.Net导出数据到Excle

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.Data.OracleClient;
using System.Text;

public partial class ExportExcle : System.Web.UI.Page
{
  protected void Page_Load(object sender, EventArgs e)
  {

  }

 

  //导出Excel按钮
  protected void btnExport_Click(object sender, EventArgs e)
  {
    string connstring = "User Id=***;Password=***;Data Source=***";
    //实例化OracleConnection对象
    using (OracleConnection conn = new OracleConnection(connstring))
    {
      conn.Open();
      OracleDataAdapter oda=new OracleDataAdapter();
      DataSet ds = new DataSet();
      //实例化OracleCommand对象
      OracleCommand cmd = conn.CreateCommand();
      cmd.CommandText = "select * from Table where rownum <=10";
      oda.SelectCommand = cmd;
      oda.Fill(ds,"table");

      if (ds != null)
      {
        string CSVstring = ExportCSV(ds.Tables[0]);
        System.Web.HttpContext.Current.Response.Clear();
        System.Web.HttpContext.Current.Response.ClearHeaders();
        System.Web.HttpContext.Current.Response.ClearContent();
        System.Web.HttpContext.Current.Response.ContentType = "applicationshlnd.xls";
        System.Web.HttpContext.Current.Response.AddHeader("content-disposition", "attachment; filename=" + System.Web.HttpUtility.UrlEncode("Excel文件名", System.Text.Encoding.UTF8) + ".xls");
        byte[] csvBytes = Encoding.Unicode.GetBytes(CSVstring);
        System.Web.HttpContext.Current.Response.AddHeader("Content-Length", (csvBytes.Length + 2).ToString());
        System.Web.HttpContext.Current.Response.BinaryWrite(new byte[] { 0xFF, 0xFE });
        System.Web.HttpContext.Current.Response.BinaryWrite(csvBytes);
        System.Web.HttpContext.Current.Response.Flush();
        System.Web.HttpContext.Current.Response.End();

      }
    }
  }

 

  public string ExportCSV(DataTable table)
  {
    System.Text.StringBuilder output =new System.Text.StringBuilder();
    string delim;
    output.Append("<table border=\"1\" cellspacing=\"0\" cellpadding=\"0\">");
    delim = "";
    output.Append("<tr>");

    foreach(DataColumn col in table.Columns)
    {
      output.Append("<td style=\"vnd.ms-excel.numberformat:@\">");
      output.Append(col.ColumnName);
      output.Append("</td>");
    }
    output.Append("</tr>");

    foreach(DataRow row in table.Rows)
    {
      delim ="";
      output.Append("<tr>");

      foreach(Object value in row.ItemArray)
      {
        output.Append("<TD style=\"vnd.ms-excel.numberformat:@\">");
        output.Append(value.ToString());
        output.Append("</TD>");
      }
      output.Append("</tr>");
    }
    output.Append("</table>");

    return output.ToString();
  }

}

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