public void EndUpdate_NestedUpdates_CollectionChangedRaised()
{
var collectionChangedEventArgsList = new List <NotifyCollectionChangedEventArgs>();
var collection = new ExtendedObservableCollection <int>();
collection.CollectionChanged += (_, args) => collectionChangedEventArgsList.Add(args);
collection.BeginUpdate();
collection.Add(1234);
collection.BeginUpdate();
collection.Add(5678);
collection.EndUpdate();
Assert.Empty(collectionChangedEventArgsList);
collection.EndUpdate();
Assert.Equal(2, collection.Count);
Assert.Single(collectionChangedEventArgsList);
Assert.Equal(NotifyCollectionChangedAction.Reset, collectionChangedEventArgsList[0].Action);
}
public void EndUpdate_NoUpdateMade_NoCollectionChangedRaised()
{
var collectionChangedEventArgsList = new List <NotifyCollectionChangedEventArgs>();
var collection = new ExtendedObservableCollection <int>();
collection.CollectionChanged += (_, args) => collectionChangedEventArgsList.Add(args);
collection.BeginUpdate();
collection.EndUpdate();
Assert.Empty(collection);
Assert.Empty(collectionChangedEventArgsList);
}
public void EndUpdate_EndUpdateAfterBeginUpdate_NoCollectionChangedRaised()
{
var collectionChangedEventArgsList = new List <NotifyCollectionChangedEventArgs>();
var collection = new ExtendedObservableCollection <int> {
135, 123, 456, 789
};
collection.CollectionChanged += (_, args) => collectionChangedEventArgsList.Add(args);
collection.BeginUpdate();
collection.Add(42);
Assert.Empty(collectionChangedEventArgsList);
collection.EndUpdate();
Assert.Single(collectionChangedEventArgsList);
Assert.Equal(NotifyCollectionChangedAction.Reset, collectionChangedEventArgsList[0].Action);
}
