public BasicUsagesWindowVewModel()
{
Input = new ReactiveProperty <string>();
Output = Input.Delay(TimeSpan.FromSeconds(1))
.Select(x => x?.ToUpper())
.ToReadOnlyReactiveProperty()
.AddTo(Disposables);
InputSlim = new ReactivePropertySlim <string>();
OutputSlim = InputSlim.Delay(TimeSpan.FromSeconds(1))
.Select(x => x?.ToUpper())
.ObserveOnUIDispatcher()
.ToReadOnlyReactivePropertySlim() // TODO:???必要なのか？
.AddTo(Disposables);
}