使用NPOI将Excel导出到DataTable

我想读取使用NPOI的Excel表格2010 xlsx，然后将数据导出到DataTables，但不知道如何使用它。 任何人都可以告诉我一步一步如何将Excel导出到Datatable？ 我已经下载NPOI.dll，添加到参考，但不知道进一步…

Answer 1

这是关于您可以使用NPOI将Excel文件转换为DataSet的最小代码：

IWorkbook workbook; using (FileStream stream = new FileStream(excelFilePath, FileMode.Open, FileAccess.Read)) { workbook = new HSSFWorkbook(stream); } ISheet sheet = workbook.GetSheetAt(0); // zero-based index of your target sheet DataTable dt = new DataTable(sheet.SheetName); // write header row IRow headerRow = sheet.GetRow(0); foreach (ICell headerCell in headerRow) { dt.Columns.Add(headerCell.ToString()); } // write the rest int rowIndex = 0; foreach (IRow row in sheet) { // skip header row if (rowIndex++ == 0) continue; DataRow dataRow = dt.NewRow(); dataRow.ItemArray = row.Cells.Select(c => c.ToString()).ToArray(); dt.Rows.Add(dataRow); } 

Answer 2

 private static ISheet GetFileStream(string fullFilePath) { var fileExtension = Path.GetExtension(fullFilePath); string sheetName; ISheet sheet = null; switch (fileExtension) { case ".xlsx": using (var fs = new FileStream(fullFilePath, FileMode.Open, FileAccess.Read)) { var wb = new XSSFWorkbook(fs); sheetName = wb.GetSheetAt(0).SheetName; sheet = (XSSFSheet) wb.GetSheet(sheetName); } break; case ".xls": using (var fs = new FileStream(fullFilePath, FileMode.Open, FileAccess.Read)) { var wb = new HSSFWorkbook(fs); sheetName = wb.GetSheetAt(0).SheetName; sheet = (HSSFSheet) wb.GetSheet(sheetName); } break; } return sheet; } private static DataTable GetRequestsDataFromExcel(string fullFilePath) { try { var sh = GetFileStream(fullFilePath); var dtExcelTable = new DataTable(); dtExcelTable.Rows.Clear(); dtExcelTable.Columns.Clear(); var headerRow = sh.GetRow(0); int colCount = headerRow.LastCellNum; for (var c = 0; c < colCount; c++) dtExcelTable.Columns.Add(headerRow.GetCell(c).ToString()); var i = 1; var currentRow = sh.GetRow(i); while (currentRow != null) { var dr = dtExcelTable.NewRow(); for (var j = 0; j < currentRow.Cells.Count; j++) { var cell = currentRow.GetCell(j); if (cell != null) switch (cell.CellType) { case CellType.Numeric: dr[j] = DateUtil.IsCellDateFormatted(cell) ? cell.DateCellValue.ToString(CultureInfo.InvariantCulture) : cell.NumericCellValue.ToString(CultureInfo.InvariantCulture); break; case CellType.String: dr[j] = cell.StringCellValue; break; case CellType.Blank: dr[j] = string.Empty; break; } } dtExcelTable.Rows.Add(dr); i++; currentRow = sh.GetRow(i); } return dtExcelTable; } catch (Exception e) { throw; } } 

Answer 3

你可以通过NPOI试试这个简单的方法：

 private DataTable GetDataTableFromExcel(String Path) { XSSFWorkbook wb; XSSFSheet sh; String Sheet_name; using (var fs = new FileStream(Path, FileMode.Open, FileAccess.Read)) { wb = new XSSFWorkbook(fs); Sheet_name= wb.GetSheetAt(0).SheetName; //get first sheet name } DataTable DT = new DataTable(); DT.Rows.Clear(); DT.Columns.Clear(); // get sheet sh = (XSSFSheet)wb.GetSheet(Sheet_name); int i = 0; while (sh.GetRow(i) != null) { // add neccessary columns if (DT.Columns.Count < sh.GetRow(i).Cells.Count) { for (int j = 0; j < sh.GetRow(i).Cells.Count; j++) { DT.Columns.Add("", typeof(string)); } } // add row DT.Rows.Add(); // write row value for (int j = 0; j < sh.GetRow(i).Cells.Count; j++) { var cell = sh.GetRow(i).GetCell(j); if (cell != null) { // TODO: you can add more cell types capatibility, eg formula switch (cell.CellType) { case NPOI.SS.UserModel.CellType.Numeric: DT.Rows[i][j] = sh.GetRow(i).GetCell(j).NumericCellValue; //dataGridView1[j, i].Value = sh.GetRow(i).GetCell(j).NumericCellValue; break; case NPOI.SS.UserModel.CellType.String: DT.Rows[i][j] = sh.GetRow(i).GetCell(j).StringCellValue; break; } } } i++; } return DT; } 

Answer 4

在Codeplex网站的下载部分有一个example package – 一包C＃示例。 尝试一下，如果你还没有。

这是最简单的例子 –

 using NPOI.HSSF.UserModel; using NPOI.SS.UserModel; //..... private void button1_Click(object sender, EventArgs e) { HSSFWorkbook hssfwb; using (FileStream file = new FileStream(@"c:\test.xls", FileMode.Open, FileAccess.Read)) { hssfwb= new HSSFWorkbook(file); } ISheet sheet = hssfwb.GetSheet("Arkusz1"); for (int row = 0; row <= sheet.LastRowNum; row++) { if (sheet.GetRow(row) != null) //null is when the row only contains empty cells { MessageBox.Show(string.Format("Row {0} = {1}", row, sheet.GetRow(row).GetCell(0).StringCellValue)); } } } 

Answer 5

你可以在Toxy项目中尝试ToxySpreadsheet – toxy.codeplex.com。 ToxySpreadsheet.ToDataSet（）是你想要的。

Answer 6

你可以通过这个来完成你的任务。

 using NPOI.SS.UserModel; using NPOI.XSSF.UserModel; using NPOI.Util.Collections; using NPOI; using System.Collections.Generic; using NPOI.OpenXmlFormats.Spreadsheet; using NPOI.HSSF.UserModel; using NPOI.SS.Util; public DataTable xlsxToDT(Stream str) { XSSFWorkbook hssfworkbook = new XSSFWorkbook(str); ISheet sheet = hssfworkbook.GetSheetAt(0); str.Close(); DataTable dt = new DataTable(); IRow headerRow = sheet.GetRow(0); IEnumerator rows = sheet.GetRowEnumerator(); int colCount = headerRow.LastCellNum; int rowCount = sheet.LastRowNum; for (int c = 0; c < colCount; c++) dt.Columns.Add(headerRow.GetCell(c).ToString()); while (rows.MoveNext()) { IRow row = (XSSFRow)rows.Current; DataRow dr = dt.NewRow(); for (int i = 0; i < colCount; i++) { ICell cell = row.GetCell(i); if (cell != null) dr[i] = cell.ToString(); } dt.Rows.Add(dr); } return dt; 

}

Answer 7

NPOI是读取Excel文件的绝佳方法，现在在版本2中，您可以读取XLS和XLSX文件types。

1. 在他们的网站上获取最新版本的NPOI： https ：//npoi.codeplex.com/
2. 在您的项目中添加对以下文件的引用：NPOI.dll，NPOI.OOXML.dll和NPOI.OpenXml4Net.dll。
3. 添加以下Usings：使用NPOI.SS.UserModel; 使用NPOI.HSSF.UserModel; 使用NPOI.XSSF.UserModel;

现在下面的代码做的伎俩，评论是西class牙语，对不起： – p

 private DataTable Excel_To_DataTable(string pRutaArchivo, int pHojaIndex) { // --------------------------------- // /* REFERENCIAS: * NPOI.dll * NPOI.OOXML.dll * NPOI.OpenXml4Net.dll */ // --------------------------------- // /* USING: * using NPOI.SS.UserModel; * using NPOI.HSSF.UserModel; * using NPOI.XSSF.UserModel; */ // --------------------------------- // DataTable Tabla = null; try { if (System.IO.File.Exists(pRutaArchivo)) { IWorkbook workbook = null; //IWorkbook determina se es xls o xlsx ISheet worksheet = null; string first_sheet_name = ""; using (FileStream FS = new FileStream(pRutaArchivo, FileMode.Open, FileAccess.Read)) { workbook = WorkbookFactory.Create(FS); //Abre tanto XLS como XLSX worksheet = workbook.GetSheetAt(pHojaIndex); //Obtener Hoja por indice first_sheet_name = worksheet.SheetName; //Obtener el nombre de la Hoja Tabla = new DataTable(first_sheet_name); Tabla.Rows.Clear(); Tabla.Columns.Clear(); // Leer Fila por fila desde la primera for (int rowIndex = 0; rowIndex <= worksheet.LastRowNum; rowIndex++) { DataRow NewReg = null; IRow row = worksheet.GetRow(rowIndex); IRow row2 = null; if (row != null) //null is when the row only contains empty cells { if (rowIndex > 0) NewReg = Tabla.NewRow(); //Leer cada Columna de la fila foreach (ICell cell in row.Cells) { object valorCell = null; string cellType = ""; if (rowIndex == 0) //Asumo que la primera fila contiene los titlos: { row2 = worksheet.GetRow(rowIndex + 1); //Si es la rimera fila, obtengo tambien la segunda para saber los tipos: ICell cell2 = row2.GetCell(cell.ColumnIndex); switch (cell2.CellType) { case CellType.Boolean: cellType = "System.Boolean"; break; case CellType.String: cellType = "System.String"; break; case CellType.Numeric: if (HSSFDateUtil.IsCellDateFormatted(cell2)) { cellType = "System.DateTime"; } else { cellType = "System.Double"; } break; case CellType.Formula: switch (cell2.CachedFormulaResultType) { case CellType.Boolean: cellType = "System.Boolean"; break; case CellType.String: cellType = "System.String"; break; case CellType.Numeric: if (HSSFDateUtil.IsCellDateFormatted(cell2)) { cellType = "System.DateTime"; } else { cellType = "System.Double"; } break; } break; default: cellType = "System.String"; break; } //Agregar los campos de la tabla: DataColumn codigo = new DataColumn(cell.StringCellValue, System.Type.GetType(cellType)); Tabla.Columns.Add(codigo); } else { //Las demas filas son registros: switch (cell.CellType) { case CellType.Blank: valorCell = DBNull.Value; break; case CellType.Boolean: valorCell = cell.BooleanCellValue; break; case CellType.String: valorCell = cell.StringCellValue; break; case CellType.Numeric: if (HSSFDateUtil.IsCellDateFormatted(cell)) { valorCell = cell.DateCellValue; } else { valorCell = cell.NumericCellValue; } break; case CellType.Formula: switch (cell.CachedFormulaResultType) { case CellType.Blank: valorCell = DBNull.Value; break; case CellType.String: valorCell = cell.StringCellValue; break; case CellType.Boolean: valorCell = cell.BooleanCellValue; break; case CellType.Numeric: if (HSSFDateUtil.IsCellDateFormatted(cell)) { valorCell = cell.DateCellValue; } else { valorCell = cell.NumericCellValue; } break; } break; default: valorCell = cell.StringCellValue; break; } NewReg[cell.ColumnIndex] = valorCell; } } } if (rowIndex > 0) Tabla.Rows.Add(NewReg); } Tabla.AcceptChanges(); } } else { throw new Exception("ERROR 404: El archivo especificado NO existe."); } } catch (Exception ex) { throw ex; } return Tabla; } 

上面的代码假定工作表的第一行有列名。 该代码还确定每个单元格的数据types，并尝试将其转换为ADO数据types。 空白单元格被转换为空。

希望这可以帮助你和其他人在相同的情况。