[英]ObservableCollection's CollectionChanged not firing
I have an ObservableCollection
, based on List
. 我有一个基于List
的ObservableCollection
。
private List<int> markers = new List<int>();
private ObservableCollection<int> markersObservable;
markersObservable = new ObservableCollection<int>(markers);
markersObservable.CollectionChanged += MarkersObservable_CollectionChanged;
When adding element into the list: 将元素添加到列表中时:
markers.Add(hScrollBarPoints.Value);
I expect collection changed event would fire, however, event never fired: 我预计会触发集合更改事件,但是该事件从未触发:
private void MarkersObservable_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
{
Console.WriteLine("Changed!");
}
What am I doing wrong? 我究竟做错了什么?
When you add items to the List
, the ObservableCollection
is not changed and thus does not fire the CollectionChanged
event. 当您将项目添加到List
, ObservableCollection
不会更改,因此不会触发CollectionChanged
事件。
To get the event fired, you have to add the item to the ObservableCollection
: 要触发该事件,您必须将该项目添加到ObservableCollection
:
markersObservable.Add(hScrollBarPoints.Value);
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