原文連結

因近期專案遇到所以記錄一下：

首先匯出Excel ：

首先引用NPOI包

（Action一定要用FileResult）

/// <summary>/// 批量匯出本校第一批派位學生/// </summary>/// <returns></returns>public FileResult ExportStu2()
    {
      string schoolname = "401";
      //建立Excel檔案的物件
      NPOI.HSSF.UserModel.HSSFWorkbookbook = newNPOI.HSSF.UserModel.HSSFWorkbook();
     

前臺直接寫就可實現：

1、  @Html.ActionLink("點選匯出名冊", "ExportStu2")

下面說一下匯出：

首先說一些前臺吧，mvc上傳注意必須加 new{ enctype = "multipart/form-data" }：

<td>2、@using(@Html.BeginForm("ImportStu", "ProSchool", FormMethod.Post, new { enctype = "multipart/form-data" }))
                        {
                        <text>選擇上傳檔案：（工作表名為“Sheet1”，“電腦號”在A1單元格。）</text><input name="file" type="file"id="file" /><input type="submit" name="Upload" value="批量匯入第一批電腦派位名冊" />
                        }
                    </td>

後臺實現：只傳路徑得出DataTable：

/// <summary>/// Excel匯入/// </summary>/// <paramname="filePath"></param>/// <returns></returns>public DataTable ImportExcelFile(string filePath)
    {
      HSSFWorkbookhssfworkbook;
      #region//初始化資訊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);//第一行為標題行int cellCount = headerRow.LastCellNum;//LastCellNum =PhysicalNumberOfCellsint rowCount = sheet.LastRowNum;//LastRowNum = PhysicalNumberOfRows - 1

//handling header.for (int i= headerRow.FirstCellNum; i < cellCount; i++)
        {
          DataColumn column = newDataColumn(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)
          {
            for (int j = row.FirstCellNum; j < cellCount; j++)
            {
              if (row.GetCell(j) != null)
                dataRow[j] = GetCellValue(row.GetCell(j));
            }
          }

table.Rows.Add(dataRow);
        }
        return table;
      }
     
    }

補充一個類

/// <summary>/// 根據Excel列型別獲取列的值/// </summary>/// <param name="cell">Excel列</param>/// <returns></returns>private static string GetCellValue(ICell cell)
    {
      if (cell == null)
        return string.Empty;
      switch (cell.CellType)
      {
        case CellType.BLANK:
          return string.Empty;
        case CellType.BOOLEAN:
          return cell.BooleanCellValue.ToString();
        case CellType.ERROR:
          return cell.ErrorCellValue.ToString();
        case CellType.NUMERIC:
        case CellType.Unknown:
        default:
          return cell.ToString();//This is a trick to get the correct value of thecell. NumericCellValue will return a numeric value no matter the cell value isa date or a numbercase CellType.STRING:
          return cell.StringCellValue;
        case CellType.FORMULA:
          try
          {
            HSSFFormulaEvaluator e = new HSSFFormulaEvaluator(cell.Sheet.Workbook);
           e.EvaluateInCell(cell);
            return cell.ToString();
          }
          catch
          {
            returncell.NumericCellValue.ToString();
          }
      }
    }

得到DataTable後，就想怎麼操作就怎麼操作了