在事件中使用System.Reactive

Question

我正在开发一个WPF应用程序。用户可以在表单中更改他们的地址。当用户单击一个按钮(更改他们的地址)并使用UserInfoEventArgs处理一些信息时，我想引发一个事件。我正在尝试使用反应性扩展。

MS Documentation (Subject constructor)

我有两个疑问。如何订阅mySubject，以及如何将UserInfoEventArgs添加到主题。

Subject<string[]> mySubject = new Subject<string[]>();

// How to subscribe to mySubject and use the method "AddressSubscriber" as the subscriber?

private void UserDataChangedHandler (object sender, UserInfoEventArgs info)
{
    string[] updatedAddress = info.NewAddress.ToArray();  

    if (updatedAddress.Any())
    {
        // How to add "updatedAddress" to mySubject so that "AddressSubscriber" can use it?
    }
}

private void AddressSubscriber(string[] adrs)
{ 
    // Do some operations with adrs
}

Answer 1

使用Observable.FromEventPattern方法而不是创建多余的Subject<T>

Observable.FromEventPattern<RoutedEventHandler, RoutedEventArgs>(
    h => btn.Click += h,
    h => btn.Click -= h)
        .Select(_ => new UserInfoEventArgs())
        .Subscribe(args => { /* do something with the args...*/ });

Answer 2

如何订阅mySubject并使用方法AddressSubscriber作为订阅者？

mySubject.Subscribe(adrs => AddressSubscriber(adrs));

如何将updatedAddress添加到mySubject中以便AddressSubscriber可以使用它？

mySubject.OnNext(updatedAddress);