NPOI

using NPOI.HSSF.UserModel;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using NPOI.SS.UserModel;
using NPOI.HSSF.Util;
using NPOI.HPSF;
using NPOI.SS.Util;

namespace NPOI
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            #region 写
            //xls
            HSSFWorkbook wk = new HSSFWorkbook();
            //表
            ISheet tb = wk.CreateSheet("QWER");
            for (int i = 0; i < 20; i++)
            {
                IRow row = tb.CreateRow(i);
                row.Height = 200 * 2;
                for (int j = 0; j < 5; j++)
                {
                    ICell cell = row.CreateCell(j);
                    switch (j)
                    {
                        case 0:
                            HSSFCellStyle styleF = (HSSFCellStyle)wk.CreateCellStyle();
                            HSSFFont font = (HSSFFont)wk.CreateFont();
                            font.FontName = "宋体";//字体  
                            font.FontHeightInPoints = 14;//字号  
                            font.Color = HSSFColor.PaleBlue.Index;//颜色  
                            //font.Underline = NPOI.SS.UserModel.FontUnderlineType.Double;//下划线  
                            //font.IsStrikeout = true;//删除线  
                            //font.IsItalic = true;//斜体  
                            styleF.SetFont(font);
                            cell.CellStyle = styleF;
                            cell.SetCellValue("q");
                            
                            tb.SetColumnWidth(j, 10 * 256);
                            break;
                        case 1:
                            ICellStyle colorstyle = wk.CreateCellStyle();
                            colorstyle.FillForegroundColor = NPOI.HSSF.Util.HSSFColor.Red.Index;
                            colorstyle.FillPattern = FillPattern.SolidForeground;
                            cell.CellStyle = colorstyle;

                            cell.SetCellValue("w");
                            tb.SetColumnWidth(j, 20 * 256);
                            break;
                        case 2:
                            cell.SetCellValue("e");
                            tb.SetColumnWidth(j, 30 * 256);
                            break;
                        case 3:
                            cell.SetCellValue("r");
                            tb.SetColumnWidth(j, 40 * 256);
                            break;
                        case 4:
                            cell.SetCellValue("t");
                            tb.SetColumnWidth(j, 50 * 256);
                            break;
                    }
                }
            }
            string path = "E://项目//练习//" + DateTime.Now.ToString("yyyyMMddHHmms") + ".xls";
            using (FileStream fs = File.OpenWrite(path))
            {
                wk.Write(fs);
                MessageBox.Show("创建成功");
            }
            #endregion


        }

        private void button2_Click(object sender, EventArgs e)
        {
            #region 读
            StringBuilder sbr = new StringBuilder();
            using (FileStream fs = File.OpenRead(@"d:/myxls.xls"))   //打开xls文件
            {
                HSSFWorkbook wk = new HSSFWorkbook(fs);   //把xls文件中的数据写入wk中
                for (int i = 0; i < wk.NumberOfSheets; i++)  //NumberOfSheets是myxls.xls中总共的表数
                {
                    ISheet sheet = wk.GetSheetAt(i);   //读取当前表数据
                    for (int j = 0; j <= sheet.LastRowNum; j++)  //LastRowNum 是当前表的总行数
                    {
                        IRow row = sheet.GetRow(j);  //读取当前行数据
                        if (row != null)
                        {
                            sbr.Append("-------------------------------------\r\n"); //读取行与行之间的提示界限
                            for (int k = 0; k <= row.LastCellNum; k++)  //LastCellNum 是当前行的总列数
                            {
                                ICell cell = row.GetCell(k);  //当前表格
                                if (cell != null)
                                {
                                    sbr.Append(cell.ToString());   //获取表格中的数据并转换为字符串类型
                                }
                            }
                        }
                    }
                }
            } 
            #endregion
        }

        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(0, 15 * 256);
            sh.SetColumnWidth(1, 35 * 256);
            sh.SetColumnWidth(2, 15 * 256);
            sh.SetColumnWidth(3, 10 * 256);
            

            int i = 0;
            #region 练习合并单元格
            sh.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(0, 0, 0, 3));

            //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(0);
            row0.Height = 20 * 20;
            ICell icell1top0 = row0.CreateCell(0);
            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(1);
            row1.Height = 20 * 20;

            ICell icell1top = row1.CreateCell(0);
            icell1top.CellStyle = Getcellstyle(wb, stylexls.头);
            icell1top.SetCellValue("网站名");

            ICell icell2top = row1.CreateCell(1);
            icell2top.CellStyle = Getcellstyle(wb, stylexls.头);
            icell2top.SetCellValue("网址");

            ICell icell3top = row1.CreateCell(2);
            icell3top.CellStyle = Getcellstyle(wb, stylexls.头);
            icell3top.SetCellValue("百度快照");

            ICell icell4top = row1.CreateCell(3);
            icell4top.CellStyle = Getcellstyle(wb, stylexls.头);
            icell4top.SetCellValue("百度收录");
            #endregion

            using (FileStream stm = File.OpenWrite(@"d:/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 = 10;
            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.OliveGreen.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.OliveGreen.Blue.Index;
            cellStyle.TopBorderColor = HSSFColor.OliveGreen.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 = 0;

            //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 = 1;
                //    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

        private void button4_Click(object sender, EventArgs e)
        {

        }

    }
}