public PersonContext(PopulationContext population)
{
_fullName = this
.WhenAnyValue(x => x.FirstName, x => x.LastName,
(firstName, lastName) => $"{firstName} {lastName}")
.ToProperty(this, x => x.FullName);
_bestFriendName = this
.WhenAnyValue(x => x.BestFriend)
.Select(bf => bf == null
? Observable.Return("I don't have a best friend")
: bf.WhenAnyValue(f => f.FullName).Select(fn => $"{fn} is my best friend."))
.Switch()
.ToProperty(this, x => x.BestFriendName);
_itemsRemovedSubscription = population.People.BeforeItemsRemoved
.Do(p => Console.WriteLine($@"{FullName} => Person removed {p?.FullName}"))
.Where(p => p == BestFriend)
.Select(p => (PersonContext)null)
.BindTo(this, x => x.BestFriend);
}
public MainWindow()
{
InitializeComponent();
DataContext = new PopulationContext();
}
