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 Common.Excel { public class ExcelHelper { /// <summary> /// Excel转换成DataTable /// </summary> /// <param name="excelFilePath">excel文件路径</param> /// <param name="sheetNum">sheet序号</param> /// <param name="headerRowNum">标题列序号</param> /// <returns></returns> public static DataTable ExcelToDataTable(string excelFilePath, int sheetNum = 0, int headerRowNum = 0) { IWorkbook workbook; DataTable dt; string extension = Path.GetExtension(excelFilePath).ToLower(); try { using (FileStream fileStream = new FileStream(excelFilePath, FileMode.Open, FileAccess.Read)) { if (extension == ".xlsx") { workbook = new XSSFWorkbook(fileStream); } else { workbook = new HSSFWorkbook(fileStream); } ISheet sheet = workbook.GetSheetAt(sheetNum); dt = new DataTable(sheet.SheetName); IRow headerRow = sheet.GetRow(headerRowNum); string fieldName = ""; for (int i = headerRow.FirstCellNum; i < headerRow.LastCellNum; i++) { if (headerRow.GetCell(i) != null) { fieldName = headerRow.GetCell(i).ToString().Trim(); DataColumn column = new DataColumn(fieldName); dt.Columns.Add(column); } else { break; } } DataRow dr; IRow row; ICell cell; //short format; for (int i = headerRowNum + 1; i <= sheet.LastRowNum; i++) { row = sheet.GetRow(i); if (row != null) { dr = dt.NewRow(); for (int j = headerRow.FirstCellNum; j < headerRow.LastCellNum; j++) { cell = row.GetCell(j); if (cell != null) { dr[j] = cell.ToString().Trim() == "" ? null : cell.ToString().Trim(); } else { dr[j] = null; } } dt.Rows.Add(dr); } } } } catch (Exception ex) { throw ex; } return dt; } /// <summary> /// Excel转换成DataTable /// </summary> /// <param name="excelFilePath">excel文件路径</param> /// <param name="sheetNum">sheet序号</param> /// <param name="headerRowNum">标题列序号</param> /// <returns></returns> public static DataTable ExcelStreamToDataTable(Stream Stream, string FileName, int sheetNum = 0, int headerRowNum = 0) { IWorkbook workbook; DataTable dt; try { using (Stream stream = Stream) { if (FileName.Contains(".xlsx")) { workbook = new XSSFWorkbook(stream); } else { workbook = new HSSFWorkbook(stream); } ISheet sheet = workbook.GetSheetAt(sheetNum); dt = new DataTable(sheet.SheetName); IRow headerRow = sheet.GetRow(headerRowNum); string fieldName = ""; for (int i = headerRow.FirstCellNum; i < headerRow.LastCellNum; i++) { if (headerRow.GetCell(i) != null) { fieldName = headerRow.GetCell(i).ToString().Trim(); DataColumn column = new DataColumn(fieldName); dt.Columns.Add(column); } else { break; } } DataRow dr; IRow row; ICell cell; //short format; for (int i = headerRowNum + 1; i <= sheet.LastRowNum; i++) { row = sheet.GetRow(i); if (row != null) { dr = dt.NewRow(); for (int j = headerRow.FirstCellNum; j < headerRow.LastCellNum; j++) { cell = row.GetCell(j); if (cell != null) { dr[j] = cell.ToString().Trim() == "" ? null : cell; } else { dr[j] = null; } } dt.Rows.Add(dr); } } } } catch (Exception ex) { throw ex; } return dt; } /// <summary> /// Excel转换成DataTable /// </summary> /// <param name="excelFilePath">excel文件路径</param> /// <param name="sheetName">sheet名称</param> /// <param name="headerRowNum">标题列序号</param> /// <returns></returns> public static DataTable ExcelToDataTable(string excelFilePath, string sheetName, int headerRowNum = 0) { IWorkbook workbook; DataTable dt; string extension = Path.GetExtension(excelFilePath).ToLower(); try { using (FileStream fileStream = new FileStream(excelFilePath, FileMode.Open, FileAccess.Read)) { if (extension == ".xlsx") { workbook = new XSSFWorkbook(fileStream); } else { workbook = new HSSFWorkbook(fileStream); } ISheet sheet; //如果有指定工作表名称 if (!string.IsNullOrEmpty(sheetName)) { sheet = workbook.GetSheet(sheetName); //如果没有找到指定的sheetName对应的sheet，则尝试获取第一个sheet if (sheet == null) { sheet = workbook.GetSheetAt(0); } } else { //如果没有指定的sheetName，则尝试获取第一个sheet sheet = workbook.GetSheetAt(0); } dt = new DataTable(sheet.SheetName); IRow headerRow = sheet.GetRow(headerRowNum); string fieldName = ""; //ArrayList fieldArray = new ArrayList(); /* 增加标题列 */ for (int i = headerRow.FirstCellNum; i < headerRow.LastCellNum; i++) { if (headerRow.GetCell(i) != null) { fieldName = headerRow.GetCell(i).ToString().Trim(); DataColumn column = new DataColumn(fieldName); dt.Columns.Add(column); } else { break; } } DataRow dr; IRow row; ICell cell; //short format; for (int i = headerRowNum + 1; i <= sheet.LastRowNum; i++) { row = sheet.GetRow(i); if (row != null) { dr = dt.NewRow(); for (int j = headerRow.FirstCellNum; j < headerRow.LastCellNum; j++) { cell = row.GetCell(j); if (cell != null) { dr[j] = cell.ToString().Trim() == "" ? null : cell.ToString().Trim(); } else { dr[j] = null; } } dt.Rows.Add(dr); } } } } catch (Exception ex) { throw ex; } return RemoveEmpty(dt); } /// <summary> /// 获取Excel里Sheet总数 /// </summary> /// <param name="excelFilePath"></param> /// <returns></returns> public static int GetExcelSheetTotal(string excelFilePath) { IWorkbook workbook; DataTable dt; string extension = Path.GetExtension(excelFilePath).ToLower(); try { using (FileStream fileStream = new FileStream(excelFilePath, FileMode.Open, FileAccess.Read)) { if (extension == ".xlsx") { workbook = new XSSFWorkbook(fileStream); } else { workbook = new HSSFWorkbook(fileStream); } return workbook.NumberOfSheets; } } catch (Exception ex) { throw ex; } } /// <summary> /// 将datatable导入到exel /// </summary> /// <param name="datatemp"></param> /// <param name="fileName"></param> ///<param name="removeEmpty">是否去除所有值都为空的列</param> /// <returns></returns> public static int DataTableToExcel(DataTable datatemp, string fileName, bool removeEmpty = true) { DataTable data = removeEmpty ? RemoveEmpty(datatemp) : datatemp; bool isColumnWritten = true; int i = 0; int j = 0; int count = 0; ISheet sheet = null; IWorkbook workbook = null; using (FileStream 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(); ICellStyle cellStyle = workbook.CreateCellStyle(); cellStyle.Alignment = HorizontalAlignment.CenterSelection; try { if (workbook != null) { sheet = workbook.CreateSheet("Sheet1"); } else { return -1; } if (isColumnWritten == true) //写入DataTable的列名 { IRow row = sheet.CreateRow(0); IFont font = workbook.CreateFont(); font.FontName = "宋体"; for (j = 0; j < data.Columns.Count; ++j) { row.CreateCell(j).SetCellValue(data.Columns[j].ColumnName); //设置自动列宽 sheet.AutoSizeColumn(j); //设置表头黑体 font.IsBold = true; cellStyle.SetFont(font); //单元格样式 row.GetCell(j).CellStyle = cellStyle; } count = 1; } else { count = 0; } for (i = 0; i < data.Rows.Count; ++i) { IRow row = sheet.CreateRow(count); for (j = 0; j < data.Columns.Count; ++j) { row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString()); sheet.AutoSizeColumn(j); } ++count; } workbook.Write(fs); //写入到excel return count; } catch (Exception ex) { Console.WriteLine("Exception: " + ex.Message); return -1; } } } /// <summary> /// Excel导出成内存流 /// </summary> /// <param name="data"></param> /// <returns></returns> public static MemoryStream DataTableToExcel(DataTable data) { bool isColumnWritten = true; int i = 0; int j = 0; int count = 0; IWorkbook workbook = new HSSFWorkbook(); try { //添加一个sheet ISheet sheet = workbook.CreateSheet("Sheet1"); //将数据逐步写入sheet1各个行 if (isColumnWritten == true) //写入DataTable的列名 { IRow row = sheet.CreateRow(0); for (j = 0; j < data.Columns.Count; ++j) { row.CreateCell(j).SetCellValue(data.Columns[j].ColumnName); } count = 1; } else { count = 0; } for (i = 0; i < data.Rows.Count; ++i) { IRow row = sheet.CreateRow(count); for (j = 0; j < data.Columns.Count; ++j) { row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString()); } ++count; } // 写入到客户端 MemoryStream ms = new System.IO.MemoryStream(); workbook.Write(ms); ms.Seek(0, SeekOrigin.Begin); return ms; } catch (Exception ex) { throw ex; Console.WriteLine("Exception: " + ex.Message); return null; } } /// <summary> /// Excel导出成内存流 /// </summary> /// <param name="data"></param> /// <returns></returns> public static MemoryStream DataTableToExcel(List<DataTable> dtList, List<string> nameList) { IWorkbook workbook = new HSSFWorkbook(); try { var data = dtList[0]; for (var i = 0; i < dtList.Count(); i++) { ISheet sheet = string.IsNullOrWhiteSpace(nameList[i]) ? workbook.CreateSheet("Sheet" + (i + 1)) : workbook.CreateSheet(nameList[i]); WriteSheet(dtList[i], sheet); } // 写入到客户端 MemoryStream ms = new System.IO.MemoryStream(); workbook.Write(ms); ms.Seek(0, SeekOrigin.Begin); return ms; } catch (Exception ex) { throw ex; Console.WriteLine("Exception: " + ex.Message); return null; } } private static void WriteSheet(DataTable data, ISheet sheet, bool isColumnWritten = true) { int i = 0; int j = 0; int count = 0; //将数据逐步写入sheet1各个行 if (isColumnWritten == true) //写入DataTable的列名 { IRow row = sheet.CreateRow(0); for (j = 0; j < data.Columns.Count; ++j) { row.CreateCell(j).SetCellValue(data.Columns[j].ColumnName); } count = 1; } else { count = 0; } for (i = 0; i < data.Rows.Count; ++i) { IRow row = sheet.CreateRow(count); for (j = 0; j < data.Columns.Count; ++j) { row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString()); } ++count; } } /// <summary> /// 去除空行 /// </summary> /// <param name="dtr"></param> /// <returns></returns> protected static DataTable RemoveEmpty(DataTable dtr) { DataTable dt = dtr; List<DataRow> removelist = new List<DataRow>(); for (int i = 0; i < dt.Rows.Count; i++) { bool IsNull = true; for (int j = 0; j < dt.Columns.Count; j++) { if (!string.IsNullOrEmpty(dt.Rows[i][j].ToString().Trim())) { IsNull = false; } } if (IsNull) { removelist.Add(dt.Rows[i]); } } for (int i = 0; i < removelist.Count; i++) { dt.Rows.Remove(removelist[i]); } return dt; } } }