Execl的导入导出到DataSet

界面：

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

<!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></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
            CellPadding="4" ForeColor="#333333" GridLines="None">
            <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
            <Columns>
                <asp:BoundField DataField="UserId" HeaderText="用户ID" />
                <asp:BoundField DataField="UserName" HeaderText="用户名" />
                <asp:BoundField DataField="Sex" HeaderText="性别" />
                <asp:BoundField DataField="Age" HeaderText="年龄" />
            </Columns>
            <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
            <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
            <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
            <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
            <EditRowStyle BackColor="#999999" />
            <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
        </asp:GridView>

    </div>
    <asp:Button ID="btnOut" runat="server" Text="导出" onclick="btnOut_Click" />
    <asp:Button ID="btnIn" runat="server" Text="导入" onclick="btnIn_Click" />
<input id="File1" type="file" runat="server" /><asp:GridView ID="GridView2" runat="server" AutoGenerateColumns="False"
        BackColor="White" BorderColor="#DEDFDE" BorderStyle="None" BorderWidth="1px"
        CellPadding="4" ForeColor="Black" GridLines="Vertical">
        <RowStyle BackColor="#F7F7DE" />
        <Columns>
                <asp:BoundField DataField="用户名" HeaderText="用户名" />
                <asp:BoundField DataField="性别" HeaderText="性别" />
                <asp:BoundField DataField="年龄" HeaderText="年龄" />
            </Columns>
        <FooterStyle BackColor="#CCCC99" />
        <PagerStyle BackColor="#F7F7DE" ForeColor="Black" HorizontalAlign="Right" />
        <SelectedRowStyle BackColor="#CE5D5A" Font-Bold="True" ForeColor="White" />
        <HeaderStyle BackColor="#6B696B" Font-Bold="True" ForeColor="White" />
        <AlternatingRowStyle BackColor="White" />
    </asp:GridView>
    </form>
</body>
</html>

CS：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Text;
using System.Data.SqlClient;
using Excel;
using System.Data.OleDb;

public partial class index : System.Web.UI.Page
{
    private const string strConn = "自己写连接字符串";
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            BindDataToGridView();
        }
    }

    /// <summary>
    /// 绑定
    /// </summary>
    private void BindDataToGridView()
    {
        SqlConnection conn = new SqlConnection(strConn);
        string strSQL = "select * from [User]";
        SqlDataAdapter da = new SqlDataAdapter(strSQL, conn);
        DataSet ds = new DataSet();
        da.Fill(ds, "[User]");
        this.GridView1.DataSource = ds;
        this.GridView1.DataKeyNames = new string[] { "UserId" };
        this.GridView1.DataBind();
    }

    /// <summary>
    /// 导出DataSet到Execl
    /// </summary>
    private void OutExecl()
    {
        Excel.Application myExcel = new Excel.Application();
        myExcel.Visible = true;

        if (myExcel == null)
        {
            Page.RegisterStartupScript("", "<script>alert('EXCEL无法启动');</script>");
        }

        Workbook work = myExcel.Application.Workbooks.Add(Type.Missing);
        Worksheet sheet = (Worksheet)work.Worksheets[1];

        int rowCount = 0;
        int columnCount = 0;

        columnCount = this.GridView1.Columns.Count;
        rowCount = this.GridView1.Rows.Count;

        rowCount--;

        for (int m = 1; m < columnCount; m++)
        {
            sheet.Cells[1, m] = this.GridView1.Columns[m].HeaderText;//得到列标题文本
        }

        for (int i = 0; i <= rowCount; i++)  //二维表填充从每一行开始
        {
            for (int j = 1; j < columnCount; j++)      //填充每一行第j列单元格，循环添加行列数据
            {
                sheet.Cells[i + 2, j] = this.GridView1.Rows[i].Cells[j].Text;
            }
        }
        Page.RegisterStartupScript("", "<script>alert('成功导出！');</script>");
    }

    /// <summary>
    /// 导出
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void btnOut_Click(object sender, EventArgs e)
    {
        OutExecl();
    }

    /// <summary>
    /// 导入Excel到DataSet
    /// </summary>
    /// <param name="filePath"></param>
    /// <returns></returns>
    private DataSet InExecl(string filePath)
    {
        DataSet ds = new DataSet();
        string connStr = "Provider = Microsoft.Jet.OLEDB.4.0; Data Source = " + filePath + ";Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=1\"";

        OleDbConnection myConn = new OleDbConnection(connStr);
        string strSQL = " SELECT * FROM [Sheet1$]";
        myConn.Open();
        OleDbDataAdapter myCommand = new OleDbDataAdapter(strSQL, myConn);
        DataSet myDataSet = new DataSet();
        myCommand.Fill(myDataSet, "[Sheet1$]");
        myConn.Close();

        return myDataSet;
    }

    /// <summary>
    /// 导入
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void btnIn_Click(object sender, EventArgs e)
    {
        DataSet ds = InExecl(this.File1.PostedFile.FileName);
        this.GridView2.DataSource = ds;
        this.GridView2.DataBind();
    }
}
自己在项目中遇到的导入导出在网上搜索资料，然后自己做了一些小修改，提供给用的到的朋友，以上注意的是在DataSet ds = InExecl(this.File1.PostedFile.FileName);那个WEB的上传控件只能得到文件名this.FileUpload1.FileName 这个取的不是全路径，改用HTML的 input file控件设置为作为服务器端运行
this.File1.PostedFile.FileName;就是全路径了。