依赖包：
代码如下
using System; using System.Collections; using System.Data; using System.Globalization; using System.IO; using System.Text; using NPOI.HPSF; using NPOI.HSSF.UserModel; using NPOI.SS.Formula.Eval; using NPOI.SS.UserModel; using NPOI.SS.Util; namespace NPIOTest.Controllers { /// <summary> /// 类说明：Excel操作静态类（基于NPOI组件） /// 编码人： /// 联系方式： /// </summary> public static class ExcelHelper { /// <summary> /// 获取Excel文件sheet页总数 /// </summary> /// <param name="outputFile">要读取Excel文件</param> /// <returns></returns> public static int GetSheetNumber(string outputFile) { var number = 0; try { var readFile = new FileStream(outputFile, FileMode.Open, FileAccess.Read); var workbook = new HSSFWorkbook(readFile); number = workbook.NumberOfSheets; } catch (Exception) { //这里添加异常异常日志记录 return 0; } return number; } /// <summary> /// 获取Excel文件sheet名称集合 /// </summary> /// <param name="outputFile">要读取Excel文件</param> /// <returns></returns> public static ArrayList GetSheetName(string outputFile) { var arrayList = new ArrayList(); try { var readFile = new FileStream(outputFile, FileMode.Open, FileAccess.Read); var workbook = new HSSFWorkbook(readFile); for (var i = 0; i < workbook.NumberOfSheets; i++) { arrayList.Add(workbook.GetSheetName(i)); } } catch (Exception) { //这里添加异常异常日志记录 return null; } return arrayList; } /// <summary> /// 从DataTable中将数据导出到Excel文件 /// </summary> /// <param name="dtSource">提供导出数据的DataTable</param> /// <param name="headerText">表头文本</param> /// <returns></returns> public static MemoryStream ExportDataTable(DataTable dtSource, string headerText) { //创建工作表 var workbook = new HSSFWorkbook(); //创建sheet页 var sheet = workbook.CreateSheet(); #region 添加Excel文件属性信息 var dsi = PropertySetFactory.CreateDocumentSummaryInformation(); dsi.Company = ""; workbook.DocumentSummaryInformation = dsi; var si = PropertySetFactory.CreateSummaryInformation(); si.Author = ""; si.ApplicationName = "使用NPOI创建的Excel文件"; si.CreateDateTime = DateTime.Now; workbook.SummaryInformation = si; #endregion //设置日期格式 var dateStyle = workbook.CreateCellStyle(); var format = workbook.CreateDataFormat(); dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd"); //取得列宽 var columnWidth = new int[dtSource.Columns.Count]; //遍历DataTable的列 foreach (DataColumn column in dtSource.Columns) { columnWidth[column.Ordinal] = Encoding.GetEncoding(936).GetBytes(column.ColumnName).Length; } //遍历所有的Row,若当前Row内容长度超出列名长度，则将此列的长度设为该Row内容长度 for (var i = 0; i < dtSource.Rows.Count; i++) { for (var j = 0; j < dtSource.Columns.Count; j++) { var currentRowLength = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length; if (currentRowLength > columnWidth[j]) columnWidth[j] = currentRowLength; } } var rowIndex = 0; #region 表头及样式 var headRow = sheet.CreateRow(0); headRow.HeightInPoints = 25; headRow.CreateCell(0).SetCellValue(headerText); var headStyle = workbook.CreateCellStyle(); headStyle.Alignment = HorizontalAlignment.Center; var font = workbook.CreateFont(); font.Boldweight = 700; font.FontHeightInPoints = 20; headStyle.SetFont(font); headRow.GetCell(0).CellStyle = headStyle; sheet.AddMergedRegion(new CellRangeAddress(0, 0, 0, dtSource.Columns.Count - 1)); #endregion #region 列头及样式 var columnRow = sheet.CreateRow(1); var columnStyle = workbook.CreateCellStyle(); columnStyle.Alignment = HorizontalAlignment.Center; var columnFont = workbook.CreateFont(); columnFont.Boldweight = 700; columnFont.FontHeightInPoints = 10; columnStyle.SetFont(columnFont); foreach (DataColumn column in dtSource.Columns) { //设置列头内容 columnRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName); //设置列头样式 columnRow.GetCell(column.Ordinal).CellStyle = columnStyle; //设置列宽 sheet.SetColumnWidth(column.Ordinal, (columnWidth[column.Ordinal] + 1) * 256); } #endregion rowIndex = 2; foreach (DataRow row in dtSource.Rows) { if (rowIndex == 65535) sheet = workbook.CreateSheet(); #region 填充数据 var dataRow = sheet.CreateRow(rowIndex); foreach (DataColumn column in dtSource.Columns) { var newCell = dataRow.CreateCell(column.Ordinal); var cellValue = row[column].ToString(); switch (column.DataType.ToString()) { //字符串类型 case "System.String": double result; if (double.TryParse(cellValue, out result)) { newCell.SetCellValue(result); break; } newCell.SetCellValue(cellValue); break; //DateTime类型 case "System.DateTime": DateTime tmpdt; if (DateTime.TryParse(cellValue, out tmpdt)) { newCell.SetCellValue(tmpdt); newCell.CellStyle = dateStyle; break; } newCell.SetCellValue(cellValue); break; //布尔类型 case "System.Boolean": bool boolV; if (bool.TryParse(cellValue, out boolV)) { newCell.SetCellValue(boolV); break; } newCell.SetCellValue(cellValue); break; //整型 case "System.Int16": case "System.Int32": case "System.Int64": case "System.Byte": int intV; if (int.TryParse(cellValue, out intV)) { newCell.SetCellValue(intV); break; } newCell.SetCellValue(cellValue); break; //浮点型 case "System.Decimal": case "System.Double": double doubV; if (double.TryParse(cellValue, out doubV)) { newCell.SetCellValue(doubV); break; } newCell.SetCellValue(cellValue); break; //空值处理 case "System.DBNull": newCell.SetCellValue(""); break; default: newCell.SetCellValue(""); break; } } rowIndex++; #endregion } using (var ms = new MemoryStream()) { workbook.Write(ms); ms.Flush(); ms.Position = 0; return ms; } } /// <summary> /// DataTable导出到Excel文件 /// </summary> /// <param name="dtSource">源DataTable</param> /// <param name="headerText">表头</param> /// <param name="fileName">Excel文件保存位置(包含文件名)</param> public static void ExportDataTableToExcel(DataTable dtSource, string headerText, string fileName) { using (var ms = ExportDataTable(dtSource, headerText)) { using (var fileStream = new FileStream(fileName, FileMode.Create, FileAccess.Write)) { var data = ms.ToArray(); fileStream.Write(data, 0, data.Length); fileStream.Flush(); } } } /// <summary> /// 将sheet页导出至DataTable中 /// </summary> /// <param name="sheet">需要导出的sheet</param> /// <param name="headerRowIndex">表头所在行号,-1表示没有列头</param> /// <returns>返回的DataTable</returns> public static DataTable ImportSheetToDataTable(HSSFSheet sheet, int headerRowIndex) { var dataTable = new DataTable(); try { HSSFRow headerRow; int cellCount; if (headerRowIndex < 0) { headerRow = (HSSFRow)sheet.GetRow(0); cellCount = headerRow.LastCellNum; for (int i = headerRow.FirstCellNum; i <= cellCount; i++) { var column = new DataColumn(i.ToString(CultureInfo.InvariantCulture)); dataTable.Columns.Add(column); } } else { headerRow = (HSSFRow)sheet.GetRow(headerRowIndex + 1); cellCount = headerRow.LastCellNum; for (int i = headerRow.FirstCellNum; i < cellCount; i++) { if (headerRow.GetCell(i) == null) { if (dataTable.Columns.IndexOf(i.ToString(CultureInfo.InvariantCulture)) > 0) { var column = new DataColumn("重复列名" + i); dataTable.Columns.Add(column); } else { var column = new DataColumn(Convert.ToString(i)); dataTable.Columns.Add(column); } } else if (dataTable.Columns.IndexOf(headerRow.GetCell(i).ToString()) > 0) { var column = new DataColumn("重复列名" + i); dataTable.Columns.Add(column); } else { var column = new DataColumn(headerRow.GetCell(i).ToString()); dataTable.Columns.Add(column); } } } for (var i = (headerRowIndex + 2); i <= sheet.LastRowNum; i++) { try { HSSFRow row; if (sheet.GetRow(i) == null) { row = sheet.CreateRow(i) as HSSFRow; } else { row = sheet.GetRow(i) as HSSFRow; } var dataRow = dataTable.NewRow(); if (row != null) for (int j = row.FirstCellNum; j <= cellCount; j++) { try { if (row.GetCell(j) == null) continue; switch (row.GetCell(j).CellType) { case CellType.String: var str = row.GetCell(j).StringCellValue; if (!string.IsNullOrEmpty(str)) { dataRow[j] = str; } else { dataRow[j] = null; } break; case CellType.Numeric: if (DateUtil.IsCellDateFormatted(row.GetCell(j))) { dataRow[j] = DateTime.FromOADate(row.GetCell(j).NumericCellValue); } else { dataRow[j] = Convert.ToDouble(row.GetCell(j).NumericCellValue); } break; case CellType.Boolean: dataRow[j] = Convert.ToString(row.GetCell(j).BooleanCellValue); break; case CellType.Error: dataRow[j] = ErrorEval.GetText(row.GetCell(j).ErrorCellValue); break; case CellType.Formula: switch (row.GetCell(j).CachedFormulaResultType) { case CellType.String: var strFormula = row.GetCell(j).StringCellValue; if (!string.IsNullOrEmpty(strFormula)) { dataRow[j] = strFormula; } else { dataRow[j] = null; } break; case CellType.Numeric: dataRow[j] = Convert.ToString(row.GetCell(j).NumericCellValue); break; case CellType.Boolean: dataRow[j] = Convert.ToString(row.GetCell(j).BooleanCellValue); break; case CellType.Error: dataRow[j] = ErrorEval.GetText(row.GetCell(j).ErrorCellValue); break; default: dataRow[j] = ""; break; } break; default: dataRow[j] = ""; break; } } catch (Exception) { //这里添加异常异常日志记录 return null; } } dataTable.Rows.Add(dataRow); } catch (Exception) { //这里添加异常异常日志记录 return null; } } } catch (Exception) { //这里添加异常异常日志记录 return null; } return dataTable; } /// <summary> /// 将Excel指定sheet数据导出至DataTable中 /// </summary> /// <param name="fileName"></param> /// <param name="sheetIndex"></param> /// <param name="headerRowIndex"></param> /// <returns>返回的DataTable</returns> public static DataTable ImportExcelToDataTable(string fileName, int sheetIndex, int headerRowIndex) { HSSFWorkbook workbook; using (var fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read)) { workbook = new HSSFWorkbook(fileStream); } HSSFSheet sheet = (HSSFSheet)workbook.GetSheetAt(sheetIndex); var dataTable = ImportSheetToDataTable(sheet, headerRowIndex); workbook = null; sheet = null; return dataTable; } #region 更新excel中的数据 /// <summary> /// 更新Excel表格 /// </summary> /// <param name="outputFile">需更新的excel表格路径</param> /// <param name="sheetname">sheet名</param> /// <param name="updateData">需更新的数据</param> /// <param name="coluid">需更新的列号</param> /// <param name="rowid">需更新的开始行号</param> public static void UpdateExcel(string outputFile, string sheetname, string[] updateData, int coluid, int rowid) { FileStream readfile = new FileStream(outputFile, FileMode.Open, FileAccess.Read); HSSFWorkbook hssfworkbook = new HSSFWorkbook(readfile); ISheet sheet1 = hssfworkbook.GetSheet(sheetname); for (int i = 0; i < updateData.Length; i++) { try { if (sheet1.GetRow(i + rowid) == null) { sheet1.CreateRow(i + rowid); } if (sheet1.GetRow(i + rowid).GetCell(coluid) == null) { sheet1.GetRow(i + rowid).CreateCell(coluid); } sheet1.GetRow(i + rowid).GetCell(coluid).SetCellValue(updateData[i]); } catch (Exception ex) { // 这里添加异常异常日志记录 throw; } } try { readfile.Close(); FileStream writefile = new FileStream(outputFile, FileMode.Create, FileAccess.Write); hssfworkbook.Write(writefile); writefile.Close(); } catch (Exception ex) { // 这里添加异常异常日志记录 } } /// <summary> /// 更新Excel表格 /// </summary> /// <param name="outputFile">需更新的excel表格路径</param> /// <param name="sheetname">sheet名</param> /// <param name="updateData">需更新的数据</param> /// <param name="coluids">需更新的列号</param> /// <param name="rowid">需更新的开始行号</param> public static void UpdateExcel(string outputFile, string sheetname, string[][] updateData, int[] coluids, int rowid) { var readfile = new FileStream(outputFile, FileMode.Open, FileAccess.Read); var hssfworkbook = new HSSFWorkbook(readfile); readfile.Close(); var sheet1 = hssfworkbook.GetSheet(sheetname); for (var j = 0; j < coluids.Length; j++) { for (var i = 0; i < updateData[j].Length; i++) { try { if (sheet1.GetRow(i + rowid) == null) { sheet1.CreateRow(i + rowid); } if (sheet1.GetRow(i + rowid).GetCell(coluids[j]) == null) { sheet1.GetRow(i + rowid).CreateCell(coluids[j]); } sheet1.GetRow(i + rowid).GetCell(coluids[j]).SetCellValue(updateData[j][i]); } catch (Exception ex) { // 这里添加异常异常日志记录 } } } try { var writefile = new FileStream(outputFile, FileMode.Create); hssfworkbook.Write(writefile); writefile.Close(); } catch (Exception ex) { //这里添加异常异常日志记录 } } /// <summary> /// 更新Excel表格 /// </summary> /// <param name="outputFile">需更新的excel表格路径</param> /// <param name="sheetname">sheet名</param> /// <param name="updateData">需更新的数据</param> /// <param name="coluid">需更新的列号</param> /// <param name="rowid">需更新的开始行号</param> public static void UpdateExcel(string outputFile, string sheetname, double[] updateData, int coluid, int rowid) { var readfile = new FileStream(outputFile, FileMode.Open, FileAccess.Read); var hssfworkbook = new HSSFWorkbook(readfile); var sheet1 = hssfworkbook.GetSheet(sheetname); for (var i = 0; i < updateData.Length; i++) { try { if (sheet1.GetRow(i + rowid) == null) { sheet1.CreateRow(i + rowid); } if (sheet1.GetRow(i + rowid).GetCell(coluid) == null) { sheet1.GetRow(i + rowid).CreateCell(coluid); } sheet1.GetRow(i + rowid).GetCell(coluid).SetCellValue(updateData[i]); } catch (Exception ex) { //这里添加异常异常日志记录 throw; } } try { readfile.Close(); var writefile = new FileStream(outputFile, FileMode.Create, FileAccess.Write); hssfworkbook.Write(writefile); writefile.Close(); } catch (Exception ex) { //这里添加异常异常日志记录 } } /// <summary> /// 更新Excel表格 /// </summary> /// <param name="outputFile">需更新的excel表格路径</param> /// <param name="sheetname">sheet名</param> /// <param name="updateData">需更新的数据</param> /// <param name="coluids">需更新的列号</param> /// <param name="rowid">需更新的开始行号</param> public static void UpdateExcel(string outputFile, string sheetname, double[][] updateData, int[] coluids, int rowid) { var readfile = new FileStream(outputFile, FileMode.Open, FileAccess.Read); var hssfworkbook = new HSSFWorkbook(readfile); readfile.Close(); var sheet1 = hssfworkbook.GetSheet(sheetname); for (var j = 0; j < coluids.Length; j++) { for (var i = 0; i < updateData[j].Length; i++) { try { if (sheet1.GetRow(i + rowid) == null) { sheet1.CreateRow(i + rowid); } if (sheet1.GetRow(i + rowid).GetCell(coluids[j]) == null) { sheet1.GetRow(i + rowid).CreateCell(coluids[j]); } sheet1.GetRow(i + rowid).GetCell(coluids[j]).SetCellValue(updateData[j][i]); } catch (Exception ex) { //这里添加异常异常日志记录 } } } try { var writefile = new FileStream(outputFile, FileMode.Create); hssfworkbook.Write(writefile); writefile.Close(); } catch (Exception) { //这里添加异常异常日志记录 } } #endregion } }