ASP.Net M5C利用NPOI导入导出Excel的示例代码

这篇文章主要介绍了ASP.Net MVC利用NPOI导入导出Excel的问题记录，本文给大家介绍的非常详细，对大家的学习或工作具有一定的参考借鉴价值,需要的朋友可以参考下

什么是NPOI

该项目是位于http://poi.a*p*a*che.org/的POI Java项目的.NET版本。POI是一个开源项目，可以帮助您读取/写入xls，doc，ppt文件。它有着广泛的应用。本文给大家介绍ASP.Net MVC利用NPOI导入导出Excel的问题。

因近期项目遇到所以记录一下：

首先导出Excel：

首先引用NPOI包

（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sheetNPOI.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：

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

下面说一下导入：

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;}#endregionusing (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 = PhysicalNumberOfCellsint 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){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;}}

补充一个类

/// <summary>/// 根据Excel列类型获取列的值/// </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 the cell. NumericCellValue will return a numeric value no matter the cell value is a 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{return cell.NumericCellValue.ToString();}}}

得到DataTable后，就想怎么操作就怎么操作了

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