Akka.Streams.Implementation.IO.FileSubscriber.PreStart C# (CSharp) Method

        protected override void PreStart()
        {
            try
            {
                _chan = _f.Open(_fileMode, FileAccess.Write);
                base.PreStart();
            }
            catch (Exception ex)
            {
                _completionPromise.TrySetResult(new IOResult(_bytesWritten, Result.Failure<NotUsed>(ex)));
                Cancel();
            }
        }