asp.net导出excel表方法汇总2010-11-051、由dataset生成
public void CreateExcel(DataSet ds,string typeid,string FileName)
{
 HttpResponse resp;
 resp = Page.Response;
 resp.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
 resp.AppendHeader("Content-Disposition", "attachment;filename=" + FileName);
 string colHeaders= "", ls_item="";
 int i=0;
 //定义表对象与行对像,同时用DataSet对其值进行初始化
 DataTable dt=ds.Tables[0];
 DataRow[] myRow=dt.Select("");
 // typeid=="1"时导出为EXCEL格式文件;typeid=="2"时导出为XML格式文件
 if(typeid=="1")
 {
//取得数据表各列标题,各标题之间以	分割,最后一个列标题后加回车符
for(i=0;i colHeaders+=dt.Columns[i].Caption.ToString()+"	";
colHeaders +=dt.Columns[i].Caption.ToString() +"
";
//向HTTP输出流中写入取得的数据信息
resp.Write(colHeaders);
//逐行处理数据
foreach(DataRow row in myRow)
{
 //在当前行中,逐列获得数据,数据之间以	分割,结束时加回车符
 for(i=0;ils_item +=row[i].ToString() + "	";
 ls_item += row[i].ToString() +"
";
 //当前行数据写入HTTP输出流,并且置空ls_item以便下行数据
 resp.Write(ls_item);
 ls_item="";
}
 }
 else
 {
if(typeid=="2")
{
 //从DataSet中直接导出XML数据并且写到HTTP输出流中
 resp.Write(ds.GetXml());
}
 }
 //写缓冲区中的数据到HTTP头文件中
 resp.End();
}
2、由datagrid生成
public void ToExcel(System.Web.UI.Control ctl) 
  {
  HttpContext.Current.Response.AppendHeader("Content-Disposition","attachment;filename=Excel.xls");
  HttpContext.Current.Response.Charset ="UTF-8";
  HttpContext.Current.Response.ContentEncoding =System.Text.Encoding.Default;
  HttpContext.Current.Response.ContentType ="application/ms-excel";//image/JPEG;text/HTML;image/GIF;vnd.ms-excel/msword
  ctl.Page.EnableViewState =false;
  System.IO.StringWriter tw = new System.IO.StringWriter() ;
  System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter (tw);
  ctl.RenderControl(hw);
  HttpContext.Current.Response.Write(tw.ToString());
  HttpContext.Current.Response.End();
 }用法:ToExcel(datagrid1);