在将ExcelReaderFactory.CreateOpenXmlReader（）与通过代码创建的.xlsx文件一起使用时，出现NullReferenceException

Question

由于某些原因，ExcelReaderFactory.CreateOpenXmlReader()在尝试读取由代码创建的.xlsx文件时抛出NullReferenceException。对于文档创建，我使用OpenXml库。这是创建在我的代码中使用的.xlsx的方法：

public void CreateExcelFile(string filePath, string[][] rowsData)
{
    using (SpreadsheetDocument spreedDocument = SpreadsheetDocument.Create(filePath, SpreadsheetDocumentType.Workbook))
    {
        WorkbookPart workbookPart = spreedDocument.WorkbookPart;
        if (workbookPart == null)
        {
            workbookPart = spreedDocument.AddWorkbookPart();
            workbookPart.Workbook = new Workbook();
        }
        var worksheetPart = workbookPart.AddNewPart<WorksheetPart>();
        var sheetData = new SheetData();
        worksheetPart.Worksheet = new Worksheet(sheetData);
        if (workbookPart.Workbook.Sheets == null)
        {
            workbookPart.Workbook.AppendChild(new Sheets());
        }
        var sheet = new Sheet()
        {
            Id = workbookPart.GetIdOfPart(worksheetPart),
            SheetId = 1,
            Name = "Sheet1"
        };
        var excelRowIndex = 1;
        foreach (var row in rowsData)
        {
            var excelRow = new Row {RowIndex = (UInt32) excelRowIndex};
            foreach (var value in row)
            {
                excelRow.AppendChild(AddCellWithText(value));
            }
            sheetData.AppendChild(excelRow);
            excelRowIndex++;
        }
        workbookPart.Workbook.Sheets.Append(sheet);
        workbookPart.Workbook.Save();
    }
}

public static Cell AddCellWithText(string text)
{
    var cell = new Cell {DataType = CellValues.InlineString};
    var inlineString = new InlineString();
    var cellText = new Text {Text = text};
    inlineString.AppendChild(cellText);
    cell.AppendChild(inlineString);
    return cell;
}

此问题仅发生于由代码生成的.xlsx文件。对于在Excel中创建的文档，一切正常。因此，我认为文件生成中存在一些问题。 有任何想法吗？

更新：这是发生异常的代码：

static DataSet ReadExcelFile(string filePath, bool isFirstRowColumnNames = false) 
{ 
    DataSet result; 
    using (var fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)) 
    { 
         using (var excelReader = ExcelReaderFactory.CreateOpenXmlReader(fs))
         // ...