使用NOPI导入Excel文档

NOPI版本：2.3.0,依赖于NPOI的SharpZipLib版本：0.86,经测试适用于.net4.0+

记录遇到的几个问题

1. NOPI中的IWorkbook接口：xls使用HSSFWorkbook类实现，xlsx使用XSSFWorkbook类实现
2. 日期转换，判断row.GetCell(j).CellType == NPOI.SS.UserModel.CellType.Numeric && HSSFDateUtil.IsCellDateFormatted(row.GetCell(j)
   不能直接使用row.GetCell(j).DateCellValue,这玩意会直接抛出异常来~

1. 将文件流转换为DataTable

    /// <summary>/// 根据Excel格式读取Excel/// </summary>/// <param name="stream">文件流</param>/// <param name="type">Excel格式枚举类型，xls/xlsx</param>/// <param name="sheetName">表名，默认取第一张</param>/// <returns>DataTable</returns>private static DataTable ImportExcel(Stream stream, ExcelExtType type, string sheetName){DataTable dt = new DataTable();IWorkbook workbook;try{//xls使用HSSFWorkbook类实现，xlsx使用XSSFWorkbook类实现switch (type){case ExcelExtType.xlsx:workbook = new XSSFWorkbook(stream);break;default:workbook = new HSSFWorkbook(stream);break;}ISheet sheet = null;//获取工作表 默认取第一张if (string.IsNullOrWhiteSpace(sheetName))sheet = workbook.GetSheetAt(0);elsesheet = workbook.GetSheet(sheetName);if (sheet == null)return null;IEnumerator rows = sheet.GetRowEnumerator();#region 获取表头IRow headerRow = sheet.GetRow(0);int cellCount = headerRow.LastCellNum;for (int j = 0; j < cellCount; j++){ICell cell = headerRow.GetCell(j);if (cell != null){dt.Columns.Add(cell.ToString());}else{dt.Columns.Add("");}}#endregion#region 获取内容for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++){IRow row = sheet.GetRow(i);DataRow dataRow = dt.NewRow();for (int j = row.FirstCellNum; j < cellCount; j++){if (row.GetCell(j) != null){//判断单元格是否为日期格式if (row.GetCell(j).CellType == NPOI.SS.UserModel.CellType.Numeric && HSSFDateUtil.IsCellDateFormatted(row.GetCell(j))){if (row.GetCell(j).DateCellValue.Year >=1970){dataRow[j] = row.GetCell(j).DateCellValue.ToString();}else{dataRow[j] = row.GetCell(j).ToString();}}else{dataRow[j] = row.GetCell(j).ToString();}}}dt.Rows.Add(dataRow);}#endregion}catch (Exception ex){dt=null;}finally{//if (stream != null)//{//    stream.Close();//    stream.Dispose();//}}return dt;}

2. 文件上载导入

    /// <summary>/// 上传Excel导入/// </summary>/// <param name="file">上载文件对象</param>/// <param name="errorMsg">错误信息</param>/// <param name="sheetName">表名，默认取第一张</param>/// <returns></returns>public static DataTable Import(System.Web.HttpPostedFileBase file, ref string errorMsg, string sheetName = ""){if (file == null || file.InputStream == null || file.InputStream.Length == 0){errorMsg = "请选择要导入的Excel文件";return null;}var excelType = GetExcelFileType(file.FileName);if (excelType == null){errorMsg = "请选择正确的Excel文件";return null;}using (var stream = new MemoryStream()){file.InputStream.Position = 0;file.InputStream.CopyTo(stream);var dt = ImportExcel(stream, excelType.Value, sheetName);if (dt == null)errorMsg = "导入失败,请选择正确的Excel文件";return dt;}}

3. 本地路径读取导入

    /// <summary>/// 根据文件路径导入Excel/// </summary>/// <param name="filePath"></param>/// <param name="errorMsg">错误信息</param>/// <param name="sheetName">表名，默认取第一张</param>/// <returns>可能为null的DataTable</returns>public static DataTable Import(string filePath, ref string errorMsg, string sheetName = ""){var excelType = GetExcelFileType(filePath);if (GetExcelFileType(filePath) == null){errorMsg = "请选择正确的Excel文件";return null;}if (!File.Exists(filePath)){errorMsg = "没有找到要导入的Excel文件";return null;}DataTable dt;using (var stream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)){dt = ImportExcel(stream, excelType.Value, sheetName);}if (dt == null)errorMsg = "导入失败,请选择正确的Excel文件";return dt;}

4.完整demo

附赠一个winform导入Excel的Demo。
https://github.com/yimogit/NopiExcelDemo