GCExcel 生成 pdf 文件并导出，文件页面上包含二维码等

GrapeCity.Documents.Excel.Workbook.SetLicenseKey("key");

var workbook = new Workbook();
var worksheet = workbook.Worksheets[0];

worksheet.Range["H1:I4"].Merge();
worksheet.Range["H1"].Formula = "=BC_QRCODE" + $"(\"{urlSetting.Value}\")";

var memory = new MemoryStream();
workbook.Save(memory, SaveFileFormat.Pdf);
memory.Seek(0, SeekOrigin.Begin);

Response.Headers.Add("Content-Disposition", new string[] { $"attachment; filename=test.pdf" });
return new FileStreamResult(pdfFileStream, "application/pdf");