"Unable to evaluate expression because the code is optimized or a native frame is on top of the stack" 同时将网格导出到 excel

Question

将选定的网格行导出到 excel 时出错。错误：无法计算表达式，因为代码已优化或本机框架位于堆栈顶部。

其实我想把选中的行从网格中导出到excel，这样用户就可以方便的下载选中的记录请参考导出代码到 excel Onclick 方法。

protected void btnExportExcel_Click(object sender, EventArgs e)
    {
                bool isSelected = false;
                foreach (GridViewRow i in gvDistrictSchoolReport.Rows)
                {
                    CheckBox cb = (CheckBox)i.FindControl("Chkbox");
                    if (cb != null && cb.Checked)
                    {
                        isSelected = true;
                        break;
                    }
                }
                if (isSelected)
                {
                    GridView gvExport = gvDistrictSchoolReport;
                    // this below line for not export checkbox to excel file
                    gvExport.Columns[0].Visible = false;
                    foreach (GridViewRow i in gvDistrictSchoolReport.Rows)
                    {
                        gvExport.Rows[i.RowIndex].Visible = false;
                        CheckBox cb = (CheckBox)i.FindControl("Chkbox");
                        if (cb != null && cb.Checked)
                        {
                            gvExport.Rows[i.RowIndex].Visible = true;
                        }
                    }
                    try
                    {
                        Response.Clear();
                        Response.Buffer = true;
                        Response.AddHeader("content-disposition", "attachment;filename=ExportGridData.xls");
                        Response.Charset = "";
                        Response.ContentType = "application/vnd.ms-excel";
                        StringWriter sw = new StringWriter();
                        HtmlTextWriter htW = new HtmlTextWriter(sw);
                        gvExport.RenderControl(htW);
                        Response.Output.Write(sw.ToString());
                        Response.Flush();
                        Response.End();

                    }
                    catch(Exception ex)
                    {
                        Console.WriteLine(ex);
                    }

                }
            }

Answer 1

如果您使用的是更新面板，请像这样使用 PostBack 触发器

<asp:UpdatePanel ID="up1" runat="server">
        <Triggers>
        <asp:PostBackTrigger ControlID="gvDistrictSchoolReport" /> -- for grid
             <asp:PostBackTrigger ControlID="Button6" />  -- for export to excel button
    </Triggers>

格子前。希望这会奏效

"Unable to evaluate expression because the code is optimized or a native frame is on top of the stack" 同时将网格导出到 excel

"Unable to evaluate expression because the code is optimized or a native frame is on top of the stack" while export the grid into excel

c#

asp.net

export-to-excel