public void ReadOnlyObservableCollectionCount()
{
var ints = new ObservableCollection <int>();
var source = new ReadOnlyObservableCollection <int>(ints);
var values = new List <string>();
using (source.ObservePropertyChangedSlim("Count", signalInitial: false)
.Subscribe(x => values.Add(x.PropertyName)))
{
CollectionAssert.IsEmpty(values);
ints.Add(1);
CollectionAssert.AreEqual(new[] { "Count" }, values);
ints.Add(2);
CollectionAssert.AreEqual(new[] { "Count", "Count" }, values);
}
}
