个人学习代码保存:例11.读取Excel文件中的数据

前台代码：Default.aspx

<% @ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default"  %>

<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >

< html  xmlns ="http://www.w3.org/1999/xhtml"   >
< head  runat ="server" >
     < title > 无标题页 </ title >
</ head >
< body >
     < form  id ="form1"  runat ="server" >
     < div >
         < asp:GridView  ID ="GridView1"  runat ="server" >
         </ asp:GridView >
    
     </ div >
     </ form >
</ body >
</ html >

后台代码：Default.aspx.cs

using  System;
using  System.Data;
using  System.Configuration;
using  System.Web;
using  System.Web.Security;
using  System.Web.UI;
using  System.Web.UI.WebControls;
using  System.Web.UI.WebControls.WebParts;
using  System.Web.UI.HtmlControls;

using  System.Data.OleDb;


public   partial   class  _Default : System.Web.UI.Page 
{
    private static string connstr=ConfigurationManager.AppSettings["ConnectionString"].ToString();
    private static string dbpath = ConfigurationManager.AppSettings["DBPATH"].ToString();
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            this.GridView1.DataSource = CreateDataSource();
            this.GridView1.DataBind();
        }
    }

    private DataSet CreateDataSource()
    {
        String ExcelDBPath = connstr + Server.MapPath(dbpath) + ";";
        OleDbConnection conn = new OleDbConnection(ExcelDBPath);
        OleDbDataAdapter myCommand = new OleDbDataAdapter("SELECT * FROM [Sheet1$]", conn);
        DataSet myDataSet = new DataSet();
        myCommand.Fill(myDataSet);
        return myDataSet;
    }
}

web.config

<? xml version="1.0" ?>
< configuration  xmlns ="http://schemas.microsoft.com/.NetConfiguration/v2.0" >
     < appSettings >
         < add  key ="ConnectionString"  value ="Provider=Microsoft.Jet.OLEDB.4.0; Extended Properties=Excel 8.0;Data Source=" />
         < add  key ="DBPATH"  value ="ExcelDB\username.xls" ></ add >
     </ appSettings >
     < system.web >
         < compilation  debug ="true" /></ system.web ></ configuration >