NPOI设置单元格格式

转自：http://www.cr173.com/html/18143_2.html

//创建一个常用的xls文件
        private void button3_Click(object sender, EventArgs e)
        {
            IWorkbook wb = new HSSFWorkbook();
            //创建表
            ISheet sh = wb.CreateSheet("zhiyuan");
            //设置单元的宽度
            sh.SetColumnWidth(,  * );
            sh.SetColumnWidth(,  * );
            sh.SetColumnWidth(,  * );
            sh.SetColumnWidth(,  * );
            int i = ;
            #region 练习合并单元格
            sh.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(, , , ));

            //CellRangeAddress（）该方法的参数次序是：开始行号，结束行号，开始列号，结束列号。

            IRow row0 = sh.CreateRow();
            row0.Height =  * ;
            ICell icell1top0 = row0.CreateCell();
            icell1top0.CellStyle = Getcellstyle(wb, stylexls.头);
            icell1top0.SetCellValue("标题合并单元");
            #endregion
            i++;
            #region 设置表头
            IRow row1 = sh.CreateRow();
            row1.Height =  * ;

            ICell icell1top = row1.CreateCell();
            icell1top.CellStyle = Getcellstyle(wb, stylexls.头);
            icell1top.SetCellValue("网站名");

            ICell icell2top = row1.CreateCell();
            icell2top.CellStyle = Getcellstyle(wb, stylexls.头);
            icell2top.SetCellValue("网址");

            ICell icell3top = row1.CreateCell();
            icell3top.CellStyle = Getcellstyle(wb, stylexls.头);
            icell3top.SetCellValue("百度快照");

            ICell icell4top = row1.CreateCell();
            icell4top.CellStyle = Getcellstyle(wb, stylexls.头);
            icell4top.SetCellValue("百度收录");
            #endregion  

            using(FileStream stm=File.OpenWrite(@"c:/myMergeCell.xls"))
            {
                wb.Write(stm);
                MessageBox.Show("提示：创建成功！");
            }
        }

        #region 定义单元格常用到样式的枚举
        public enum stylexls
        {
            头,
            url,
            时间,
            数字,
            钱,
            百分比,
            中文大写,
            科学计数法,
            默认
        }
        #endregion

        #region 定义单元格常用到样式
        static ICellStyle Getcellstyle(IWorkbook wb, stylexls str)
        {
            ICellStyle cellStyle = wb.CreateCellStyle();

            //定义几种字体
            //也可以一种字体，写一些公共属性，然后在下面需要时加特殊的
            IFont font12 = wb.CreateFont();
            font12.FontHeightInPoints = ;
            font12.FontName = "微软雅黑";

            IFont font = wb.CreateFont();
            font.FontName = "微软雅黑";
            //font.Underline = 1;下划线  

            IFont fontcolorblue = wb.CreateFont();
            fontcolorblue.Color = HSSFColor.OLIVE_GREEN.BLUE.index;
            fontcolorblue.IsItalic = true;//下划线
            fontcolorblue.FontName = "微软雅黑";

            //边框
            cellStyle.BorderBottom = NPOI.SS.UserModel.BorderStyle.DOTTED;
            cellStyle.BorderLeft = NPOI.SS.UserModel.BorderStyle.HAIR;
            cellStyle.BorderRight = NPOI.SS.UserModel.BorderStyle.HAIR;
            cellStyle.BorderTop = NPOI.SS.UserModel.BorderStyle.DOTTED;
            //边框颜色
            cellStyle.BottomBorderColor = HSSFColor.OLIVE_GREEN.BLUE.index;
            cellStyle.TopBorderColor = HSSFColor.OLIVE_GREEN.BLUE.index;

            //背景图形，我没有用到过。感觉很丑
            //cellStyle.FillBackgroundColor = HSSFColor.OLIVE_GREEN.BLUE.index;
            //cellStyle.FillForegroundColor = HSSFColor.OLIVE_GREEN.BLUE.index;
            cellStyle.FillForegroundColor = HSSFColor.WHITE.index;
            // cellStyle.FillPattern = FillPatternType.NO_FILL;
            cellStyle.FillBackgroundColor = HSSFColor.BLUE.index;

            //水平对齐
            cellStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.LEFT;

            //垂直对齐
            cellStyle.VerticalAlignment = VerticalAlignment.CENTER;

            //自动换行
            cellStyle.WrapText = true;

            //缩进;当设置为1时，前面留的空白太大了。希旺官网改进。或者是我设置的不对
            cellStyle.Indention = ;

            //上面基本都是设共公的设置
            //下面列出了常用的字段类型
            switch (str)
            {
                case stylexls.头:
                    // cellStyle.FillPattern = FillPatternType.LEAST_DOTS;
                    cellStyle.SetFont(font12);
                    break;
                case stylexls.时间:
                    IDataFormat datastyle = wb.CreateDataFormat();

                    cellStyle.DataFormat = datastyle.GetFormat("yyyy/mm/dd");
                    cellStyle.SetFont(font);
                    break;
                case stylexls.数字:
                    cellStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat("0.00");
                    cellStyle.SetFont(font);
                    break;
                case stylexls.钱:
                    IDataFormat format = wb.CreateDataFormat();
                    cellStyle.DataFormat = format.GetFormat("￥#,##0");
                    cellStyle.SetFont(font);
                    break;
                case stylexls.url:
                    fontcolorblue.Underline = ;
                    cellStyle.SetFont(fontcolorblue);
                    break;
                case stylexls.百分比:
                    cellStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat("0.00%");
                    cellStyle.SetFont(font);
                    break;
                case stylexls.中文大写:
                    IDataFormat format1 = wb.CreateDataFormat();
                    cellStyle.DataFormat = format1.GetFormat("[DbNum2][$-804]0");
                    cellStyle.SetFont(font);
                    break;
                case stylexls.科学计数法:
                    cellStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat("0.00E+00");
                    cellStyle.SetFont(font);
                    break;
                case stylexls.默认:
                    cellStyle.SetFont(font);
                    break;
            }
            return cellStyle;

        }
        #endregion