protected override void Dispose(bool isDisposing)
 {
     if (isDisposing)
     {
         _blockingEnumerable = null;
     }
 }
 public void Dispose()
 {
     _collection = null;
 }
 public IEnumerable <T> GetBlockingEnumerable(CancellationToken cancellationToken)
 {
     return(_blockingEnumerable ?? (_blockingEnumerable = SafeGetBlockingEnumerable(cancellationToken).ReEnumerable()));
 }
 internal Enumerator(MutableEnumerable <TT> collection)
 {
     _collection = collection;
 }