Import data from dynamic collection to Excel worksheet in .NET Core

//Instantiate the spreadsheet creation engine
using (ExcelEngine excelEngine = new ExcelEngine())
{
    //Instantiate the excel application object.
    IApplication application = excelEngine.Excel;
 
    //The workbook is created
    IWorkbook workbook = application.Workbooks.Create(1);
 
    //The first worksheet object in the worksheets collection is accessed
    IWorksheet worksheet = workbook.Worksheets[0];
 
    //The dynamic collection is imported
    worksheet.ImportData(GetMembersReport(), 1, 1, true);
 
    worksheet.UsedRange.AutofitColumns();
 
    //Saving and closing the workbook
    MemoryStream stream = new MemoryStream();
    workbook.Version = ExcelVersion.Xlsx;
    workbook.SaveAs(stream);
 
    //Set the position as '0'.
    stream.Position = 0;
 
    //Download the Excel file in the browser
    FileStreamResult fileStreamResult = new FileStreamResult(stream, "application/excel");
    fileStreamResult.FileDownloadName = "Output.xlsx";
    return fileStreamResult;
}
 
public static List<ExpandoObject> GetMembersReport()
{
    List<ExpandoObject> reports = new List<ExpandoObject>();
    dynamic dynamicObject = new ExpandoObject();
    dynamicObject.Id = 01;
    dynamicObject.Name = "Andy Bernard";
    dynamicObject.Age = 21;
    reports.Add(dynamicObject);
 
    dynamicObject = new ExpandoObject();
    dynamicObject.Id = 02;
    dynamicObject.Name = "Jim Halpert";
    dynamicObject.Age = 23;
    reports.Add(dynamicObject);
 
    dynamicObject = new ExpandoObject();
    dynamicObject.Id = 03;
    dynamicObject.Name = "Karen Fillippe";
    dynamicObject.Age = 20;
    reports.Add(dynamicObject);
 
    return reports;
}