using System;
using System.Data;
using System.IO;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using NPOI.HSSF.UserModel;namespace MakeData
{public class ReadExcelHelper{/// <summary>/// 将excel导入到datatable/// </summary>/// <param name="filePath">excel路径</param>/// <param name="isColumnName">第一行是否是列名</param>/// <returns>返回datatable</returns>public static DataTable ExcelToDataTable(string filePath, bool isColumnName){DataTable dataTable = null;FileStream fs = null;DataColumn column = null;DataRow dataRow = null;IWorkbook workbook = null;ISheet sheet = null;IRow row = null;ICell cell = null;int startRow = 0;try{using (fs = File.OpenRead(filePath)){// 2007版本if (filePath.IndexOf(".xlsx") > 0)workbook = new XSSFWorkbook(fs);// 2003版本else if (filePath.IndexOf(".xls") > 0)workbook = new HSSFWorkbook(fs);if (workbook != null){sheet = workbook.GetSheetAt(0);//读取第一个sheet，当然也可以循环读取每个sheetdataTable = new DataTable();if (sheet != null){int rowCount = sheet.LastRowNum;//总行数if (rowCount > 0){IRow firstRow = sheet.GetRow(0);//第一行int cellCount = firstRow.LastCellNum;//列数//构建datatable的列if (isColumnName){startRow = 1;//如果第一行是列名，则从第二行开始读取for (int i = firstRow.FirstCellNum; i < cellCount; ++i){cell = firstRow.GetCell(i);if (cell != null){if (cell.StringCellValue != null){column = new DataColumn(cell.StringCellValue);dataTable.Columns.Add(column);}}}}else{for (int i = firstRow.FirstCellNum; i < cellCount; ++i){column = new DataColumn("column" + (i + 1));dataTable.Columns.Add(column);}}//填充行for (int i = startRow; i <= rowCount; ++i){row = sheet.GetRow(i);if (row == null) continue;dataRow = dataTable.NewRow();for (int j = row.FirstCellNum; j < cellCount; ++j){cell = row.GetCell(j);if (cell == null){dataRow[j] = "";}else{//CellType(Unknown = -1,Numeric = 0,String = 1,Formula = 2,Blank = 3,Boolean = 4,Error = 5,)switch (cell.CellType){case CellType.Blank:dataRow[j] = "";break;case CellType.Numeric:short format = cell.CellStyle.DataFormat;//对时间格式（2015.12.5、2015/12/5、2015-12-5等）的处理if (format == 14 || format == 31 || format == 57 || format == 58)dataRow[j] = cell.DateCellValue;elsedataRow[j] = cell.NumericCellValue;break;case CellType.String:dataRow[j] = cell.StringCellValue;break;}}}dataTable.Rows.Add(dataRow);}}}}}return dataTable;}catch (Exception ex){string mess = ex.Message;if (fs != null){fs.Close();}return null;}}}
}