public void SourceManipulation()
{
var numbers = new RangeObservableCollection <int>(System.Linq.Enumerable.Range(1, 10).Select(i => i * 3));
using (var query = numbers.ActiveAll(i => i % 3 == 0))
{
Assert.IsNull(query.OperationFault);
Assert.IsTrue(query.Value);
numbers[0] = 2;
Assert.IsFalse(query.Value);
numbers.RemoveAt(0);
Assert.IsTrue(query.Value);
--numbers[0];
Assert.IsFalse(query.Value);
numbers.Clear();
Assert.IsTrue(query.Value);
numbers.Add(7);
Assert.IsFalse(query.Value);
}
}