Stream wrapper to work around https://github.com/dotnet/corefx/issues/27326

NonFlushingStream.cs

/// <summary>
    /// Work around for https://github.com/dotnet/corefx/issues/27326
    /// </summary>
    public class NonFlushingStream : Stream
    {
        private readonly Stream _stream;

        public NonFlushingStream(Stream stream)
        {
            _stream = stream;
        }

        public override void Flush()
        {
        }

        public override int Read(byte[] buffer, int offset, int count) => _stream.Read(buffer, offset, count);

        public override long Seek(long offset, SeekOrigin origin) => _stream.Seek(offset, origin);

        public override void SetLength(long value) => _stream.SetLength(value);

        public override void Write(byte[] buffer, int offset, int count) => _stream.Write(buffer, offset, count);

        public override bool CanRead => _stream.CanRead;

        public override bool CanSeek => _stream.CanSeek;

        public override bool CanWrite => _stream.CanWrite;

        public override long Length => _stream.Length;

        public override long Position
        {
            get => _stream.Position;
            set => _stream.Position = value;
        }
    }