public void FilteredObservableCollection_Clear_RaisesCollectionChangedForUnfilteredItems()
{
var filteredCollection = new FilteredObservableCollection <int>();
filteredCollection.Filter = item => item != 13;
filteredCollection.Add(5);
filteredCollection.Add(7);
filteredCollection.Add(13);
filteredCollection.Add(17);
var collectionChangedRaisedCounter = 0;
void collectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.Action == NotifyCollectionChangedAction.Reset)
{
collectionChangedRaisedCounter++;
}
}
filteredCollection.CollectionChanged += collectionChanged;
filteredCollection.Clear();
filteredCollection.Clear(); // CollectionChanged raised allthough collection already empty!
filteredCollection.CollectionChanged -= collectionChanged;
Assert.AreEqual(2, collectionChangedRaisedCounter);
}
public void FilteredObservableCollection_Clear_RaisesPropertyChanged()
{
var filteredCollection = new FilteredObservableCollection <int>();
filteredCollection.Filter = item => item != 13;
filteredCollection.Add(5);
filteredCollection.Add(7);
filteredCollection.Add(13);
filteredCollection.Add(17);
var propertyChangedRaisedCounter = 0;
void propertyChanged(object sender, PropertyChangedEventArgs e)
{
if (e.PropertyName == nameof(filteredCollection.Count))
{
propertyChangedRaisedCounter++;
}
}
filteredCollection.PropertyChanged += propertyChanged;
filteredCollection.Clear();
filteredCollection.PropertyChanged -= propertyChanged;
Assert.AreEqual(1, propertyChangedRaisedCounter);
}
public void FilteredObservableCollection_Clear_RemovesAllItems()
{
var filteredCollection = new FilteredObservableCollection <string>();
filteredCollection.Add("Item 1");
filteredCollection.Add("Item 2");
filteredCollection.Add("Item 3");
filteredCollection.Clear();
foreach (var item in filteredCollection)
{
Assert.Fail("Collection must not contain items after Clear()!");
}
}
public void FilteredObservableCollection_Count_ShowsItemCount()
{
var filteredCollection = new FilteredObservableCollection <string>();
filteredCollection.Add("Item 1");
Assert.AreEqual(1, filteredCollection.Count);
filteredCollection.Add("Item 2");
filteredCollection.Add("Item 3");
Assert.AreEqual(3, filteredCollection.Count);
filteredCollection.Remove("Item 2");
Assert.AreEqual(2, filteredCollection.Count);
filteredCollection.Clear();
Assert.AreEqual(0, filteredCollection.Count);
}