当属性在 class 的 setter 之外更改时，如何让 ReactiveUI WhenAnyValue 发出

Question

我想知道我如何仍然可以使用属性触发 ReactiveUI 的 WhenAnyValue，它可以在 class 中的属性的 setter 之外更改。请原谅这个例子只是为了快速说明问题。假设我有两个 classes，一个是人，另一个是地址。

public class Address : ReactiveObject
{
    [Reactive]
    public string Street1 { get; set; }
    [Reactive]
    public string Street2 { get; set; }
    [Reactive]
    public string State { get; set; }
    [Reactive]
    public string City { get; set; }
    [Reactive]
    public string ZipCode { get; set; }
}

public class Person : ReactiveObject
{

    [Reactive]
    public string Name { get; set; }

    [Reactive]
    public Address Address { get; set; }


    public Person(Address address)
    {
        Address = address;
        address.Changed .Subscribe(_ =>
        {
            //Tried this way
            this.RaisePropertyChanged(_.PropertyName);

            //Also tried this way
            this.RaisePropertyChanged(nameof(Address));
        });

        this.Changed.Subscribe(_ =>
        {
            Console.WriteLine($"Person Property: {_.PropertyName} changed");
        });

        this.WhenAnyValue(_ => _.Name, _ => _.Address, (a, b) => "Emit").Subscribe(Console.WriteLine);
    }
}

private static void Main(string[] args)
{
    var address = new Address
    {
        Street1 = "Street1",
        Street2 = "Street2",
        City = "City",
        State = "LA",
        ZipCode = "11111"
    };

    var person = new Person(address);

    person.Name = "Name";
    Task.Delay(3000).Wait();

    address.City = "CityChanged";


    Console.ReadLine();
}

我认为我只需要订阅 Address Changed Observable，然后从 Person Raise属性Changed 中获取地址属性。它确实会向 Person 的 Changed Observable 发出信号，并且其行为符合我的预期，但是 Person 中的 WhenAnyValue Observable 在那种情况下永远不会发出。

Answer 1

我想通了这个问题。问题是我必须将所有嵌套属性添加到 WhenAnyValue。在我的示例中，如果我更改此行

this.WhenAnyValue(_ => _.Name, _ => _.Address, (a, b) => "Emit").Subscribe(Console.WriteLine);

到

this.WhenAnyValue(_ => _.Name, _ => _.Address.City, (a, b) => "Emit").Subscribe(Console.WriteLine);

它发射。那里的关键是将它从 _.Address 更改为 _.Address.City。此外，它仍然无需订阅 Address.Changed Observable 就可以发射，这更好。

当属性在 class 的 setter 之外更改时，如何让 ReactiveUI WhenAnyValue 发出

How to get ReactiveUI WhenAnyValue to emit when property is changed outside the setter of class

reactiveui

rx.net

当 属性 在 class 的 setter 之外更改时，如何让 ReactiveUI WhenAnyValue 发出

How to get ReactiveUI WhenAnyValue to emit when property is changed outside the setter of class

reactiveui

rx.net

当属性在 class 的 setter 之外更改时，如何让 ReactiveUI WhenAnyValue 发出