();

            this.DataContext = new DifferentMarketplacesViewModel(eventAggregator);
        }
    }   
    
public DifferentMarketplacesViewModel(IEventAggregator eventAggregator)
        {
            _eventAggregator = eventAggregator;

            _eventAggregator.GetEvent<DataUpdatedEvent>().Subscribe(OnDataUpdated);

            this.MenuClickCommand = new DelegateCommand
            (
                (o) => ShipmentReturn != null,
                (o) => { MenuCommand(); }
            );
            this.PrintClickCommand = new DelegateCommand
            (
                (o) => ShipmentReturn != null,
                (o) => { PrintCommand(); }
            );
            this.ArticleClickCommand = new DelegateCommand
            (
                (o) => ShipmentReturn != null,
                (o) => { ArticleCommand(o); }
            );
            this.FocusClickCommand = new DelegateCommand
            (
                (o) => ShipmentReturn != null,
                (o) => { FocusCommand(o); }

            );

            articleInfo = mentionRepository.GetArticleInfo();

            TextBoxOrderFocus = true;
        }
        private void OnDataUpdated(HouseShipmentResults updatedData)
        {
            User = updatedData.Worker;

            ShipmentReturn.Add(updatedData);

            countToPrint = (int)ShipmentReturn.Sum(x => Convert.ToInt16(x.CustomArticleCount));
        }