C#中读取EXCEL文件的第二种方法

using NPOI.HSSF.UserModel;
using System;
using System.IO;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;

namespace ReadExcel
{
    class Program
    {
        static void Main(string[] args)
        {
            //新建IWorkbook
            IWorkbook workbook = null;
            string fileName = @"D:\txts\gl.xlsx";
            FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read);
            if (fileName.IndexOf(".xlsx") > 0)
            {
                //xlsx数据读入workbook
                workbook = new XSSFWorkbook(fileStream);
            }
            else if (fileName.IndexOf(".xls") > 0)
            {
                //xls数据读入workbook
                workbook = new HSSFWorkbook(fileStream);
            }
            ISheet sheet = workbook.GetSheetAt(0);//获取第一个工作表
            IRow row;
            for (int i = 0; i <= sheet.LastRowNum; i++)
            {
                //遍历該工作表的每一行
                row = sheet.GetRow(i);
                //if (row != null)
                //{
                //    for (int j = 0; j < row.LastCellNum; j++)
                //    {
                //获取行第一列数据
                string cellValue = row.GetCell(0).ToString();
                Console.WriteLine(cellValue);
                //    }
            }
            //}
            Console.ReadKey();
           //关闭
            fileStream.Close();
            workbook.Close();
        }
    }
}