System.Net.Http.NoWriteNoSeekStreamContent.SerializeToStreamAsync C# (CSharp) Method

        protected override Task SerializeToStreamAsync(Stream stream, TransportContext context)
        {
            Debug.Assert(stream != null);

            if (_contentConsumed)
            {
                throw new InvalidOperationException(SR.net_http_content_stream_already_read);
            }
            _contentConsumed = true;

            const int BufferSize = 8192;
            Task copyTask = _content.CopyToAsync(stream, BufferSize, _cancellationToken);
            if (copyTask.IsCompleted)
            {
                try { _content.Dispose(); } catch { } // same as StreamToStreamCopy behavior
            }
            else
            {
                copyTask = copyTask.ContinueWith((t, s) =>
                {
                    try { ((Stream)s).Dispose(); } catch { }
                    t.GetAwaiter().GetResult();
                }, _content, CancellationToken.None, TaskContinuationOptions.ExecuteSynchronously, TaskScheduler.Default);
            }
            return copyTask;
        }