NPOI操作Excel 003：写入空Excel

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     protected void Btn_WriteExcel(object sender, EventArgs e)
        {
            //要保存的内容，此处用代码生成的内容，而在实际中可以是数据库读取的，
            //亦或是页面输入的内容
            
            DataTable dt = new DataTable();


            dt.Columns.Add("序号");


            dt.Columns.Add("姓名");


            dt.Columns.Add("年龄");


            dt.Columns.Add("职位");


            for (int i = 0; i < 5; i++)
            {
                DataRow row = dt.NewRow();


                row["序号"] = i + 1;


                row["姓名"] = "Test"+i ;


                row["年龄"] = 25 + i;


                row["职位"] = i % 2 == 0 ? "工程师" : "经理";


                dt.Rows.Add(row);
            }
            //为了更好的看如何使用NPOI，此处显示两行标题。
            //显示标题可以看如何合并单元格
            string mainTitle = "主标题";


            string secondTitle = "副标题";


            //保存的Excel路径，文件名用guid生成
            string fileIndex = HttpRuntime.AppDomainAppPath.ToString();


            string tempExcel = fileIndex + @"\ExcelFile\{0}.xls";


            tempExcel = string.Format(tempExcel, System.Guid.NewGuid());


            int rowIndex = 0;
            
            //操作Excel的几个主要对象，此处声明
            HSSFWorkbook workbook = new HSSFWorkbook();


            HSSFSheet sheet = workbook.CreateSheet();


            //row0和row1是两行标题
            HSSFRow row0 = sheet.CreateRow(rowIndex);


            HSSFCell cell0 = row0.CreateCell(0);


            cell0.SetCellValue(mainTitle);


            HSSFCellStyle style = workbook.CreateCellStyle();


            style.Alignment = CellHorizontalAlignment.CENTER;


            HSSFFont font = workbook.CreateFont();


            font.Boldweight = short.MaxValue;


            style.SetFont(font);


            cell0.CellStyle = style;
            //此处合并单元格
            sheet.AddMergedRegion(new NPOI.HSSF.Util.CellRangeAddress(rowIndex,rowIndex,0,5));


            rowIndex++;


            HSSFRow row1 = sheet.CreateRow(rowIndex);


            HSSFCell cell1 = row1.CreateCell(0);


            cell1.SetCellValue(secondTitle);


            cell1.CellStyle = style;


            sheet.AddMergedRegion(new NPOI.HSSF.Util.CellRangeAddress(rowIndex, rowIndex, 0, 5));


            //因为列名已经指定，占一行
            rowIndex++;


            //这一行显示表头
            HSSFRow row2 = sheet.CreateRow(rowIndex);


            int row2cellIndex = 0;


            foreach (DataColumn col in dt.Columns)
            {
                HSSFCell cell = row2.CreateCell(row2cellIndex);


                cell.SetCellValue(col.ColumnName.ToString());


                row2cellIndex++;
            }
            
            rowIndex++;


            //datatable的内容
            for(int i= 0;i< dt.Rows.Count;i++)
            {
                HSSFRow row = sheet.CreateRow(rowIndex);


                foreach (DataColumn col in dt.Columns)
                {
                    row.CreateCell(col.Ordinal).SetCellValue(dt.Rows[i][col].ToString());


                }


                rowIndex++;
            }


            //使用文件流保存
            MemoryStream ms = new MemoryStream();


            workbook.Write(ms);


            ms.Flush();


            ms.Position = 0;


            workbook = null;


            sheet = null;


            FileStream fs = new FileStream(tempExcel,FileMode.Create,FileAccess.ReadWrite);


            ms.WriteTo(fs);


            fs.Close();


            ms.Close();
        }

NPOI操作Excel 003：写入空Excel

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原文地址：http://blog.csdn.net/yysyangyangyangshan/article/details/42837841