新手提问--导出EXCEL报错，请帮忙指出

Question

在导出excel时报错，报错及代码如下
public void Output_Excel(System.Web.UI.Control ctl) 
    {
        HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".xls");
        HttpContext.Current.Response.Charset = "UTF-8";
        HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.Default;
        HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";
        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();
    }错误提示为：类别GridView的控制项GridView1必须置于有runat=server的表单标记之中aspx原始档：
<asp:GridView ID="GridView1" runat="server" Height="171px" Width="799px" OnSelectedIndexChanged="GridView1_SelectedIndexChanged" OnRowDataBound="GridView1_RowDataBound">
            </asp:GridView>

Answer 1

本帖最后由 net_lover 于 2012-02-13 11:09:16 编辑

  

Answer 2

是在public void Output_Excel(System.Web.UI.Control ctl) 那里加上关键子 override 吗

Answer 3

 加入后下面的代码报错 
  public override void VerifyRenderingInServerForm(Control control)
    {
        base.VerifyRenderingInServerForm(control);
    }错误提示为：类别GridView的控制项GridView1必须置于有runat=server的表单标记之中

Answer 4

看一下你的page里面有没有<form>这个标签。要带属性runat=server