Home > Article > Backend Development > C# programming Excel import and export (source code download) (Part 2)
3. Excel导出
3.1 导出流程
3.2 NPOI操作代码
说明:把List
步骤:
①创建一个工作簿(Workbook);
②在工作簿上创建一个工作表(Sheet);
③在工作表上创建第一行(row),第一行为列头,依次写入cellHeard的值(做为列名)。
④循环遍历List
代码:
/// <summary> /// 实体类集合导出到Excle2003 /// </summary> /// <param name="cellHeard">单元头的Key和Value:{ { "UserName", "姓名" }, { "Age", "年龄" } };</param> /// <param name="enList">数据源</param> /// <param name="sheetName">工作表名称</param> /// <returns>文件的下载地址</returns> public static string EntityListToExcel2003(Dictionary<string, string> cellHeard, IList enList, string sheetName) { try { string fileName = sheetName + "-" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + ".xls"; // 文件名称 string urlPath = "UpFiles/ExcelFiles/" + fileName; // 文件下载的URL地址,供给前台下载 string filePath = HttpContext.Current.Server.MapPath("\\" + urlPath); // 文件路径 // 1.检测是否存在文件夹,若不存在就建立个文件夹 string directoryName = Path.GetDirectoryName(filePath); if (!Directory.Exists(directoryName)) { Directory.CreateDirectory(directoryName); } // 2.解析单元格头部,设置单元头的中文名称 HSSFWorkbook workbook = new HSSFWorkbook(); // 工作簿 ISheet sheet = workbook.CreateSheet(sheetName); // 工作表 IRow row = sheet.CreateRow(0); List<string> keys = cellHeard.Keys.ToList(); for (int i = 0; i < keys.Count; i++) { row.CreateCell(i).SetCellValue(cellHeard[keys[i]]); // 列名为Key的值 } // 3.List对象的值赋值到Excel的单元格里 int rowIndex = 1; // 从第二行开始赋值(第一行已设置为单元头) foreach (var en in enList) { IRow rowTmp = sheet.CreateRow(rowIndex); for (int i = 0; i < keys.Count; i++) // 根据指定的属性名称,获取对象指定属性的值 { string cellValue = ""; // 单元格的值 object properotyValue = null; // 属性的值 System.Reflection.PropertyInfo properotyInfo = null; // 属性的信息 // 3.1 若属性头的名称包含'.',就表示是子类里的属性,那么就要遍历子类,eg:UserEn.UserName if (keys[i].IndexOf(".") >= 0) { // 3.1.1 解析子类属性(这里只解析1层子类,多层子类未处理) string[] properotyArray = keys[i].Split(new string[] { "." }, StringSplitOptions.RemoveEmptyEntries); string subClassName = properotyArray[0]; // '.'前面的为子类的名称 string subClassProperotyName = properotyArray[1]; // '.'后面的为子类的属性名称 System.Reflection.PropertyInfo subClassInfo = en.GetType().GetProperty(subClassName); // 获取子类的类型 if (subClassInfo != null) { // 3.1.2 获取子类的实例 var subClassEn = en.GetType().GetProperty(subClassName).GetValue(en, null); // 3.1.3 根据属性名称获取子类里的属性类型 properotyInfo = subClassInfo.PropertyType.GetProperty(subClassProperotyName); if (properotyInfo != null) { properotyValue = properotyInfo.GetValue(subClassEn, null); // 获取子类属性的值 } } } else { // 3.2 若不是子类的属性,直接根据属性名称获取对象对应的属性 properotyInfo = en.GetType().GetProperty(keys[i]); if (properotyInfo != null) { properotyValue = properotyInfo.GetValue(en, null); } } // 3.3 属性值经过转换赋值给单元格值 if (properotyValue != null) { cellValue = properotyValue.ToString(); // 3.3.1 对时间初始值赋值为空 if (cellValue.Trim() == "0001/1/1 0:00:00" || cellValue.Trim() == "0001/1/1 23:59:59") { cellValue = ""; } } // 3.4 填充到Excel的单元格里 rowTmp.CreateCell(i).SetCellValue(cellValue); } rowIndex++; } // 4.生成文件 FileStream file = new FileStream(filePath, FileMode.Create); workbook.Write(file); file.Close(); // 5.返回下载路径 return urlPath; } catch (Exception ex) { throw ex; } }
3.3 C#逻辑操作代码
说明:对Excel转换后的List
步骤:
①获取List
②调用3.2,将List
③服务器存储Excel文件并返回下载链接。
代码:
public void ExportExcel(HttpContext context) { try { // 1.获取数据集合 List<UserEntity> enlist = new List<UserEntity>() { new UserEntity{Name="刘一",Age=22,Gender="Male",TranscriptsEn=new TranscriptsEntity{ChineseScores=80,MathScores=90}}, new UserEntity{Name="陈二",Age=23,Gender="Male",TranscriptsEn=new TranscriptsEntity{ChineseScores=81,MathScores=91} }, new UserEntity{Name="张三",Age=24,Gender="Male",TranscriptsEn=new TranscriptsEntity{ChineseScores=82,MathScores=92} }, new UserEntity{Name="李四",Age=25,Gender="Male",TranscriptsEn=new TranscriptsEntity{ChineseScores=83,MathScores=93} }, new UserEntity{Name="王五",Age=26,Gender="Male",TranscriptsEn=new TranscriptsEntity{ChineseScores=84,MathScores=94} }, }; // 2.设置单元格抬头 // key:实体对象属性名称,可通过反射获取值 // value:Excel列的名称 Dictionary<string, string> cellheader = new Dictionary<string, string> { { "Name", "姓名" }, { "Age", "年龄" }, { "GenderName", "性别" }, { "TranscriptsEn.ChineseScores", "语文成绩" }, { "TranscriptsEn.MathScores", "数学成绩" }, }; // 3.进行Excel转换操作,并返回转换的文件下载链接 string urlPath = ExcelHelper.EntityListToExcel2003(cellheader, enlist, "学生成绩"); System.Web.Script.Serialization.JavaScriptSerializer js = new System.Web.Script.Serialization.JavaScriptSerializer(); context.Response.ContentType = "text/plain"; context.Response.Write(js.Serialize(urlPath)); // 返回Json格式的内容 } catch (Exception ex) { throw ex; } }
3.4 代码分析
核心代码主要是cellheader与List
4. 源码下载
4.1 运行图
4.2 下载地址
百度网盘: http://pan.baidu.com/s/1o69We8M
CSDN:http://download.csdn.net/download/polk6/8974195
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