asp.net - 验证渲染在服务器表单 : no suitable method found to override C# error

Question

我正在编写一个代码来导出到 Excel GridView 。我正在使用 updatepanel，因此整个页面不会加载。所以，我写了一个代码:

aspx.cs代码

protected void Export_click(object sender, EventArgs e)
    {
        GridView gv = (GridView)TBMMasterContentPalceHolder.FindControl("myGridView");
        Response.Clear();
        Response.AddHeader("content-disposition", "attachment;filename=Suppliers.xls");
        Response.Charset = "";
        Response.ContentType = "application/vnd.xls";
        System.IO.StringWriter stringWrite = new System.IO.StringWriter();
        System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
        gv.RenderControl(htmlWrite);
        Response.Write(stringWrite.ToString());
        Response.End();

    }
    public override void VerifyRenderingInServerForm(Control control) //To prevent Export To Excel Error
    {
    }

asp代码

<asp:Button ID="btnExport" runat="server" Text="  Export  " OnClick="Export_click" />
<Triggers>
        <asp:PostBackTrigger ControlID="btnExport" />
</Triggers>

但是在这里，我在 VerifyRenderingInServerForm(Control control) 函数中收到错误。错误是:

VerifyRenderingInServerForm(System.Web.UI.Control)': no suitable method found to override

如何解决这个错误？

Answer 1

我得到了答案。删除 VerifyRenderingInServerForm(Control control) 函数并使用

System.Web.UI.HtmlControls.HtmlForm form = new System.Web.UI.HtmlControls.HtmlForm();
            Controls.Add(form);
            form.Controls.Add(gv);
            form.RenderControl(htmlWrite);

所以，我们的最终代码是

Response.Clear();
            Response.AddHeader("content-disposition", "attachment;filename=myfile.xls");
            Response.Charset = "";
            Response.ContentType = "application/vnd.xls";
            System.IO.StringWriter stringWrite = new System.IO.StringWriter();
            System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);

            System.Web.UI.HtmlControls.HtmlForm form = new System.Web.UI.HtmlControls.HtmlForm();
            Controls.Add(form);
            form.Controls.Add(gv);
            form.RenderControl(htmlWrite);
            Response.Write(stringWrite.ToString());
            Response.End();