public override int GetHashCode()
 {
     unchecked
     {
         return(((Watchee?.GetHashCode() ?? 0) * 397) ^ (Watcher?.GetHashCode() ?? 0));
     }
 }
        public override int GetHashCode()
        {
            int hash = 1;

            if (watchee_ != null)
            {
                hash ^= Watchee.GetHashCode();
            }
            if (watcher_ != null)
            {
                hash ^= Watcher.GetHashCode();
            }
            return(hash);
        }