public class MainViewModel : ViewModelBase{    private readonly SourceList<TeamMember> _sourceList = new SourceList<TeamMember>();    [Reactive] public int OnlineCount { get; set; }    [Reactive] public ReadOnlyObservableCollection<TeamMember> TeamMembers { get; private set; }    public MainViewModel()    {        var pub = _sourceList.Connect().ObserveOn(RxApp.MainThreadScheduler).Publish().RefCount();        pub.Bind(out var teamMembers).Subscribe();        TeamMembers = teamMembers;        pub.AutoRefreshOnObservable(x => x.WhenAnyValue(y => y.Online))            .Filter(x => x.Online)            .Count()            .Subscribe(x => OnlineCount = x);        Observable.Interval(TimeSpan.FromSeconds(1)).Do(_ =>           {               _sourceList.Edit(list =>               {                   foreach (var member in list)                   {                       member.Online = new Random().Next(0, 2) == 1;                   }               });           }).Subscribe();        MakeData();    }    private void MakeData()    {        AddMember("Alice", "Developer");        AddMember("Bob", "Designer");        AddMember("Charlie", "Manager");        AddMember("Diana", "Tester");        AddMember("Ethan", "DevOps");        AddMember("Fiona", "Product Owner");    }    private void AddMember(string name, string role) => _sourceList.Add(new TeamMember { Name = name, Role = role, Online = false });}public class TeamMember : ReactiveObject{    [Reactive] public string Name { get; set; } = string.Empty;    [Reactive] public string Role { get; set; } = string.Empty;    [Reactive] public bool Online { get; set; }}