CollectionChanged sample

Question

Can someone point to an example where CollectionChanged is implemented. I am using wpf mvvm light. I tried to google, didn\'t find anything good enough.

Answer 1

public ObservableCollection Names { get; set; }

public ViewModel()
{
   names = new ObservableCollection();
   Names.CollectionChanged += this.OnCollectionChanged;
}

void OnCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
   //Get the sender observable collection
   ObservableCollection obsSender = sender as ObservableCollection;

   List editedOrRemovedItems = new List();
   foreach(string newItem in e.NewItems)
   {
       editedOrRemovedItems.Add(newItem);
   }

   foreach(string oldItem in e.OldItems)
   {
       editedOrRemovedItems.Add(oldItem);
   }

   //Get the action which raised the collection changed event
   NotifyCollectionChangedAction action = e.Action;
}

For more information about the NotifyCollectionChangedEventArgs look here.

EDIT: Because you need a list of added/removed items, I modified the sample code.