ClosedXML DataTable to Excel不会将int(c#)值导出为数字(Excel)

using ClosedXML.Excel;
using System.Data;

public class ExcelExporter
{
    public void ExportToExcel(DataTable dataTable, string filePath)
    {
        using (var workbook = new XLWorkbook())
        {
            var worksheet = workbook.Worksheets.Add("Sheet1");

            // 导出列名
            for (int i = 0; i < dataTable.Columns.Count; i++)
            {
                worksheet.Cell(1, i + 1).Value = dataTable.Columns[i].ColumnName;
            }

            // 导出数据
            for (int i = 0; i < dataTable.Rows.Count; i++)
            {
                for (int j = 0; j < dataTable.Columns.Count; j++)
                {
                    var value = dataTable.Rows[i][j];
                    var cell = worksheet.Cell(i + 2, j + 1);

                    // 设置列的数据类型为数字
                    if (value is int)
                    {
                        cell.SetDataType(XLDataType.Number);
                    }

                    cell.Value = value;
                }
            }

            workbook.SaveAs(filePath);
        }
    }
}

var dataTable = new DataTable();
dataTable.Columns.Add("ID", typeof(int));
dataTable.Columns.Add("Name", typeof(string));

dataTable.Rows.Add(1, "John");
dataTable.Rows.Add(2, "Jane");

var exporter = new ExcelExporter();
exporter.ExportToExcel(dataTable, "output.xlsx");