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IApplication application = excelEngine.Excel;
application.DefaultVersion = ExcelVersion.Xlsx;
IWorkbook workbook = application.Workbooks.Open(excelFile);
var renderer = new XlsIORenderer();
var settings = new XlsIORendererSettings();
settings.ExportQualityImage = false;
settings.EmbedFonts = true;
settings.PdfConformanceLevel = PdfConformanceLevel.Pdf_A1B;
var pdfDocument = renderer.ConvertToPDF(workbook, settings);
var memoryStream = new MemoryStream();
pdfDocument.Save(memoryStream);
memoryStream.Position = 0;
return memoryStream;