public void FilteredObservableCollection_WithFilter_ItemsAreFiltered()
{
var filteredCollection = new FilteredObservableCollection <int>();
filteredCollection.Filter = item => item != 13;
filteredCollection.Add(5);
filteredCollection.Add(7);
filteredCollection.Add(13);
filteredCollection.Add(17);
Assert.AreEqual(3, filteredCollection.Count);
Assert.AreEqual(5, filteredCollection.First());
Assert.AreEqual(7, filteredCollection.ElementAt(1));
Assert.AreEqual(17, filteredCollection.ElementAt(2));
}
public void FilteredObservableCollection_FilterChanged_ItemsAreFilteredByNewFilter()
{
var filteredCollection = new FilteredObservableCollection <string>();
filteredCollection.Filter = item => item != "Filter me!";
filteredCollection.Add("Not me");
filteredCollection.Add("Nor me");
filteredCollection.Add("Filter me!");
filteredCollection.Add("But not me");
Assert.AreEqual(3, filteredCollection.Count);
Assert.AreEqual("Not me", filteredCollection.First());
Assert.AreEqual("Nor me", filteredCollection.ElementAt(1));
Assert.AreEqual("But not me", filteredCollection.ElementAt(2));
filteredCollection.Filter = item => !item.StartsWith("No");
Assert.AreEqual(2, filteredCollection.Count);
Assert.AreEqual("Filter me!", filteredCollection.First());
Assert.AreEqual("But not me", filteredCollection.Last());
}