Excel导出

using System;
using System.Collections;
using System.Configuration;
using System.Data;
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.Data.SqlClient;
using System.IO;
using System.Text;
using System.Drawing;
using System.Data.OleDb;
public partial class WExcel : System.Web.UI.Page
{
    private readonly string DSExcel = ConfigurationSettings.AppSettings["DSExcel"].ToString();
    private readonly string Excel = ConfigurationSettings.AppSettings["Excel"].ToString();
    public static string sqlcon = ConfigurationManager.ConnectionStrings["SQLConnetionString"].ToString();

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            binddata();
        }

    }

    private void binddata()
    {
        this.GridView1.DataSource = GetDataSet();
        this.GridView1.DataBind();
    }

    private DataSet GetDataSet()
    {
        string sql = "select * from Files";
        SqlConnection cn = new SqlConnection(sqlcon);
        cn.Open();
        SqlDataAdapter da = new SqlDataAdapter(sql, cn);
        DataSet ds = new DataSet();
        cn.Close();
        da.Fill(ds);
        return ds;

    }
 
    //导入到Excel
    private void Export(string FileType, string FileName)
    {
        Response.Charset = "GB2312";
        Response.ContentEncoding = System.Text.Encoding.UTF7;
        Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(FileName, Encoding.UTF8).ToString());
        Response.ContentType = FileType;
        this.EnableViewState = false;
        StringWriter tw = new StringWriter();
        HtmlTextWriter hw = new HtmlTextWriter(tw);
        GridView1.RenderControl(hw);
        Response.Write(tw.ToString());
        Response.End();
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        Export("application/ms-excel", "文件上传.xls");
    }

    //如果没有下面方法会报错类型“GridView”的控件“GridView1”必须放在具有 runat=server 的窗体标记内
    public override void VerifyRenderingInServerForm(Control control)
    {
    }


//读取Excel数据
    private DataSet CreateDataSource()
    {
        string strCon = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Server.MapPath("~\\App_Data\\excel.xls") + ";Extended Properties=Excel 8.0 ;";
        OleDbConnection olecon = new OleDbConnection(strCon);
       // string ExcelDbPath = DSExcel + Server.MapPath(Excel) + ";";
       // OleDbConnection olecon = new OleDbConnection(ExcelDbPath);
        OleDbDataAdapter myda = new OleDbDataAdapter("SELECT * FROM [Sheet1$]", olecon);
        DataSet myds = new DataSet();
        myda.Fill(myds);
        return myds;


    }


    protected void Button2_Click(object sender, EventArgs e)
    {
        GridView2.DataSource = CreateDataSource();
        GridView2.DataBind();
       
    }

    //生成Excel表格
  /**//*  private void CreateExcelTable()
    {
        DataSet ds = GetDataSet();
        //创建Excel对象
        Excel.Application excel = new Excel.Application();
        int rowIndex = 1;
        int collIndex = 0;
        //添加Excel对象的WorkBooks
        excel.Application.Workbooks.Add(true);
        DataTable table = ds.Tables[0];
        //将所得到的表的列名赋给Excel单元格
        foreach (DataColumn col in table.Columns)
        {//添加列名
            collIndex++;
            excel.Cells[1, collIndex] = col.ColumnName;

        }
        foreach (DataRow row in table.Rows)
        {//添加数据
            rowIndex++;
            collIndex = 0;
            foreach (DataColumn col in table.Columns)
            {
                collIndex++;
                excel.Cells[rowIndex, collIndex] = row[col.ColumnName].ToString();

            }

        }
        //不可见即后台处理
        excel.Visible = false;
        excel.DisplayAlerts = false;
        //保存刚才创建的Excel表格
        excel.Save(MapPath("App_Data/excel.xls"));
        excel.Application.Workbooks.Close();
        excel.Application.Quit();
        excel.Quit();
        //释放使用的Excel对象
        System.Runtime.InteropServices.Marshal.ReleaseComObject(excel);
        GC.Collect();//调用垃圾收集内存

    }
    
     */
  
}