将DataTable中的数据导出到Excel

public static void Export(System.Data.DataTable dt,NPOI.HSSF.UserModel.HSSFWorkbook workbook,string FilePath)
        {
            if(dt.Rows.Count == 0)
            {
                System.Windows.MessageBox.Show("尚未读取到任何数据");
                return;
            }
            ISheet sheet = workbook.CreateSheet("导出数据");
            HSSFCellStyle styleHeader =(HSSFCellStyle)workbook.CreateCellStyle();
            styleHeader.Alignment = HorizontalAlignment.Center;
            IFont font = workbook.CreateFont();
            font.FontHeight = 20 * 20;
            font.Color = HSSFColor.Red.Index;
            styleHeader.SetFont(font);
            HSSFCellStyle style = (HSSFCellStyle)workbook.CreateCellStyle();
            style.Alignment = HorizontalAlignment.Center;
            using(FileStream fs = new FileStream(FilePath + "\导出数据.xls",FileMode.Create))
            {
                IRow rowHeader = sheet.CreateRow(0);
                for (int col = 0; col < dt.Columns.Count; col++)
                {
                    ICell cellHeader = rowHeader.CreateCell(col);
                    cellHeader.SetCellValue(dt.Columns[col].ColumnName);
                    sheet.SetColumnWidth(col, 30 * 256);
                    cellHeader.CellStyle = styleHeader;
                }
                for (int i = 1; i < dt.Rows.Count; i++)
                {
                    IRow row = sheet.CreateRow(i);
                    for (int j = 0; j < dt.Columns.Count; j++)
                    {
                        ICell cell = row.CreateCell(j);
                        cell.SetCellValue(dt.Rows[i - 1][j].ToString());
                        cell.CellStyle = style;
                    }
                }
                workbook.Write(fs);
                System.Windows.MessageBox.Show("保存成功");
            }
        }