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 == )
             {
                 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 =  * ;
             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();
                 for (int col = ; col < dt.Columns.Count; col++)
                 {
                     ICell cellHeader = rowHeader.CreateCell(col);
                     cellHeader.SetCellValue(dt.Columns[col].ColumnName);
                     sheet.SetColumnWidth(col,  * );
                     cellHeader.CellStyle = styleHeader;
                 }
                 for (int i = ; i < dt.Rows.Count; i++)
                 {
                     IRow row = sheet.CreateRow(i);
                     for (int j = ; j < dt.Columns.Count; j++)
                     {
                         ICell cell = row.CreateCell(j);
                         cell.SetCellValue(dt.Rows[i - ][j].ToString());
                         cell.CellStyle = style;
                     }
                 }
                 workbook.Write(fs);
                 System.Windows.MessageBox.Show("保存成功");
             }
         }