NPOI导出数据，设置格式，锁定单元格

　　代码包括：

       1：导出多个sheet    2：设置单元格格式   3:合并单元格   4：下拉框选项   5:输入数字限制   6：锁定单元格

 static void Main(string[] args)
        {
           
            //hssf表示2003   xssf表示2007  两者之间有的功能是一样的，比如设置列宽,锁定单元格
            //有的功能是不一样的,具体情况具体对待

            //实例化一个操作excel工作薄的对象
            IWorkbook workbook = new HSSFWorkbook();
            //创建表
            ISheet sheet1 = workbook.CreateSheet("sheet1");
            //创建行(一行一行的创建,参数代表第几行,不能相同,会覆盖)
            IRow row1 = sheet1.CreateRow(0);
            //创建单元格(一个一个的创建,参数代表第几个,不能相同,会覆盖)
            ICell cell1 = row1.CreateCell(0);
            //设置值
            cell1.SetCellValue("大家好");
            //设置格式
            ICell cell2 = row1.CreateCell(1);
            cell1.SetCellValue("hahah");
            SetCellStyle((HSSFWorkbook)workbook, cell1);
            //合并单元格
            MergeCell(sheet1, 0, 0, 1, 4);
            sheet1.SetColumnWidth(0, 20 * 256);
            sheet1.SetColumnWidth(1, 25 * 256);
            


            //创建另一个sheet
            ISheet sheet2 = workbook.CreateSheet("sheet2");
            SetCellDropdownlist(sheet2);//下拉列表
            SetCellInputNumber(sheet2);//只能输入数字




            //锁定sheet
            ISheet sheet3 = workbook.CreateSheet("sheet3");

            //设置密码，锁定表(只要设定就会锁定整个sheet)
            sheet3.ProtectSheet("123456");
            IRow row3 = sheet3.CreateRow(0);
            ICell c1 = row3.CreateCell(0);

            ICell c2 = row3.CreateCell(1);


            //不锁定
            HSSFCellStyle unlocked = (HSSFCellStyle)workbook.CreateCellStyle();
            unlocked.IsLocked = false;

            //锁定
            HSSFCellStyle locked = (HSSFCellStyle)workbook.CreateCellStyle();
            locked.IsLocked = true;

            c1.SetCellValue("未锁定");
            c1.CellStyle = unlocked;

            //其实这个设置不设置都一样的，只要加密就是锁定整个sheet
            c2.SetCellValue("锁定");
            c2.CellStyle = locked;

            using (Stream stream = File.OpenWrite(@"D:	est2.xls"))
            {
                //进行保存
                workbook.Write(stream);
            }
            Console.WriteLine("成功");
            Console.ReadKey();

        }





        /// <summary>
        /// 设置单元格为下拉框并限制输入值
        /// </summary>
        /// <param name="sheet"></param>
        private static void SetCellDropdownlist(ISheet sheet)
        {
            //设置生成下拉框的行和列(开始行，结束行，开始列，结束列)
            var cellRegions = new CellRangeAddressList(0, 20, 0, 0);

            //设置 下拉框内容
            DVConstraint constraint = DVConstraint.CreateExplicitListConstraint(
                new string[] { "itemA", "itemB", "itemC" });

            //绑定下拉框和作用区域，并设置错误提示信息
            HSSFDataValidation dataValidate = new HSSFDataValidation(cellRegions, constraint);
            dataValidate.CreateErrorBox("输入不合法", "请输入下拉列表中的值。");
            dataValidate.ShowPromptBox = true;

            sheet.AddValidationData(dataValidate);
        }


        /// <summary>
        /// 设置单元格只能输入数字
        /// </summary>
        /// <param name="sheet"></param>
        private static void SetCellInputNumber(ISheet sheet)
        {
            //设置生成下拉框的行和列
            var cellRegions = new CellRangeAddressList(0, 10, 1, 1);

            //第二个参数int comparisonOperator  参考源码获取
            //https://github.com/tonyqus/npoi
            //NPOITest项目
            DVConstraint constraint = DVConstraint.CreateNumericConstraint(
                ValidationType.INTEGER, OperatorType.BETWEEN, "0", "10");

            HSSFDataValidation dataValidate = new HSSFDataValidation(cellRegions, constraint);
            dataValidate.CreateErrorBox("输入不合法", "请输入1~10的数字。");
            //dataValidate.PromptBoxTitle = "ErrorInput";

            sheet.AddValidationData(dataValidate);
        }



        /// <summary>
        /// 合并单元格
        /// </summary>
        /// <param name="sheet"></param>
        /// <param name="firstRow"></param>
        /// <param name="lastRow"></param>
        /// <param name="firstCell"></param>
        /// <param name="lastCell"></param>
        private static void MergeCell(ISheet sheet, int firstRow, int lastRow, int firstCell, int lastCell)
        {
            sheet.AddMergedRegion(new CellRangeAddress(firstRow, lastRow, firstCell, lastCell));//2.0使用 2.0以下为Region
        }



        /// <summary>
        /// 设置单元格样式
        /// </summary>
        /// <param name="workbook"></param>
        /// <param name="cell"></param>
        private static void SetCellStyle(HSSFWorkbook workbook, ICell cell)
        {
            HSSFCellStyle fCellStyle = (HSSFCellStyle)workbook.CreateCellStyle();
            HSSFFont ffont = (HSSFFont)workbook.CreateFont();
            ffont.FontHeight = 20 * 20;
            ffont.FontName = "宋体";
            ffont.Color = HSSFColor.RED.index;

            //2007中直接设置就好
            //ffont.Color = 2;
            fCellStyle.SetFont(ffont);

            fCellStyle.VerticalAlignment = NPOI.SS.UserModel.VerticalAlignment.CENTER;//垂直对齐
            fCellStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.CENTER;//水平对齐
            cell.CellStyle = fCellStyle;
        }

参考

http://www.docin.com/p-1151996737.html?qq-pf-to=pcqq.c2c
http://www.cnblogs.com/gossip/p/4307486.html