GridView数据的导入导出

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前台：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="GridView._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">
   <asp:GridView ID="GridView1" runat="server"    AutoGenerateColumns="False" CellPadding="3"
                         BackColor="White" BorderColor="#CCCCCC" BorderStyle="None" BorderWidth="1px" Font-Size="12px"   >
                        <FooterStyle BackColor="White" ForeColor="#000066" />
                        <Columns>
                            <asp:BoundField DataField="身份证号码" HeaderText="编号" ReadOnly="True" />
                            <asp:BoundField DataField="姓名" HeaderText="姓名" />
                            <asp:BoundField DataField="出生日期" HeaderText="出生日期" />
                            <asp:BoundField DataField="家庭住址" HeaderText="家庭住址" />
                            <asp:BoundField DataField="邮政编码" HeaderText="邮政编码" />
                            <asp:BoundField DataField="起薪" HeaderText="起薪" />

                        </Columns>
                        <RowStyle ForeColor="#000066" />
                        <SelectedRowStyle BackColor="#669999" Font-Bold="True" ForeColor="White" />
                        <PagerStyle BackColor="White" ForeColor="#000066" HorizontalAlign="Left" />
                        <HeaderStyle BackColor="#006699" Font-Bold="True" ForeColor="White" />
                    </asp:GridView>
        <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="导出" />
        <asp:Button ID="Button2" runat="server" onclick="Button2_Click" Text ="导入" />
    </form>
</body>
</html>

后台：

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Text;
using System.IO;
using System.Data.OracleClient;
using System.Data.OleDb;

namespace GridView
{
    public partial class _Default : System.Web.UI.Page
    {
        OracleConnection cn;
        //OracleCommand cmd;
        string strCon = "Data Source=192.168.1.103/orcl;User ID=system;Password=sa;Unicode=True";

        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                bind();
            }
        }
        public void bind()
        {
            string sqlStr = "select *from Employee";
            cn = new OracleConnection(strCon);
            OracleDataAdapter da = new OracleDataAdapter(sqlStr, cn);
            DataSet ds = new DataSet();
            cn.Open();
            da.Fill(ds, "Employee");
            GridView1.DataSource = ds;
            GridView1.DataKeyNames = new string[] { "身份证号码" };
            GridView1.DataBind();
            cn.Close();
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            Export("application/vnd.ms-excel", "学生成绩报表.xlsx");
        }

        private void Export(string FileType, string FileName)
        {
            Response.Charset = "GB2312";
            Response.ContentEncoding = System.Text.Encoding.UTF32;
            Response.AppendHeader("Content-Disposition", "attachment;filename=" +
               HttpUtility.UrlEncode(FileName, Encoding.UTF32).ToString());
            Response.ContentType = FileType;
            this.EnableViewState = false;
            //实现一个用于将信息写入字符串
            StringWriter tw = new StringWriter();
            HtmlTextWriter hw = new HtmlTextWriter(tw);
            GridView1.RenderControl(hw);
            Response.Write(tw.ToString());
            Response.End();
        }

        public override void VerifyRenderingInServerForm(Control control)
        {

        }

        private DataSet CreateDataSource()
        {
            string strCon;
            strCon = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Server.MapPath("Employee.xls") + "; Extended Properties=Excel 8.0;";
            OleDbConnection olecon = new OleDbConnection(strCon);
            OleDbDataAdapter myda = new OleDbDataAdapter("SELECT * FROM [Sheet1$]", strCon);
            DataSet myds = new DataSet();
            myda.Fill(myds);
            return myds;
        }

        protected void Button2_Click(object sender, EventArgs e)
        {
            GridView1.DataSource = CreateDataSource();
            GridView1.DataBind();
        }

    }
}