ObservableCollection FileSystemWatcher ListBox Updating Issue?

Take a look at the InsertItem code from the ObservableCollection class (from Reflector): Protected Overrides Sub InsertItem(ByVal index As Integer, ByVal item As T) Me. CheckReentrancy MyBase. InsertItem(index, item) Me.

OnPropertyChanged("Count") Me. OnPropertyChanged("Item") Me. OnCollectionChanged(NotifyCollectionChangedAction.

Add, item, index) End Sub Now use that as a guideline what notifications an ObservableCollection should perform. The OnCollectionChanged method is the main connection to the wpf notification system, if it gets called appropriately, then this calss is working properly, and somewhere else is the problem Also, in your OnPhotoCreated method, you call the Items. Add method, which doesn't do notifications it doesn't belong to the ObservableCollection class, but the Collection.

Take a look at the InsertItem code from the ObservableCollection class (from Reflector): Protected Overrides Sub InsertItem(ByVal index As Integer, ByVal item As T) Me. CheckReentrancy MyBase. InsertItem(index, item) Me.

OnPropertyChanged("Count") Me. OnPropertyChanged("Item") Me. OnCollectionChanged(NotifyCollectionChangedAction.

Add, item, index) End Sub Now use that as a guideline what notifications an ObservableCollection should perform. The OnCollectionChanged method is the main connection to the wpf notification system, if it gets called appropriately, then this calss is working properly, and somewhere else is the problem. Also, in your OnPhotoCreated method, you call the Items.

Add method, which doesn't do notifications, it doesn't belong to the ObservableCollection class, but the Collection class from which ObservableCollection inherits. As for the InvalidOperationException error, it sounds like a case of UI update from the wrong thread to me.

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