system.reactive - 响应式扩展 (UI) 增加事件调用

Question

我有下面的代码。

this.ObservableForProperty(x => x.SelectedDay)
    .Throttle(TimeSpan.FromMilliseconds(3600))
    .Where(x => SelectedDay != null)
    .ObserveOn(CoreWindow.GetForCurrentThread().Dispatcher)
    .Subscribe(x => SomeRandomMethod());

Throttle 运行良好，在 x.SelectedDay 停止更改之前它不会调用 SomeRandomMethod。但是，每次它发生变化时都会调用它。

So i do this:  
Change,  
Change,  
Wait  
//SomeRandomMethod called 2 times at end of throttle  
Change  
Wait  
//SomeRandomMethod called 3 times
Change  
Change  
Change 
Wait  
//SomeRandomMethod called 6 times.

我怎样才能让它忽略所有以前的更改事件，并且只在油门完成它的时候获得最新的事件。

So i would like this:
Change   
Change 
Wait  
//SomeRandomMethod called once
Change  
Wait  
//SomeRandomMethod called once
Change  
Change  
Change 
Wait  
//SomeRandomMethod called once

Answer 1

你在哪里调用这个方法？您应该只在构造函数中调用它，并且只调用一次。此外，这是上面代码的更好版本：

this.ObservableForProperty(x => x.SelectedDay)
    .Throttle(TimeSpan.FromMilliseconds(3600), RxApp.DeferredScheduler)
    .Where(x => SelectedDay != null)
    .Subscribe(x => SomeRandomMethod());