C#使用RenderControl将GridView控件导出到EXCEL的方法

// 把GridView输出到Excel文件 
private void ExportExcel(GridView gridView,string title,string title2,string fileName)
{
  int nHideCols = 0;
  //如果不想输出出某列，将Visible设为false即可
  for (int i = 0; i < gridView.Columns.Count; i++)
  {
 if (gridView.Columns[i].HeaderText == "设备状态")
 {
   gridView.Columns[i].Visible = false;
   gridView.Columns[i].ControlStyle.Width = 0;
   nHideCols = 1;
   break;
 }
  }
  //设定显示字符集
  Response.Charset = "utf-8";
  //设定内容字符集
  Response.ContentEncoding = Encoding.GetEncoding("utf-8"); 

  //设定文件名
  Response.AppendHeader("Content-Disposition","attachment;filename=" + HttpUtility.UrlEncode(fileName,Encoding.UTF8).Replace('+','_').Replace('-','_'));
  //设定文件类型  也可以是application/ms-word,也可以是text/html（字符集设为gb2312）
  Response.ContentType = "application/ms-excel";
  this.EnableViewState = false;
  using (StringWriter tw = new StringWriter())
  {
 using (HtmlTextWriter hell = new HtmlTextWriter(tw))
 {
   gridView.AllowPaging = false;
   gridView.RenderControl(hell);
   string s = tw.ToString();
   s = s.Replace("rn","");
   int index = s.IndexOf("<tr");
   //可以自定义Excel文件的标题
   string head = "<tr><td colspan="" + (gridView.Columns.Count - nHideCols).ToString() + "" style="text-align: center; height: 42px; font-size: 24px; font-weight: bolder; color: #000000;">" + title + "</td></tr>" +
   "<tr><td colspan="" + (gridView.Columns.Count - nHideCols).ToString() + "" style="text-align: center; height: 24px; font-size: 12px; color: #000000;">" + title2 + "</td></tr>";
   //使用Index来判断是否存在数据，当然也可以用gridView.Rows.Count来判断
   if (index != -1)
   {
 //有数据的
 s = s.Insert(index,head);
   }
   else
   {
 //没有数据的时候
 s = "<table cellspacing="0" cellpadding="3" rules="rows" border="1" id="" + gridView.ID + "" style="background-color:White;border-color:#E7E7FF;border-width:1px;border-style:None;border-collapse:collapse;">" +
   head + "</table>";
   }
   Response.Write(s);
   Response.End();
 }
  }
}
//同时vs2005,vs2003会报错“类型“ExGridView”的控件“GridViewMaster”必须放在具有 runat=server 的窗体标记内
//需要添加下面取消对GridViewMaster 控件验证的方法
public override void VerifyRenderingInServerForm(Control control)
{
  if (!control.GetType().Equals(gridView.GetType()))
  {
 base.VerifyRenderingInServerForm(control);
  }
}