Exporting data to excel format : error when opening resulting file

问题

I made a routine to export a data table to excel. However, when I open the generated file in Excel 2013, I obtain an error saying

Repaired Records: "Informations of cell in part /xl/worksheets/sheet1.xml"

even though, when I click OK the document opens apparently well. The data appears to be ok.

The code of the controller is:

        public IActionResult ExportingXl()
        {
            OrdListViewModel o = HttpContext.Session.GetJson<OrdListViewModel>("MyVar");

            ExportExcelModel x = new ExportExcelClass(o.oTable); // this creates the excel file contents

            return File(x.ExcelContent, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "mydoc.xlsx");
        }

The ExportExcelClass is:

    using DocumentFormat.OpenXml;
    using DocumentFormat.OpenXml.Packaging;
    using DocumentFormat.OpenXml.Spreadsheet;

    public class ExportExcelClass
    {
        public byte[] ExcelContent;

        public ExportExcelModel(List<OrdViewModel> ol)
        {
            MemoryStream memstream = new MemoryStream();

            SpreadsheetDocument XlsxDoc = SpreadsheetDocument.Create(memstream, SpreadsheetDocumentType.Workbook);

            // Add a WorkbookPart to the document.  
            WorkbookPart workbookpart = XlsxDoc.AddWorkbookPart();
            workbookpart.Workbook = new Workbook();

            // Add a WorksheetPart to the WorkbookPart.  
            WorksheetPart worksheetPart = workbookpart.AddNewPart<WorksheetPart>();
            worksheetPart.Worksheet = new Worksheet(new SheetData());

            // Add Sheets to the Workbook.  
            Sheets sheets = XlsxDoc.WorkbookPart.Workbook.AppendChild<Sheets>(new Sheets());

            // Append a new worksheet and associate it with the workbook.  
            Sheet sheet = new Sheet()
            {
                Id = XlsxDoc.WorkbookPart.GetIdOfPart(worksheetPart),
                SheetId = 1,
                Name = "Folha1"
            };
            sheets.Append(sheet);
            Worksheet worksheet = new Worksheet();
            SheetData sheetData = new SheetData();

            // filling the header row

            Row row = new Row();

            Cell cell;

            cell = new Cell()
            {
                CellReference = ExcelReference(0, 0),
                DataType = CellValues.String,
                CellValue = new CellValue("Nb.")
            };

            row.Append(cell);

            // etc. for the other cells in the row

            sheetData.Append(row);

            // filling the body of the excel file

            int rowidx = 1;

            foreach (OrdViewModel ovm in ol)
            {
                row = new Row();
                cell = new Cell()
                {
                    CellReference = ExcelReference(rowidx,0),
                    DataType = CellValues.Number,
                    CellValue = new CellValue(ovm.eID.ToString())
                };

                row.Append(cell);

                // fills the rest of the row ...

                row.Append(cell);

                sheetData.Append(row);

                rowidx++;
            }

            worksheet.Append(sheetData);
            worksheetPart.Worksheet = worksheet;

            // Close the document.  
            XlsxDoc.Close();

            ExcelContent = memstream.ToArray();
        }

        private string ExcelReference(int row, int col)     // only for rows between A-Z
            => ((char) (col + 65)).ToString() + (row + 1).ToString();
     }

来源：https://stackoverflow.com/questions/59825738/exporting-data-to-excel-format-error-when-opening-resulting-file