FieldBinding和弱引用

Question

我願意使用INC<T>版本的notify屬性更改mecanism，它比Property + Field + RaisePropertyChanged版本更簡潔。

但是，讓我們說我有這樣的視圖模型：

public abstract class PageViewModel : MvxViewModel 
{ 
    /// <summary> 
    ///  The is loading 
    /// </summary> 
    public readonly INC<bool> IsLoading = new NC<bool>(); 

    /// <summary> 
    ///  The subtitle 
    /// </summary> 
    public readonly INC<string> Subtitle = new NC<string>(); 

    /// <summary> 
    ///  The title 
    /// </summary> 
    public readonly INC<string> Title = new NC<string>(); 

現在，讓我們說，我在我的Android的活動，我想訂閱這些屬性：

public partial class MainView : IFragmentHost 
{ 
    private void Subscribe(PageViewModel viewModel) 
    { 
     viewModel.Title.Changed += (xx) => Whatever; 
    } 

在第二不過，這將是很好WeakSubscribe給他們，讓：

viewModel.Title.WeakSubscri... 

Mmmmh怪異，我沒有對自動完成那。

讓我們來看看MvxWeakSubscriptionExtensionMethods：

public static class MvxWeakSubscriptionExtensionMethods 
{ 
    public static MvxNotifyPropertyChangedEventSubscription WeakSubscribe(this INotifyPropertyChanged source, EventHandler<PropertyChangedEventArgs> eventHandler) 
    { 
     return new MvxNotifyPropertyChangedEventSubscription(source, eventHandler); 
    } 

    public static MvxValueEventSubscription<T> WeakSubscribe<T>(this EventInfo eventInfo, object source, EventHandler<MvxValueEventArgs<T>> eventHandler) 
    { 
     return new MvxValueEventSubscription<T>(source, eventInfo, eventHandler); 
    } 

而且現在INC<T>

public interface INC<T> : INotifyChange<T>, INotifyChange 

那麼，有沒有辦法弱訂閱INC<T>財產？

Answer 1

插件本身使用使得使用弱引用綁定：

IDisposable _subscription = NotifyChangeEventInfo.WeakSubscribe(_notifyChange, NotifyChangeOnChanged); 

其中NotifyChangeOnChanged有簽名：

protected abstract void NotifyChangeOnChanged(object sender, EventArgs eventArgs); 

從https://github.com/MvvmCross/MvvmCross/blob/3.2/Plugins/Cirrious/FieldBinding/Cirrious.MvvmCross.Plugins.FieldBinding/MvxNotifyChangeFieldSourceBinding.cs#L38