C#读取Excel文件，并保存为文本文件

using System;

    using System.Collections.Generic;

    using System.ComponentModel;

    using System.Data;

    using System.Drawing;

    using System.Linq;

    using System.Text;

    using System.Threading.Tasks;

    using System.Windows.Forms;

    using System.Data.OleDb;

    using System.IO;

    using System.Data.SqlClient;

namespace Excel  
{  
    public partial class Form1 : Form  
    {  
        //全局变量,文件全路径  
        private string stFilePath = string.Empty;  
        public Form1()  
        {  
            InitializeComponent();  
        }  
        private void Form1_Load(object sender, EventArgs e)  
        {  
            DataTable myT = ExcelToDataTable("D:/ex03_demo.xls", "sheet1");  
            String mystr = myT.Rows[0][0].ToString();  

            //用listview1显示打开的excel  
            this.listView1.GridLines = true;//显示表格线  
            this.listView1.View = View.Details;//列表显示方式  
            this.listView1.Scrollable = true;//有滚动条  
            listView1.FullRowSelect = true;//是否选中整行  

            //设置表头  
            for (int i = 0; i < 9; i++)  
            {  
                this.listView1.Columns.Add("lie" + i, myT.Rows[0][i].ToString());  
            }  

            //设置表的内容  
            for (int j = 1; j < 47; j++)  
            {  
                ListViewItem item = new ListViewItem();  
                item.SubItems.Clear();  
                item.SubItems[0].Text = myT.Rows[j][0].ToString();  
                for (int k = 1; k < 9; k++)  
                {  
                    item.SubItems.Add(myT.Rows[j][k].ToString());  
                }  
                listView1.Items.Add(item);  
            }  

            //自适应宽度，-1根据内容设置宽度，-2根据标题设置宽度  
            for (int i = 0; i < 9; i++)  
            {  
                listView1.Columns["lie" + i].Width = -1;  
                listView1.Columns["lie" + i].Width = -2;  
            }  
        }  


        //将姓名和作业网址用txt存放于bin目录下  
        private void button1_Click(object sender, EventArgs e)  
        {  
            //此处的文本文件在工程下Bin的程序集目录下  
            stFilePath = Application.StartupPath.Trim() + "//ex03_demo" + ".txt";  
            StreamWriter swStream;  
            if (File.Exists(stFilePath))  
            {  
                swStream = new StreamWriter(stFilePath);  
            }  
            else  
            {  
                swStream = File.CreateText(stFilePath);  
            }  
            for (int i = 0; i < listView1.Items.Count; i++)  
            {  
                for (int j = 4; j <= 6; j += 2)  
                {  
                    string temp = listView1.Items[i].SubItems[j].Text;  
                    swStream.Write(temp);  
                    //插入------分隔符  
                    swStream.Write("--------");  
                }  
                swStream.WriteLine();  
            }  
            //关闭流，释放资源  
            swStream.Flush();  
            swStream.Close();  
            MessageBox.Show("已成功保存在bin目录下");  
        }  
        public static DataTable ExcelToDataTable(string strExcelFileName, string strSheetName)  
        {  
            //源的定义  
            string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + strExcelFileName + ";" + "Extended Properties='Excel 8.0;HDR=NO;IMEX=1';";  

            //Sql语句  
            //string strExcel = string.Format("select * from [{0}$]", strSheetName); 这是一种方法  
            string strExcel = "select * from   [sheet1$]";  

            //定义存放的数据表  
            DataSet ds = new DataSet();  

            //连接数据源  
            OleDbConnection conn = new OleDbConnection(strConn);  

            conn.Open();  

            //适配到数据源  
            OleDbDataAdapter adapter = new OleDbDataAdapter(strExcel, strConn);  
            adapter.Fill(ds, strSheetName);  

            conn.Close();  

            return ds.Tables[strSheetName];  
        }  


    }  
}  </pre>