C# OpenXML确定值是数字还是共享字符串

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

public static void DetermineValueType(string filePath, string sheetName, string cellReference)
{
    using (SpreadsheetDocument document = SpreadsheetDocument.Open(filePath, false))
    {
        WorkbookPart workbookPart = document.WorkbookPart;
        Sheet sheet = workbookPart.Workbook.Descendants<Sheet>().FirstOrDefault(s => s.Name == sheetName);
        
        if (sheet != null)
        {
            WorksheetPart worksheetPart = (WorksheetPart)workbookPart.GetPartById(sheet.Id);
            Cell cell = worksheetPart.Worksheet.Descendants<Cell>().FirstOrDefault(c => c.CellReference == cellReference);
            
            if (cell != null)
            {
                if (cell.DataType != null && cell.DataType.Value == CellValues.SharedString)
                {
                    int sharedStringIndex = int.Parse(cell.InnerText);
                    SharedStringTablePart sharedStringPart = workbookPart.SharedStringTablePart;
                    string sharedStringValue = sharedStringPart.SharedStringTable.Elements<SharedStringItem>().ElementAt(sharedStringIndex).InnerText;
                    
                    Console.WriteLine("Value is a shared string: " + sharedStringValue);
                }
                else
                {
                    double numericValue = double.Parse(cell.InnerText);
                    Console.WriteLine("Value is a number: " + numericValue);
                }
            }
        }
    }
}