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  1.     public class LivetWeakEventListener<TDelegate, TEventArgs> where TEventArgs : EventArgs
  2.     {
  3.         private EventHandler<TEventArgs> _handler;
  4.         private TDelegate _resultHandler;
  5.         private Action<TDelegate> _remove;
  6.  
  7.         private static void ReceiveEvent(WeakReference listenerWeakReference, object sender, TEventArgs args)
  8.         {
  9.             var listener = listenerWeakReference.Target as LivetWeakEventListener<TDelegate, TEventArgs>;
  10.  
  11.             if (listener != null)
  12.             {
  13.                 var handler = listener._handler;
  14.  
  15.                 if (handler != null)
  16.                 {
  17.                     handler(sender, args);
  18.                 }
  19.             }
  20.         }
  21.  
  22.         private static TDelegate GetStaticHandler(WeakReference listenerWeakReference, Func<EventHandler<TEventArgs>, TDelegate> conversion)
  23.         {
  24.             return conversion((sender, e) => ReceiveEvent(listenerWeakReference, sender, e));
  25.         }
  26.  
  27.         private LivetWeakEventListener() { }
  28.  
  29.         //コンストラクタ
  30.         public LivetWeakEventListener(
  31.             Func<EventHandler<TEventArgs>, TDelegate> conversion, 
  32.             Action<TDelegate> add, 
  33.             Action<TDelegate> remove, 
  34.             EventHandler<TEventArgs> handler)
  35.         {
  36.             _handler = handler;
  37.             _remove = remove;
  38.  
  39.             _resultHandler = GetStaticHandler(new WeakReference(this), conversion);
  40.  
  41.             add(_resultHandler);
  42.         }
  43.  
  44.         //解放
  45.         public void Release()
  46.         {
  47.             _remove(_resultHandler);
  48.         }
  49.  
  50.     }
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https://ideone.com/fOq6H
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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