《C#程序设计》第三次作业 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];
}

}
}