C# (CSharp) OnObserversChangedの例

コード例 #1

 public Observer Subscribe(TextWriter writer)
 {
     _observers.Add(writer);
     OnObserversChanged?.Invoke(this, _observers.Count);
     return(new Observer(writer, this));
 }

コード例 #2

 public void Unsubscribe(TextWriter writer)
 {
     _observers.Remove(writer);
     OnObserversChanged?.Invoke(this, _observers.Count);
 }