Question

I am using VS2010 – WPF – C#

I have a listview that takes its items from a source using this instruction :

this.listView1.ItemsSource = CollectionViewSource.GetDefaultView(getTicker());

the problem is that every time the source gets updated, my listview doesn’t get updated ??

I know I have to do something with the OnCollectionChanged event but I don’t know how to do it

Please help me with that . . .

Answer 1

I’m not sure why you are using CollectionViewSource.GetDefaultView(getTicker());

Assuming that getTicker() returns a list of items you can do

this.listView1.ItemsSource = getTicker();

If you want to make sure that your listview updates when the source collection changes then you have to use a collection which implements the INotifyCollectionChanged interface, for example ObservableCollection does that. However you have to make sure that your update your collection on the UI thread.

Update: Here is how you can use ObservableCollection:

var TickerData = new ObservableCollection<MyData>();
this.listView1.ItemsSource = TickerData;

Then you can add/remove items to/from TickerData and the UI will update itself automatically because ObservableCollection implements INotifyCollectionChanged which exposes a CollectionChanged event handler which the listview subscribes to.

I think you might want to have a look at some tutorials on WPF.