[英]RX and Model-View-Presenter in WinForms
I am new to RX and I'm trying to adapt it to my WinForms application. 我是RX的新手,我正在尝试使其适应我的WinForms应用程序。 (Un?)fortunately I use MVP pattern where the View is abstracted from any specific implementation (eg WinForms). (Un?)幸运的是,我使用MVP模式,其中View是从任何特定实现(例如WinForms)中抽象出来的。
When RX-friendly Model produces new value, presenter gets it and tries to update the view. 当RX友好模型产生新值时,演示者获取它并尝试更新视图。 The problem is that I cannot observe on the main thread since I have no reference to WinForms Control. 问题是,由于我没有引用WinForms控件,因此无法在主线程上进行观察。
I found a few solutions but neither of them looks well to me: 我找到了一些解决方案,但对我来说都不满意:
: :
public static IObservable<T> ObserveOn<T>(this IObservable<T> observable, IMyView view)
{
var control = (Control)view;
return observable.ObserveOn(control);
}
Is there a nice way to handle this? 有没有解决这个问题的好方法?
EDIT: I found another solution which I like the most: 编辑:我发现了另一个我最喜欢的解决方案:
private readonly SynchronizationContext _syncContext;
public Presenter()
{
_syncContext = SynchronizationContext.Current; //I can observe on this one with a reasonable assumption that presenter is created on the UI thread
}
Is the presenter running on the UI thread at the time that it subscribes to the model? 演示者在订阅模型时是否在UI线程上运行? Just use ObserveOnDispatcher at the time your present subscribes to the observable: 您现在订阅可观察对象时,只需使用ObserveOnDispatcher :
// from your presenter code, which is running on the UI thread:
model.ObservableProperty.ObserveOnDispatcher().Subscribe(p => updateView(p));
Edit: 编辑:
Alternatively, you can get Rx-Windows Forms Helper
and have your IMyView
interface expose an IScheduler
(which it creates by calling new ControlScheduler(control)
). 或者,您可以获取Rx-Windows Forms Helper
并让您的IMyView
界面公开一个IScheduler
(它通过调用new ControlScheduler(control)
创建)。
Then you can implement your ObserveOn(observable, view)
extension method as: 然后,您可以将ObserveOn(observable, view)
扩展方法实现为:
public static IObservable<T> ObserveOn<T>(this IObservable<T> observable, IMyView view)
{
return observable.ObserveOn(view.Scheduler);
}
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