C#：GridView导出Excel，以及runat=server错误处理方法

例如，你有个按钮需要点击它就会把当前显示导出Excel，按钮例子如下

<asp:LinkButton ID="LinkToExcel" runat="server" OnClick="LinkToExcel_Click">导出报表</asp:LinkButton>

双击按钮就会在语句中生成按钮方法，本例中就是红色字体部分，

然后在后台把如下代码复制进去

    protected void LinkToExcel_Click(object sender, EventArgs e)
    {
        string style = @"<style> .text { } </script> ";
        Response.Clear();
        Response.Buffer = true;
        Response.Charset = "GB2312"; //请勿删除此行，否则会出现乱码
        Response.AppendHeader("Content-Disposition", "attachment; filename =NewFileName.xls");
        Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");      //设置输出流为简体中文
        Response.ContentType = "application/ms-excel";                              //设置输出文件类型为excel文件
        this.EnableViewState = false;
        System.Globalization.CultureInfo myCItrad = new System.Globalization.CultureInfo("ZH-CN", true);
        System.IO.StringWriter oStringWriter = new System.IO.StringWriter(myCItrad);
        System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);
        this.GridView1.RenderControl(oHtmlTextWriter);
        Response.Write(style);
        Response.Write(oStringWriter.ToString());
        Response.End();
    }

//以下的代码务必要加在上面一段后面，

    public override void VerifyRenderingInServerForm(Control control)
    {
        // 覆盖VerifyRenderingInServerForm方法，非常重要，否则系统会报错
        //base.VerifyRenderingInServerForm(control);
    }

//否则会出现错误：

//Control 'GridView1' of type 'GridView' must be placed inside a form tag with runat=server.