C# Subject类代码示例

 public Observer(Subject subject, string name, string gap)
 {
     this.subject = subject;
     this.name = name;
     this.gap = gap;
     subject.Notify += Update;
 }

        private static void DeterministicDisposal()
        {
            Demo.DisplayHeader("The Using operator will make sure that the resource is disposed no matter what caused the observable to stop");

            Subject<int> subject = new Subject<int>();
            var observable =
                Observable.Using(() => Disposable.Create(() => { Console.WriteLine("DISPOSED"); }),
                    _ => subject);

            Console.WriteLine();
            Console.WriteLine("Disposed when completed");
            observable.SubscribeConsole();
            subject.OnCompleted();

            Console.WriteLine();
            Console.WriteLine("Disposed when error occurs");
            subject = new Subject<int>();
            observable.SubscribeConsole();
            subject.OnError(new Exception("error"));

            Console.WriteLine();
            Console.WriteLine("Disposed when subscription disposed");
            subject = new Subject<int>();
            var subscription =
                observable.SubscribeConsole();
            subscription.Dispose();
        }

        protected AutoSuspendApplication()
        {
            var host = new SuspensionHost();

            var launchNew = new[] { ApplicationExecutionState.ClosedByUser, ApplicationExecutionState.NotRunning, };
            host.IsLaunchingNew = _launched
                .Where(x => launchNew.Contains(x.PreviousExecutionState))
                .Select(_ => Unit.Default);

            host.IsResuming = _launched
                .Where(x => x.PreviousExecutionState == ApplicationExecutionState.Terminated)
                .Select(_ => Unit.Default);

            var unpausing = new[] { ApplicationExecutionState.Suspended, ApplicationExecutionState.Running, };
            host.IsUnpausing = _launched
                .Where(x => unpausing.Contains(x.PreviousExecutionState))
                .Select(_ => Unit.Default);

            var shouldPersistState = new Subject<SuspendingEventArgs>();
            Suspending += (o, e) => shouldPersistState.OnNext(e);
            host.ShouldPersistState =
                shouldPersistState.Select(x => {
                    var deferral = x.SuspendingOperation.GetDeferral();
                    return Disposable.Create(deferral.Complete);
                });

            var shouldInvalidateState = new Subject<Unit>();
            UnhandledException += (o, e) => shouldInvalidateState.OnNext(Unit.Default);
            host.ShouldInvalidateState = shouldInvalidateState;

            SuspensionHost = host;
        }

 public DayRow()
 {
     this.audience = new Audience();
     this.teacher = "NoTeacher";
     this.subject = new Subject();
     this.KindOfWeek = SheduleRedactor.KindOfWeek.Numerator;
 }

 public EventService()
 {
     RefreshRooms = new Subject<bool>();
     NotifyUnreadMessages = new Subject<IEnumerable<IMessageViewModel>>();
     PushMessage = new Subject<Tuple<string, IMessageViewModel>>();
     ReadRoom = new Subject<IRoomViewModel>();
 }

        public CurveDrawingSurface(
			ICurvePool curvePool,
			InputReference inputReference)
        {
            RenderOptions.SetBitmapScalingMode(this, BitmapScalingMode.Linear);

            // Wichtig für "Pan" und "Zoom"
            ClipToBounds = true;

            _curvePool = curvePool;
            _curvePool.CurveAdded += OnCurveAdded;
            _curvePool.CurveRemoved += OnCurveRemoved;

            inputReference.InputElement.MouseMove += (s, e) => HandleMouseMove(e);
            inputReference.InputElement.MouseLeave += (s, e) => HandleMouseLeave(e);
            inputReference.InputElement.MouseLeftButtonUp += (s, e) => HandleMouseLeftButtonUp(e);
            inputReference.InputElement.MouseLeftButtonDown += (s, e) => HandleMouseLeftButtonDown(e);
            inputReference.InputElement.MouseRightButtonUp += (s, e) => HandleMouseRightButtonUp(e);
            inputReference.InputElement.MouseRightButtonDown += (s, e) => HandleMouseRightButtonDown(e);

            _redrawSubject = new Subject<object>();
            _redrawSubject
                //.Skip(1)
                .Throttle(TimeSpan.FromMilliseconds(50))
                .Subscribe(it => _redrawEvent.Set());

            _redrawThread = new Thread(RedrawThreadProc);
            _redrawThread.IsBackground = true;
            _redrawThread.SetApartmentState(ApartmentState.STA);
            _redrawThread.Start();
        }

        internal AudioPlayer()
        {
            this.audioPlayerCallback = new DummyMediaPlayerCallback();
            this.videoPlayerCallback = new DummyMediaPlayerCallback();
            this.currentCallback = new DummyMediaPlayerCallback();

            this.finishSubscription = new SerialDisposable();
            this.gate = new SemaphoreSlim(1, 1);

            this.playbackState = new BehaviorSubject<AudioPlayerState>(AudioPlayerState.None);
            this.PlaybackState = this.playbackState.DistinctUntilChanged();

            this.loadedSong = new BehaviorSubject<Song>(null);
            this.TotalTime = this.loadedSong.Select(x => x == null ? TimeSpan.Zero : x.Duration);

            this.currentTimeChangedFromOuter = new Subject<TimeSpan>();

            var conn = Observable.Interval(TimeSpan.FromMilliseconds(300), RxApp.TaskpoolScheduler)
                .CombineLatest(this.PlaybackState, (l, state) => state)
                .Where(x => x == AudioPlayerState.Playing)
                .Select(_ => this.CurrentTime)
                .Merge(this.currentTimeChangedFromOuter)
                .DistinctUntilChanged(x => x.TotalSeconds)
                .Publish(TimeSpan.Zero);
            conn.Connect();
            this.CurrentTimeChanged = conn;
        }

        public void ZipMulti()
        {
            var a = new Subject<int>();
            var b = new Subject<int>();

            a.OnNext(10);
            b.OnNext(20);

            var l = Enumerable.Empty<Unit>().Select(_ => Notification.CreateOnNext(new { x = 0, y = 0 })).ToList();
            Observable.Zip(a, b).Select(xs => new { x = xs[0], y = xs[1] }).Materialize().Subscribe(x => l.Add(x));


            a.OnNext(1000);
            b.OnNext(2000);

            a.OnCompleted();

            l.Count.Is(1); // OnNext

            a.OnNext(1001);
            l.Count.Is(1);

            b.OnNext(5);
            l.Count.Is(2); // Completed!

            l[1].Kind.Is(NotificationKind.OnCompleted);
        }

        public AutoSuspendHelper(UIApplicationDelegate appDelegate)
        {
            Reflection.ThrowIfMethodsNotOverloaded("AutoSuspendHelper", appDelegate,
                "FinishedLaunching", "OnActivated", "DidEnterBackground");

            RxApp.SuspensionHost.IsLaunchingNew = Observable.Never<Unit>();
            RxApp.SuspensionHost.IsResuming = _finishedLaunching.Select(_ => Unit.Default);
            RxApp.SuspensionHost.IsUnpausing = _activated.Select(_ => Unit.Default);

            var untimelyDeath = new Subject<Unit>();
            AppDomain.CurrentDomain.UnhandledException += (o,e) => untimelyDeath.OnNext(Unit.Default);

            RxApp.SuspensionHost.ShouldInvalidateState = untimelyDeath;

            RxApp.SuspensionHost.ShouldPersistState = _backgrounded.SelectMany(app => {
                var taskId = app.BeginBackgroundTask(new NSAction(() => untimelyDeath.OnNext(Unit.Default)));

                // NB: We're being force-killed, signal invalidate instead
                if (taskId == UIApplication.BackgroundTaskInvalid) {
                    untimelyDeath.OnNext(Unit.Default);
                    return Observable.Empty<IDisposable>();
                }

                return Observable.Return(Disposable.Create(() => app.EndBackgroundTask(taskId)));
            });
        }

    public void BasicExperiment()
    {
      var xs = new Subject<int>();
      var ys = new Subject<int>();
      var zs = new Subject<int>();

      IObservable<int> query = xs.AsOperational() + ys - zs;

      using (query.Subscribe(ConsoleOutput))
      {
        xs.OnNext(1);
        ys.OnNext(5);
        zs.OnNext(2);

        xs.OnNext(2);
        ys.OnNext(6);
        zs.OnNext(3);

        xs.OnNext(3);
        xs.OnNext(4);

        zs.OnNext(4);
        zs.OnNext(5);

        ys.OnNext(7);
        ys.OnNext(8);

        WaitForKey();
      }
    }

    public void AdvancedExperiment()
    {
      var xs = new Subject<int>();
      var ys = new Subject<int>();
      var zs = new Subject<int>();

      // Define an operational factory so that operators are only specified once.
      var o = (Func<IObservable<int>, OperationalObservable<int>>)
        (source => source.AsOperational(
          add: (left, right) => left + (right * 5),
          subtract: (left, right) => left - right,
          multiply: (left, right) => left * right,
          divide: (left, right) => (left * 2) / right,
          negative: value => -value));

      IObservable<int> query = (-o(xs) * 2) + ys - (o(zs) / 4);

      using (query.Subscribe(ConsoleOutput))
      {
        xs.OnNext(1);
        ys.OnNext(5);
        zs.OnNext(4);

        xs.OnNext(2);
        ys.OnNext(6);
        zs.OnNext(8);

        xs.OnNext(3);
        ys.OnNext(7);
        zs.OnNext(12);

        WaitForKey();
      }
    }

        static void Main(string[] args)
        {
            Subject<int> numbers = new Subject<int>();
            var historicalScheduler = new System.Reactive.Concurrency.HistoricalScheduler(new DateTime(2015, 11, 21, 17, 10, 0));
            historicalScheduler.Schedule(new DateTime(2015, 11, 21, 17, 10, 0), () => numbers.OnNext(1));
            historicalScheduler.Schedule(new DateTime(2015, 11, 21, 17, 11, 0), () => numbers.OnNext(2));
            historicalScheduler.Schedule(new DateTime(2015, 11, 21, 17, 32, 0), () => numbers.OnNext(3));
            historicalScheduler.Schedule(new DateTime(2015, 11, 21, 17, 39, 0), () => numbers.OnNext(4));
            historicalScheduler.Schedule(new DateTime(2015, 11, 21, 17, 51, 0), () => historicalScheduler.Stop());

            numbers.AsObservable()
                .Buffer(TimeSpan.FromMinutes(20), historicalScheduler)
                .Subscribe(buffer =>
                {
                    Console.WriteLine("time is: {0}", historicalScheduler.Now);
                    Console.WriteLine("Buffer:");
                    foreach (var x in buffer)
                    {
                        Console.WriteLine("\t{0}", x);
                    }
                });

            historicalScheduler.Start();

            Console.WriteLine("Press <enter> to continue");
            Console.ReadLine();
        }

        public void CombineLatest()
        {
            var a = new Subject<int>();
            var b = new Subject<int>();

            a.OnNext(10);
            b.OnNext(20);

            var l = Enumerable.Empty<Unit>().Select(_ => Notification.CreateOnNext(new { x = 0, y = 0 })).ToList();
            a.CombineLatest(b, (x, y) => new { x, y }).Materialize().Subscribe(x => l.Add(x));

            a.OnNext(1000);
            b.OnNext(2000);
            l[0].Value.Is(new { x = 1000, y = 2000 });

            b.OnNext(3000);
            l[1].Value.Is(new { x = 1000, y = 3000 });

            a.OnNext(5000);
            l[2].Value.Is(new { x = 5000, y = 3000 });

            a.OnCompleted();
            l.Count.Is(3);

            a.OnNext(1001);
            l.Count.Is(3);

            b.OnNext(5);
            l[3].Value.Is(new { x = 5000, y = 5 });
            b.OnNext(500);
            l[4].Value.Is(new { x = 5000, y = 500 });

            b.OnCompleted();
            l[5].Kind.Is(NotificationKind.OnCompleted);
        }

 public void Main()
 {
     var subject = new Subject();
     var Observer = new Observer(subject, "Center", "\t\t");
     var observer2 = new Observer(subject, "Right", "\t\t\t\t");
     subject.Go();
 }

        public void NotifiesOfSegmentWhenFileIsCreated()
        {
            //need to make this test
            var file = Path.GetTempFileName();
            var info = new FileInfo(file);
            var refresher = new Subject<Unit>();

            var segmenter = new FileSegmenter(info.WatchFile(refresher), 1000);
            FileSegmentCollection result = null;

            using (var indexer = segmenter.Segments.Subscribe(segment => result = segment))
            {
                result.Should().NotBeNull();

                File.AppendAllLines(file,
                    Enumerable.Range(1, 10000).Select(i => $"This is line number {i.ToString("00000000")}").ToArray());
                refresher.Once();

                result.Should().NotBeNull();
                result.Count.Should().BeGreaterOrEqualTo(2);
                result.Segments.Select(fs => fs.Type).Should().Contain(FileSegmentType.Head);
                result.Segments.Select(fs => fs.Type).Should().Contain(FileSegmentType.Tail);
                result.FileLength.Should().Be(info.Length);


                File.AppendAllLines(file, Enumerable.Range(101, 10).Select(i => $"{i}"));
                refresher.Once();
                info.Refresh();
                result.FileLength.Should().Be(info.Length);

                File.Delete(file);
            }

            File.Delete(file);
        }