public MainWindow()
{
InitializeComponent();
DataContext = this;
Total =
Items
.ObserveItem(item => item.IsChecked)
.Merge()
.Select(isChecked => isChecked ? 1 : 0)
.Scan(0, (x, y) => x + y, (x, y) => x - y)
.ToReactiveProperty(0);
Items
.ObserveElementObservableProperty(item => item.RemoveCommand)
.Subscribe(pair =>
{
Items.Remove(pair.Instance);
});
AddCommand.StartWith(new object[] { null, null, null }).Subscribe(_ =>
{
Items.Add(new Item());
});
}