public void WriteThumbnailTest_SetThumbnailBitmap() { var file = new DxfFile(); file.Header.Version = DxfAcadVersion.R2000; var header = DxfThumbnailImageSection.BITMAPFILEHEADER; var bitmap = header.Concat(new byte[] { 0x01, 0x23, 0x45 }).ToArray(); file.SetThumbnailBitmap(bitmap); VerifyFileContains(file, @" 0 SECTION 2 THUMBNAILIMAGE 90 3 310 012345 0 ENDSEC"); }