NPOI导出Excel文件，对单元格的一些设置

 HSSFWorkbook book = new HSSFWorkbook();
 MemoryStream ms = new MemoryStream();
 ISheet sheet = book.CreateSheet("sheet1");
 ICellStyle cellStyle = book.CreateCellStyle();
 
 // 首列
 NPOI.SS.UserModel.IRow row1 = sheet.CreateRow();
 row1.CreateCell().SetCellValue(System.DateTime.Now.Year+"年XXXX");
 //设置单元格的样式：水平对齐居中
 row1.Cells[].CellStyle.VerticalAlignment = VerticalAlignment.Justify;//垂直对齐(默认应该为center，如果center无效则用justify)
 row1.Cells[].CellStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;//水平对齐
 CellRangeAddress cellRangeAddress = new CellRangeAddress(, , , );//开始行的索引,结束行的索引,开始列的索引,结束列的索引
 
 sheet.AddMergedRegion(cellRangeAddress);//要合并单元格所在的sheet

参考网址：http://www.jb51.net/article/36002.htm

   NPOI.SS.UserModel.IRow row = sheet.CreateRow();
             row.CreateCell().SetCellValue("序号");
             row.CreateCell().SetCellValue("单位");
             row.CreateCell().SetCellValue("姓名");
             row.CreateCell().SetCellValue("性别");
             row.CreateCell().SetCellValue("年龄");
             row.CreateCell().SetCellValue("民族");
             row.CreateCell().SetCellValue("培训班名称");
             row.CreateCell().SetCellValue("电报号");
             row.CreateCell().SetCellValue("培训时间");
             sheet.SetColumnWidth(,  * );//设置列宽
             sheet.SetColumnWidth(, *);
             sheet.SetColumnWidth(,  * );
             sheet.SetColumnWidth(, *);

参考网址：http://www.jb51.net/article/55407.htm