因近期项目遇到所以记录一下：

首先导出Excel ：

首先引用NPOI包

http://pan.baidu.com/s/1i3Fosux

（Action一定要用FileResult）

/// <summary>
    /// 批量导出本校第一批派位学生
    /// </summary>
    /// <returns></returns>
    public FileResult ExportStu2()
    {
      string schoolname = "401";
      //创建Excel文件的对象
      NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook();
      //添加一个sheet
      NPOI.SS.UserModel.ISheet sheet1 = book.CreateSheet("Sheet1");
      //获取list数据
      List<TB_STUDENTINFOModel> listRainInfo = m_BLL.GetSchoolListAATQ(schoolname);
      //给sheet1添加第一行的头部标题
      NPOI.SS.UserModel.IRow row1 = sheet1.CreateRow(0);
      row1.CreateCell(0).SetCellValue("电脑号");
      row1.CreateCell(1).SetCellValue("姓名");
      //将数据逐步写入sheet1各个行
      for (int i = 0; i < listRainInfo.Count; i++)
      {
        NPOI.SS.UserModel.IRow rowtemp = sheet1.CreateRow(i + 1);
        rowtemp.CreateCell(0).SetCellValue(listRainInfo[i].ST_CODE.ToString());
        rowtemp.CreateCell(1).SetCellValue(listRainInfo[i].ST_NAME.ToString());
      }
      // 写入到客户端 
      System.IO.MemoryStream ms = new System.IO.MemoryStream();
      book.Write(ms);
      ms.Seek(0, SeekOrigin.Begin);
      return File(ms, "application/vnd.ms-excel", "第一批电脑派位生名册.xls");
    }

前台直接写就可实现：

1、  @Html.ActionLink("点击导出名册", "ExportStu2")

下面说一下导出：

首先说一些前台吧，mvc上传注意必须加 new { enctype = "multipart/form-data" }：

<td>
                       2、@using(@Html.BeginForm("ImportStu", "ProSchool", FormMethod.Post, new { enctype = "multipart/form-data" }))
                        {
                        <text>选择上传文件：（工作表名为“Sheet1”，“电脑号”在A1单元格。）</text>
                        <input name="file" type="file" id="file" />
                        <input type="submit" name="Upload" value="批量导入第一批电脑派位名册" />
                        }
                    </td>

后台实现：只传路径得出DataTable：

/// <summary>
    /// Excel导入
    /// </summary>
    /// <param name="filePath"></param>
    /// <returns></returns>
    public DataTable ImportExcelFile(string filePath)
    {
      HSSFWorkbook hssfworkbook;
      #region//初始化信息
      try
      {
        using (FileStream file = new FileStream(filePath, FileMode.Open, FileAccess.Read))
        {
          hssfworkbook = new HSSFWorkbook(file);
        }
      }
      catch (Exception e)
      {
        throw e;
      }
      #endregion

      using (NPOI.SS.UserModel.ISheet sheet = hssfworkbook.GetSheetAt(0))
      {
        DataTable table = new DataTable();
        IRow headerRow = sheet.GetRow(0);//第一行为标题行
        int cellCount = headerRow.LastCellNum;//LastCellNum = PhysicalNumberOfCells
        int rowCount = sheet.LastRowNum;//LastRowNum = PhysicalNumberOfRows - 1

        //handling header.
        for (int i = headerRow.FirstCellNum; i < cellCount; i++)
        {
          DataColumn column = new DataColumn(headerRow.GetCell(i).StringCellValue);
          table.Columns.Add(column);
        }
        for (int i = (sheet.FirstRowNum + 1); i <= rowCount; i++)
        {
          IRow row = sheet.GetRow(i);
          DataRow dataRow = table.NewRow();

          if (row != null