C# 通过NPOI导入导出数据EXCEL

其实从数据库到服务器导入导出有很多方法,但是比较简单的有NPOI这个方法

 准备工作,先增加到相应的lib ,同时引用相关的dll 

第一从数据库导出数据到Excel里面

首先我设置一个win窗体

第二步写代码

  private void button1_Click(object sender, EventArgs e)
        {
            //查询数据,显示到表格上
            ManagerInfoBll miBll = new ManagerInfoBll();
            var list = miBll.GetList();
            dataGridView1.DataSource = list;
            //进行excel 生成创建操作
            //1 创建workboook ,不指定参数,表示创建一个新的工作本
            HSSFWorkbook workbook = new HSSFWorkbook();
            //2创建sheet
            HSSFSheet sheet = workbook.CreateSheet("管理员");
            //3创建row
            HSSFRow row = sheet.CreateRow(0);
            //4创建cell
            HSSFCell cell0 = row.CreateCell(0);
            cell0.SetCellValue("管理员表");
            //5设置合并单元格
            sheet.AddMergedRegion(new NPOI.HSSF.Util.Region(0, 0, 0, 3));

            //6设置居中
            HSSFCellStyle styleTitle = workbook.CreateCellStyle();       
            styleTitle.Alignment = 2;
            cell0.CellStyle = styleTitle;
            //6.1设置字体
            HSSFFont fontTitle = workbook.CreateFont();
            fontTitle.FontHeightInPoints = 14;
            styleTitle.SetFont(fontTitle);



            //7创建标题行
            //7.1创建行
            HSSFRow rowTitle = sheet.CreateRow(1);
           
            //7.2创建单元格
            HSSFCell cellTitle0 = rowTitle.CreateCell(0);
            cellTitle0.SetCellValue("编号");
            cellTitle0.CellStyle = styleTitle;


            HSSFCell cellTitle1 = rowTitle.CreateCell(1);
            cellTitle1.SetCellValue("姓名");
            cellTitle1.CellStyle = styleTitle;

            HSSFCell cellTitle2 = rowTitle.CreateCell(2);
            cellTitle2.SetCellValue("密码");
            cellTitle2.CellStyle = styleTitle;


            HSSFCell cellTitle3 = rowTitle.CreateCell(3);         
            cellTitle3.SetCellValue("类型");
            cellTitle3.CellStyle = styleTitle;

  

           

            int rowIndex = 2;

            //8.1遍历集合
            foreach (var mi in list)
            {//8.2创建行
                HSSFRow rowData = sheet.CreateRow(rowIndex++);
                //8.3创建单元格
                HSSFCell cellData0 = rowData.CreateCell(0);
                cellData0.SetCellValue(mi.MId);


                HSSFCell cellData1 = rowData.CreateCell(1);
                cellData1.SetCellValue(mi.MName);

                HSSFCell cellData2 = rowData.CreateCell(2);
                cellData2.SetCellValue(mi.MPwd);

                HSSFCell cellData3 = rowData.CreateCell(3);
                cellData0.SetCellValue(mi.MType==1?"经理":"店员");
            }  


      //8 保持文本
            FileStream stream = new FileStream("", FileMode.Create);

            workbook.Write(stream);// 
            stream.Close();
            stream.Dispose();

                
            
        }

最后效果

第二从Excel导入到数据库中

 private void button2_Click(object sender, EventArgs e)
        {

            //1读取excel 数据,存入list 
            List list = new List();
            //1.1读取文件                            路径
            using (FileStream stream= new FileStream("",FileMode.Open))
            {
                //1.2创建workbook
                HSSFWorkbook workbook = new HSSFWorkbook(stream);

                //1.3读取sheet
                HSSFSheet sheet = workbook.GetSheetAt(0);


                //1.4读取正文数据主要从表格开始看起 第三行开始
                int rowindex = 2;
                HSSFRow row = sheet.GetRow(10);
                while ( row==null)
                {
                    //1.5读到数据返回行对象
                    ManagerInfo mi = new ManagerInfo();
                    mi.MId = (int)row.GetCell(0).NumericCellValue;
                    mi.MName = row.GetCell(1).StringCellValue;
                    mi.MPwd = row.GetCell(2).StringCellValue;
                    mi.MType=row.GetCell(3).StringCellValue=="经理"?1 : 0;
                    list.Add(mi);
                    row = sheet.GetRow(rowindex++);
                }
               

            }
            //2将list赋值给dataGridview
            dataGridView1.DataSource = list;
        }