Curios as to why this doesn't work...

[Michael Eber]

I have a WPF application which contains a ListView defined to show the values for an item in a chart. One of the fields, State, is supposed to change as the charted values cross warning and alarm barriers. I built up the list (which was really only one item) as follows:

 ObservableCollection<LegendValues> itemList = new ObservableCollection<LegendValues>();
 LegendValues item = new LegenValues();
 ... define the initial values ...
 itemList.Add( item );
 myListView.ItemsSource = itemList;


 // further on in my code
 item.State = "Warn";

I also have the binding set in XAML as TwoWay. When I change the state in the item object, it does not change in the ListView. Is there something I'm missing? Thanks, Michael

[Abhinav S]

Michael Eber wrote:

Is there something I'm missing?

INotifyProperty perhaps?

[Michael Eber]

Well...according to the documentation all I need are two things. TwoWay link on the binding between the ItemSource object and the ListIndex, and the ObservableCollection. But I can add INotifyProperty and see if that helps.

[Pete OHanlon]

ObservableCollection is only used to tell the binding engine when records have been added or removed from the collection. In order to watch changes to particular properties, you need to use INotifyPropertyChanged and raise the PropertyChanged event.

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[Jammer 0]

Have a read up on MVVM, in particular anything to do with the ViewModel portion of that design pattern and as Pete said it's all about the object INSIDE your ObservableCollection.

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[BechBej]

try to do add Updatesourcetrigger = Propertychanged to the xaml in addition to the two way, make sure that the object source bound property implement the INotifyPopertyChanged or is a dependency property