Can I remove duplicating events in EventAggregator?
- by Mcad001
Hi,
I have a quite simple scenario that I cannot get to work correctly. I have 2 views, CarView and CarWindowView (childwindow) with corresponding ViewModels. In my CarView I have an EditButton that that opens CarWindowView (childwindow) where I can edit the Car object fields.
My problem is that the DisplayModule method in my CarWindowView ViewModel is getting called too many times...When I push the edit button first time its getting called once, the second time its getting called twince, the third time its getting called 3 times and so fort... !
CarView ViewModel constructor:
Public Sub New(ByVal eventAggregator As IEventAggregator, ByVal con As IUnityContainer, ByVal mgr As ICarManager, ByVal CarService As ICarService)
_Container = con
_CarManager = mgr
_EventAggregator = eventAggregator
'Create the DelegateCommands
NewBtnClick = New DelegateCommand(Of Object)(AddressOf HandleNewCarBtnClick)
EditBtnClick = New DelegateCommand(Of Object)(AddressOf HandleEditCarBtnClick)
End Sub
CarView ViewModel HandleEditCarBtnClick method:
Private Sub HandleEditCarBtnClick()
Dim view = New CarWindowView
Dim viewModel = _Container.Resolve(Of CarWindowViewModel)()
viewModel.CurrentDomainContext = DomainContext
viewModel.CurrentItem = CurrentItem
viewModel.IsEnabled = False
view.ApplyModel(viewModel)
view.Show()
_EventAggregator.GetEvent(Of CarCollectionEvent)().Publish(EditObject)
End Sub
CarWindowView ViewModel constructor:
Public Sub New(ByVal eventAggregator As IEventAggregator, ByVal con As IUnityContainer, ByVal mgr As ICarManager, ByVal CarService As ICarService)
_Container = con
_CarManager = mgr
_EventAggregator = eventAggregator
_EventAggregator.GetEvent(Of CarCollectionEvent).Subscribe(AddressOf DisplayModule)
End Sub
CarWindowView ViewModel DisplayModule method (this is the method getting called too many times):
Public Sub DisplayModule(ByVal param As String)
If param = EditObject Then
IsInEditMode = True
' Logic removed for display reasons here. This logic breaks because it's called too many times.
End If
End Sub
So, I cannot understand how I can only have the EventAggregator to store just the one single click, and not all my click on the Edit button. Sorry if this is not to well explained! Help appreciated!!
