public static void Unsubscribe <T>(Action <T> handler)
{
Subscriber anonymousSubscriber = new AnonymousSubscriber <T>(handler);
subscribers.TryRemove(anonymousSubscriber.GetHashCode(),
out anonymousSubscriber);
}
public static void Subscribe <T>(Action <T> handler)
{
var anonymousSubscriber = new AnonymousSubscriber <T>(handler);
subscribers.TryAdd(anonymousSubscriber.GetHashCode(), anonymousSubscriber);
}