//創建xls文件
        private void button1_Click(object sender, EventArgs e)
        {
            //創建工作薄
            HSSFWorkbook wk = new HSSFWorkbook();
            //創建一個名稱為mySheet的表
            ISheet tb = wk.CreateSheet("mySheet");
            //創建一行，此行為第二行
            IRow row = tb.CreateRow(1);
            for (int i = 0; i < 20; i++)   
            {
                ICell cell = row.CreateCell(i);  //在第二行中創建單元格
                cell.SetCellValue(i);//循環往第二行的單元格中添加數據
            }
            using (FileStream fs = File.OpenWrite(@"c:/myxls.xls")) //打開一個xls文件，如果沒有則自行創建，如果存在myxls.xls文件則在創建是不要打開該文件！
            {
                wk.Write(fs);   //向打開的這個xls文件中寫入mySheet表并保存。
                MessageBox.Show("提示：創建成功！");
            }
        }

//讀取xls文件
        private void button2_Click(object sender, EventArgs e)
        {   StringBuilder sbr = new StringBuilder();
            using (FileStream fs = File.OpenRead(@"c:/myxls.xls"))   //打開myxls.xls文件
            {
                HSSFWorkbook wk = new HSSFWorkbook(fs);   //把xls文件中的數據寫入wk中
                for (int i = 0; i < wk.NumberOfSheets; i++)  //NumberOfSheets是myxls.xls中總共的表數
                {
                    ISheet sheet = wk.GetSheetAt(i);   //讀取當前表數據
                    for (int j = 0; j <= sheet.LastRowNum; j++)  //LastRowNum 是當前表的總行數
                    {
                        IRow row = sheet.GetRow(j);  //讀取當前行數據
                        if (row != null)
                        {
                            sbr.Append("-------------------------------------/r/n"); //讀取行與行之間的提示界限
                            for (int k = 0; k <= row.LastCellNum; k++)  //LastCellNum 是當前行的總列數
                            {
                                ICell cell = row.GetCell(k);  //當前表格
                                if (cell != null)
                                {                                  
                                    sbr.Append(cell.ToString());   //獲取表格中的數據并轉換為字符串類型
                                }
                            }
                        }
                    }
                }              
            }
            sbr.ToString();
            using (StreamWriter wr = new StreamWriter(new FileStream(@"c:/myText.txt", FileMode.Append)))  //把讀取xls文件的數據寫入myText.txt文件中
            {
                wr.Write(sbr.ToString());
                wr.Flush();
            }

        }

//創建一個常用的xls文件
        private void button3_Click(object sender, EventArgs e)
        {         
            IWorkbook wb = new HSSFWorkbook();
            //創建表 
            ISheet sh = wb.CreateSheet("zhiyuan");
            //設置單元的寬度 
            sh.SetColumnWidth(0, 15 * 256);
            sh.SetColumnWidth(1, 35 * 256);
            sh.SetColumnWidth(2, 15 * 256);
            sh.SetColumnWidth(3, 10 * 256);
            int i = 0;
            #region 練習合并單元格
            sh.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(0, 0, 0, 3));

            //CellRangeAddress（）該方法的參數次序是：開始行號，結束行號，開始列號，結束列號。

            IRow row0 = sh.CreateRow(0);
            row0.Height = 20 * 20;
            ICell icell1top0 = row0.CreateCell(0);
            icell1top0.CellStyle = Getcellstyle(wb, stylexls.頭);
            icell1top0.SetCellValue("標題合并單元");
            #endregion
            i++;
            #region 設置表頭
            IRow row1 = sh.CreateRow(1);
            row1.Height = 20 * 20;

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

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

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

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

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

 

        #region 定義單元格常用到樣式的枚舉
        public enum stylexls
        {
            頭,
            url,
            時間,
            數字,
            錢,
            百分比,
            中文大寫,
            科學計數法,
            默認
        }
        #endregion

        #region 定義單元格常用到樣式
        static ICellStyle Getcellstyle(IWorkbook wb, stylexls str)
        {
            ICellStyle cellStyle = wb.CreateCellStyle();

            //定義幾種字體 
            //也可以一種字體，寫一些公共屬性，然后在下面需要時加特殊的 
            IFont font12 = wb.CreateFont();
            font12.FontHeightInPoints = 10;
            font12.FontName = "微軟雅黑";

            IFont font = wb.CreateFont();
            font.FontName = "微軟雅黑";
            //font.Underline = 1;下劃線 

            IFont fontcolorblue = wb.CreateFont();
            fontcolorblue.Color = HSSFColor.OLIVE_GREEN.BLUE.index;
            fontcolorblue.IsItalic = true;//下劃線 
            fontcolorblue.FontName = "微軟雅黑";

            //邊框 
            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;
            //邊框顏色 
            cellStyle.BottomBorderColor = HSSFColor.OLIVE_GREEN.BLUE.index;
            cellStyle.TopBorderColor = HSSFColor.OLIVE_GREEN.BLUE.index;

            //背景圖形，我沒有用到過。感覺很丑 
            //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;

            //水平對齊 
            cellStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.LEFT;

            //垂直對齊 
            cellStyle.VerticalAlignment = VerticalAlignment.CENTER;

            //自動換行 
            cellStyle.WrapText = true;

            //縮進;當設置為1時，前面留的空白太大了。希旺官網改進。或者是我設置的不對 
            cellStyle.Indention = 0;

            //上面基本都是設共公的設置 
            //下面列出了常用的字段類型 
            switch (str)
            {
                case stylexls.頭:
                    // cellStyle.FillPattern = FillPatternType.LEAST_DOTS; 
                    cellStyle.SetFont(font12);
                    break;
                case stylexls.時間:
                    IDataFormat datastyle = wb.CreateDataFormat();

                    cellStyle.DataFormat = datastyle.GetFormat("yyyy/mm/dd");
                    cellStyle.SetFont(font);
                    break;
                case stylexls.數字:
                    cellStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat("0.00");
                    cellStyle.SetFont(font);
                    break;
                case stylexls.錢:
                    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.中文大寫:
                    IDataFormat format1 = wb.CreateDataFormat();
                    cellStyle.DataFormat = format1.GetFormat("[DbNum2][$-804]0");
                    cellStyle.SetFont(font);
                    break;
                case stylexls.科學計數法:
                    cellStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat("0.00E+00");
                    cellStyle.SetFont(font);
                    break;
                case stylexls.默認:
                    cellStyle.SetFont(font);
                    break;
            }
            return cellStyle;

        }
        #endregion