public BooleanNotifier2ViewModel()
{
var booleanNotifier = new BooleanNotifier(initialValue: false);
var reactiveProperty = new ReactiveProperty <bool>(initialValue: false).AddTo(CompositeDisposable);
BooleanNotifierButtonCommand0 = booleanNotifier.ToReactiveCommand().AddTo(CompositeDisposable);
ReactivePropertyButtonCommand = reactiveProperty.ToReactiveCommand().AddTo(CompositeDisposable);
// CanExecute method of ReactiveCommand returns true as default.
// So, you set initialValue explicitly to `booleanNotifier.Value`.
BooleanNotifierButtonCommand1 = booleanNotifier
.ToReactiveCommand(initialValue: booleanNotifier.Value)
.AddTo(CompositeDisposable);
// Or if you would like to convert to something using Select and others
// before calling ToReactiveCommand, you can use StartWith.
BooleanNotifierButtonCommand2 = booleanNotifier
.StartWith(booleanNotifier.Value)
.Select(x => Something(x))
.ToReactiveCommand()
.AddTo(CompositeDisposable);
public TimerStartCommandViewModel()
{
// ctorからカウント開始
var ctorDateTime = DateTime.Now;
MyTimer1 = Observable.Interval(TimeSpan.FromSeconds(1))
.Select(_ => DateTime.Now - ctorDateTime)
.ToReadOnlyReactivePropertySlim()
.AddTo(CompositeDisposable);
#if false
// 1. DataTime.Now からの差分でカウント ◆もう少しかっちょよい実装ない？
var clickDateTime = DateTime.MinValue;
MyTimer2 = Observable.Interval(TimeSpan.FromSeconds(1))
.Where(_ => clickDateTime != DateTime.MinValue)
.Select(_ => DateTime.Now - clickDateTime)
.ToReadOnlyReactivePropertySlim()
.AddTo(CompositeDisposable);
StartCommand = new ReactiveCommand()
.WithSubscribe(() => clickDateTime = DateTime.Now, CompositeDisposable.Add);
StopCommand = new ReactiveCommand()
.WithSubscribe(() => clickDateTime = DateTime.MinValue, CompositeDisposable.Add);
#else
// 2. BooleanNotifier で管理。Command.CanExecute も取れるので良い感じ
var timerRunning = new BooleanNotifier(); // BooleanNotifier は IDisposable じゃないので Good！
//var timerRunning = new ReactivePropertySlim<bool>(initialValue: false).AddTo(CompositeDisposable);
MyTimer2 = Observable.Interval(TimeSpan.FromSeconds(1))
.TakeWhile(_ => timerRunning.Value)
.Repeat()
.Select(sec => TimeSpan.FromSeconds(sec))
.ToReadOnlyReactivePropertySlim()
.AddTo(CompositeDisposable);
StartCommand = timerRunning.Inverse()
.ToReactiveCommand(!timerRunning.Value)
.WithSubscribe(() => timerRunning.TurnOn(), CompositeDisposable.Add);
// ◆BooleanNotifier は (Rpと違って) Subscribe 時に LatestValue を発行しないので初期値の指定が必要する
StopCommand = timerRunning
.ToReactiveCommand(timerRunning.Value)
.WithSubscribe(() => timerRunning.TurnOff(), CompositeDisposable.Add);
#endif
}