[C#] NPOI Excel解析

通过NPOI解析Excel，将数据保存到DataTable中。

        #region excel解析
        public DataTable ImportExcelFile(string filePath)
        {
            string extension = System.IO.Path.GetExtension(filePath);  //excel获取文件后缀
            DataTable table = new DataTable();
            using (FileStream fs = File.OpenRead(filePath))
            {
                IWorkbook wk = null;
                if (extension.Equals(".xls"))  //根据文件版本实例化对象
                {
                    wk = new HSSFWorkbook(fs);
                }
                else
                {
                    wk = new XSSFWorkbook(fs);
                }

                ISheet sheet = wk.GetSheetAt(0);   //获取excel的第一个sheet

                IRow row = sheet.GetRow(0); //获取sheet的首行

                int cellCount = row.LastCellNum;//一行最后一个方格的编号 即总的列数

                for (int i = row.FirstCellNum; i < cellCount; i++)
                {
                    DataColumn column = new DataColumn(row.GetCell(i).StringCellValue);
                    table.Columns.Add(column);
                }

                int rowCount = sheet.LastRowNum;  //最后一列的标号，即总的行数

                for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++)
                {
                    IRow rows = sheet.GetRow(i);
                    DataRow dataRow = table.NewRow();

                    for (int j = rows.FirstCellNum; j < cellCount; j++)
                    {
                        //if (rows.GetCell(j) != null)
                        // {
                        //  if (rows.GetCell(j).CellType == CellType.Numeric)
                        //dataRow[j] = rows.GetCell(j).RichStringCellValue;

                        dataRow[j] = rows.GetCell(j).ToString();
                        // }
                    }
                    table.Rows.Add(dataRow);
                }
            }
            return table;
        }
        #endregion