public void ReplaceRangeTest()
{
var c = new RangedObservableCollection <Person>();
var filtered = c.ToFilteredReadOnlyObservableCollection(x => x.IsRemoved);
var people = Enumerable.Range(1, 1000000).Select(x => new Person
{
Name = $"tanaka {x}",
IsRemoved = x % 2 == 0,
});
c.ReplaceRange(people);
filtered.Count.Is(500000);
}
public void ReplaceRangeRaisesCorrectCollectionChangedEvent()
{
var collection = new RangedObservableCollection <int>();
collection.AddRange(ItemsToAdd);
collection.CollectionChanged += (s, e) =>
{
Assert.Equal(NotifyCollectionChangedAction.Reset, e.Action);
Assert.Null(e.OldItems);
Assert.Null(e.NewItems);
};
collection.ReplaceRange(AlternateItemsToAdd);
Assert.Equal(AlternateItemsToAdd, collection.ToArray());
}
public void ReplaceRangeRaisesCollectionChangedOnce()
{
var collection = new RangedObservableCollection <int>();
collection.AddRange(ItemsToAdd);
var didTrigger = false;
collection.CollectionChanged += (s, e) =>
{
Assert.False(didTrigger);
didTrigger = true;
};
collection.ReplaceRange(AlternateItemsToAdd);
Assert.True(didTrigger);
}