I'm sure this will be a slam dunk for someone... fingers crossed
My ListView ItemsSource is bound to a Property on my ViewModel named TileItems.
Populating the list view updates perfectly.
In the ViewModel, where you see "existingTileItem.Transaction = e.Transaction" . . . The individual listview item updates perfectly.
In the ViewModel, where you see "Me.TileItems.Remove(existingTileItem)" ... The item is not removed from the View. It does successfully remove from the Me.TileItems collection, but the update is not depicted in the View.
Additional Info: AbstractViewModel implements INotificationPropertyChanged, I've tried overriding Equals in the TileItem and not overriding it, and the same results all around happen. I have seen this answer and this answer, but they do not answer the issue I am having.
XAML:
<UserControl.DataContext>
<local:TransactionTileResultsViewControlViewModel />
</UserControl.DataContext>
<ListView Grid.Row="1" Name="tileItems" ItemsSource="{Binding TileItems, Mode=TwoWay}"
ItemTemplate="{StaticResource tileItemDataTemplate}" ScrollViewer.HorizontalScrollBarVisibility="Hidden"
HorizontalAlignment="Stretch" VerticalAlignment="Stretch" />
ViewModel:
Public Class TransactionTileResultsViewControlViewModel
Inherits AbstractViewModel
Implements INavigationAware
Private _tileItems As TileItems
Public Property TileItems As TileItems
Get
Return Me._tileItems
End Get
Set(value As TileItems)
Me._tileItems = value
MyBase.RaisePropertyChanged("TileItems")
End Set
End Property
'....
#Region "TransactionUpdateReceived Methods"
Private Sub TransactionUpdateReceived_Handler(ByVal e As TransactionUpdatedEvent)
If e.Transaction IsNot Nothing Then
Dim existingTileItem As TileItem = Me.TileItems.Where(Function(t) t.Transaction.TransactionQueueID = e.Transaction.TransactionQueueID).FirstOrDefault()
If existingTileItem IsNot Nothing Then
If e.Transaction.Canceled Then
Me.TileItems.Remove(existingTileItem)
Else
If e.Transaction.ContainsFailedActivites() OrElse e.Transaction.ContainsCallbackActivities() Then
existingTileItem.Transaction = e.Transaction
Else
Me.TileItems.Remove(existingTileItem)
End If
End If
End If
End If
End Sub
#End Region
End Class
TileItems Model:
Public Class TileItems
Inherits ObservableCollection(Of TileItem)
End Class
TileItem Model:
Imports Microsoft.Practices.Prism.ViewModel
Public Class TileItem
Inherits NotificationObject
Private _created As Date
Public Property Created As Date
Get
Return _created
End Get
Set(value As Date)
_created = value
MyBase.RaisePropertyChanged("Created")
End Set
End Property
Private _category As String
Public Property Category As String
Get
Return _category
End Get
Set(value As String)
_category = value
MyBase.RaisePropertyChanged("Category")
End Set
End Property
Private _tileField1 As String
Public Property TileField1 As String
Get
Return _tileField1
End Get
Set(value As String)
_tileField1 = value
MyBase.RaisePropertyChanged("TileField1")
End Set
End Property
Private _tileField2 As String
Public Property TileField2 As String
Get
Return _tileField2
End Get
Set(value As String)
_tileField2 = value
MyBase.RaisePropertyChanged("TileField2")
End Set
End Property
Private _tileField3 As String
Public Property TileField3 As String
Get
Return _tileField3
End Get
Set(value As String)
_tileField3 = value
MyBase.RaisePropertyChanged("TileField3")
End Set
End Property
Private _transaction As Transaction
Public Property Transaction As Transaction
Get
Return _transaction
End Get
Set(value As Transaction)
_transaction = value
MyBase.RaisePropertyChanged("Transaction")
End Set
End Property
Public Overrides Function Equals(obj As Object) As Boolean
If TypeOf obj Is TileItem Then
Dim tileItem As TileItem = DirectCast(obj, TileItem)
If tileItem.Transaction IsNot Nothing AndAlso Me.Transaction IsNot Nothing Then
Return tileItem.Transaction.TransactionQueueID = Me.Transaction.TransactionQueueID
Else
Return False
End If
Else
Return False
End If
End Function
End Class
UPDATE:
Per @ReedCopsey 's answer, here is the update I made to get this working.
I updated Me.TileItems.Remove(existingTileItem) to be this now
Me.View.Dispatcher.Invoke(Sub()
Me.TileItems.Remove(existingTileItem)
End Sub, DispatcherPriority.ApplicationIdle)
