Question

我通过ObjectDataSource中的GridView在Sql数据库中显示一些数据。我还允许用户使用以下代码将数据导出到Excel：

  public override void VerifyRenderingInServerForm(Control control)
{

}



private void ExportGridToExcel()
{
    Response.Clear();
    Response.Buffer = true;
    Response.ClearContent();
    Response.ClearHeaders();
    Response.Charset = "";
    string FileName = "Results" + DateTime.Now + ".xls";
    StringWriter strwritter = new StringWriter();
    HtmlTextWriter htmltextwrtter = new HtmlTextWriter(strwritter);
    Response.Cache.SetCacheability(HttpCacheability.NoCache);
    Response.ContentType = "application/vnd.ms-excel";
    Response.AddHeader("Content-Disposition", "attachment;filename=" + FileName);
    GridView1.GridLines = GridLines.Both;
    GridView1.HeaderStyle.Font.Bold = true;
    GridView1.RenderControl(htmltextwrtter);
    Response.Write(strwritter.ToString());
    Response.End();

}


protected void Button3_Click(object sender, EventArgs e)
{
    ExportGridToExcel();
}

一切正常。但是，当我在AllowSorting=true中设置GridView并单击导出按钮时出现以下错误：ystem.InvalidOperationException：

只能在Render（）;
期间调用RegisterForEventValidation

这不是一个大问题，因为我不一定需要在GridView中进行排序，但我很好奇这个问题是什么？

Answer 1

将此属性添加到@ Page声明：

EnableEventValidation="false"

当AllowSorting设置为true时，将GridView导出到Excel不起作用

1 个答案: