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NPOI读取、写入Excel 简介使用 NPOI 你就可以在没有安装 Office 或者相应环境的机器上对 WORD/EXCEL 文档进行读写。NPOI是构建在POI 3.x版本之上的，它可以在没有安装Office的情况下对Word/Excel文档进行读写操作。代码封装using NPOI.HSSF.UserModel; using NPOI.SS.UserModel; using NPOI.XSSF.UserModel; using System; using System.Collections.Generic; using System.Data; using System.IO; using System.Linq; using System.Text; namespace Genersoft.GS.ZDB.Development.Controller.RO { public class NPOIHelper : IDisposable { private string fileName = null; //文件名 private IWorkbook workbook = null; private FileStream fs = null; private bool disposed; public NPOIHelper(string fileName) { this.fileName = fileName; disposed = false; } #region 导出Excel 根据datatable的格式导出对应的格式 /// <summary> /// 导出Excel 根据datatable的格式导出对应的格式 /// </summary> /// <param name="fileName">保存路径</param> /// <param name="dtSource">导出的数据源</param> /// <param name="sheetName">创建的sheet表名称</param> /// <param name="isColumnWritten">是否写入列名作为Excel头</param> /// <returns></returns> public int DataTableToExcel( DataTable dtSource, string sheetName, bool isColumnWritten) { FileStream fs = null; int i = 0; int j = 0; int count = 0; IWorkbook workbook = null; ISheet sheet = null; try { using (fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.ReadWrite)) { if (fileName.IndexOf(".xlsx") > 0) // 2007版本 workbook = new XSSFWorkbook(); else if (fileName.IndexOf(".xls") > 0) // 2003版本 workbook = new HSSFWorkbook(); if (workbook != null) { sheet = workbook.CreateSheet(sheetName); } else { return -1; } ICellStyle dateStyle = workbook.CreateCellStyle(); IDataFormat format = workbook.CreateDataFormat(); dateStyle.DataFormat = format.GetFormat("yyyy/mm/dd"); ICellStyle dateStyleStr = workbook.CreateCellStyle(); IDataFormat formatStr = workbook.CreateDataFormat(); dateStyleStr.DataFormat = formatStr.GetFormat("@"); if (isColumnWritten == true) //写入DataTable的列名 { IRow row = sheet.CreateRow(0); for (j = 0; j < dtSource.Columns.Count; ++j) { row.CreateCell(j).SetCellValue(dtSource.Columns[j].ColumnName); } count = 1; } else { count = 0; } foreach (DataRow dr in dtSource.Rows) { IRow row = sheet.CreateRow(count); foreach (DataColumn column in dtSource.Columns) { ICell newCell = row.CreateCell(column.Ordinal); string drValue = dr[column].ToString(); switch (column.DataType.ToString()) { case "System.String"://字符串类型 newCell.SetCellValue(drValue); newCell.SetCellType(CellType.String); newCell.CellStyle = dateStyleStr; break; case "System.DateTime"://日期类型 DateTime dateV; if (!string.IsNullOrEmpty(drValue)) { DateTime.TryParse(drValue, out dateV); newCell.SetCellValue(dateV); } newCell.CellStyle = dateStyle;//格式化显示 break; case "System.Boolean"://布尔型 bool boolV = false; bool.TryParse(drValue, out boolV); newCell.SetCellValue(boolV); newCell.SetCellType(CellType.Boolean); break; case "System.Int16"://整型 case "System.Int32": case "System.Int64": case "System.Byte": if (!string.IsNullOrEmpty(drValue)) { int intV = 0; int.TryParse(drValue, out intV); newCell.SetCellValue(intV); newCell.SetCellType(CellType.Numeric); } break; case "System.Decimal"://浮点型 case "System.Double": if (!string.IsNullOrEmpty(drValue)) { double doubV = 0; double.TryParse(drValue, out doubV); newCell.SetCellValue(doubV); newCell.SetCellType(CellType.Numeric); } break; case "System.DBNull"://空值处理 newCell.SetCellValue(""); break; default: newCell.SetCellValue(""); break; } } ++count; } for ( i = 0; i <= sheet.LastRowNum; i++) { sheet.AutoSizeColumn(i,true); } sheet.SetColumnWidth(4, 10 * 256); sheet.SetColumnWidth(5, 10 * 256); if (dtSource.Columns.Count >= 13) { sheet.SetColumnWidth(13, 10 * 256); } workbook.Write(fs); //写入到excel} return count; } } catch (Exception ex) { fs.Dispose(); fs.Close(); throw; } } #endregion #region 导出Excel 根据datatable的格式导出对应的格式 /// <summary> /// 导出Excel 根据datatable的格式导出对应的格式 /// </summary> /// <param name="fileName">保存路径</param> /// <param name="dtSource">导出的数据源</param> /// <param name="sheetName">创建的sheet表名称</param> /// <param name="isColumnWritten">是否写入列名作为Excel头</param> /// <returns></returns> public int DataTableToExcelString(DataTable dtSource, string sheetName, bool isColumnWritten) { FileStream fs = null; int i = 0; int j = 0; int count = 0; IWorkbook workbook = null; ISheet sheet = null; try { using (fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.ReadWrite)) { if (fileName.IndexOf(".xlsx") > 0) // 2007版本 workbook = new XSSFWorkbook(); else if (fileName.IndexOf(".xls") > 0) // 2003版本 workbook = new HSSFWorkbook(); if (workbook != null) { sheet = workbook.CreateSheet(sheetName); } else { return -1; } ICellStyle dateStyle = workbook.CreateCellStyle(); IDataFormat format = workbook.CreateDataFormat(); dateStyle.DataFormat = format.GetFormat("yyyy/mm/dd hh:mm:ss"); ICellStyle dateStyleStr = workbook.CreateCellStyle(); IDataFormat formatStr = workbook.CreateDataFormat(); dateStyleStr.DataFormat = formatStr.GetFormat("@"); if (isColumnWritten == true) //写入DataTable的列名 { IRow row = sheet.CreateRow(0); for (j = 0; j < dtSource.Columns.Count; ++j) { row.CreateCell(j).SetCellValue(dtSource.Columns[j].ColumnName); } count = 1; } else { count = 0; } foreach (DataRow dr in dtSource.Rows) { IRow row = sheet.CreateRow(count); foreach (DataColumn column in dtSource.Columns) { ICell newCell = row.CreateCell(column.Ordinal); string drValue = dr[column].ToString(); switch (column.DataType.ToString()) { case "System.String"://字符串类型 newCell.SetCellValue(drValue); newCell.CellStyle = dateStyleStr; break; case "System.DateTime"://日期类型 DateTime dateV; if (!string.IsNullOrEmpty(drValue)) { DateTime.TryParse(drValue, out dateV); newCell.SetCellValue(dateV); } newCell.CellStyle = dateStyle;//格式化显示 break; case "System.Boolean"://布尔型 bool boolV = false; bool.TryParse(drValue, out boolV); newCell.SetCellValue(boolV); break; case "System.Int16"://整型 case "System.Int32": case "System.Int64": case "System.Byte": if (!string.IsNullOrEmpty(drValue)) { int intV = 0; int.TryParse(drValue, out intV); newCell.SetCellValue(intV); newCell.SetCellType(CellType.Numeric); } break; case "System.Decimal"://浮点型 case "System.Double": if (!string.IsNullOrEmpty(drValue)) { double doubV = 0; double.TryParse(drValue, out doubV); newCell.SetCellValue(doubV); newCell.SetCellType(CellType.Numeric); } break; case "System.DBNull"://空值处理 newCell.SetCellValue(""); break; default: newCell.SetCellValue(""); break; } } ++count; } for (i = 0; i < sheet.LastRowNum; i++) { sheet.AutoSizeColumn(i, true); } workbook.Write(fs); //写入到excel} return count; } } catch (Exception ex) { fs.Dispose(); fs.Close(); throw; } } #endregion #region 将excel中的数据导入到DataTable中 /// <summary> /// 将excel中的数据导入到DataTable中 /// </summary> /// <param name="sheetName">excel工作薄sheet的名称</param> /// <param name="isFirstRowColumn">第一行是否是DataTable的列名</param> /// <returns>返回的DataTable</returns> public DataTable ExcelToDataTable(string sheetName, bool isFirstRowColumn) { ISheet sheet = null; DataTable data = new DataTable(); int startRow = 0; try { fs = new FileStream(fileName, FileMode.Open, FileAccess.Read); if (fileName.IndexOf(".xlsx") > 0) // 2007版本 workbook = new XSSFWorkbook(fs); else if (fileName.IndexOf(".xls") > 0) // 2003版本 workbook = new HSSFWorkbook(fs); if (sheetName != null) { sheet = workbook.GetSheet(sheetName); if (sheet == null) //如果没有找到指定的sheetName对应的sheet，则尝试获取第一个sheet { sheet = workbook.GetSheetAt(0); } } else { sheet = workbook.GetSheetAt(0); } if (sheet != null) { IRow firstRow = sheet.GetRow(0); int cellCount = firstRow.LastCellNum; //一行最后一个cell的编号 即总的列数 if (isFirstRowColumn) { for (int i = firstRow.FirstCellNum; i < cellCount; ++i) { ICell cell = firstRow.GetCell(i); if (cell != null) { string cellValue = cell.StringCellValue; if (cellValue != null) { DataColumn column = new DataColumn(cellValue); data.Columns.Add(column); } } } startRow = sheet.FirstRowNum + 1; } else { startRow = sheet.FirstRowNum; } //最后一列的标号 int rowCount = sheet.LastRowNum; for (int i = startRow; i <= rowCount; ++i) { IRow row = sheet.GetRow(i); if (row == null) continue; //没有数据的行默认是null DataRow dataRow = data.NewRow(); for (int j = row.FirstCellNum; j < cellCount; ++j) { if (row.GetCell(j) != null) //同理，没有数据的单元格都默认是null dataRow[j] = row.GetCell(j).ToString(); } data.Rows.Add(dataRow); } } return data; } catch (Exception ex) { Console.WriteLine("Exception: " + ex.Message); throw; } } #endregion public void Dispose() { Dispose(true); GC.SuppressFinalize(this); } protected virtual void Dispose(bool disposing) { if (!this.disposed) { if (disposing) { if (fs != null) fs.Close(); } fs = null; disposed = true; } } } }
