C# 带有导出到Excel的复选框的Gridview在打开时会长时间挂起

我正在对一个Gridview问题进行故障排除，该Gridview带有大量导出到Excel的复选框（下面的示例代码。实际代码包括更多复选框）。发生的情况是：1）用户单击按钮开始导出过程，然后2）用户将文件保存或下载到桌面，3）文件需要相当长的时间来呈现基本单元格（>15秒），然后，一旦基本excel文件呈现3）电子表格呈现复选框（渲染时间从3到10分钟不等，具体取决于计算机的速度），并显示为挂起，直到复选框显示为与GridView中的复选框相同

我还应该注意，这个示例文件大约为800k，我几乎可以立即将其他更大的GridView导出到Excel，而无需复选框

我知道，在将网页中实际导出的文件保存为spereadsheet/工作簿之前，它不是Excel文件。但是，带有复选框的gridview需要很长时间才能呈现为“电子表格”，这似乎有点奇怪

我的问题是-这是导出带有复选框的excel电子表格的正常行为，还是有什么方法可以改进下面的代码以确保excel电子表格在打开时不会长时间挂起？是否有其他解决方案可以帮助加快复选框的呈现时间

aspx代码

<%@ Page Title="Test Page" Language="C#" MasterPageFile="~/Site.master" EnableEventValidation="false" AutoEventWireup="true" CodeFile="form2.aspx.cs" Inherits="form2" %>
    <asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" Runat="Server"></asp:Content>
    <asp:Content ID="Content2" ContentPlaceHolderID="FeaturedContent" Runat="Server"></asp:Content>
    <asp:Content ID="Content3" ContentPlaceHolderID="MainContent" Runat="Server">
  <asp:Button ID="Button1" runat="server" Height="38px"  OnClick="Button1_CLick" Text="Export to Excel" Width="200px" />
  <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CellPadding="4" DataSourceID="SqlDataSource1" ForeColor="#333333" GridLines="None">
    <AlternatingRowStyle BackColor="White" />
    <Columns>
        <asp:CommandField ShowEditButton="True" />
        <asp:BoundField DataField="Field 1" HeaderText="Field 1" SortExpression="Field 1" />
        <asp:BoundField DataField="Field 2" HeaderText="Field 2" SortExpression="Field 2" />
        <asp:BoundField DataField="Field 3" HeaderText="Field 3" SortExpression="Field 3" />
        <asp:BoundField DataField="Field 4" HeaderText="Field 4" SortExpression="Field 4" />
        <asp:BoundField DataField="Field 5" HeaderText="Field 5" SortExpression="Field 5" />
        <asp:BoundField DataField="Field 6" HeaderText="Field 6" SortExpression="Field 6" />
        <asp:BoundField DataField="Field 7" HeaderText="Field 7" SortExpression="Field 7" />
        <asp:BoundField DataField="Field 8" HeaderText="Field 8" SortExpression="Field 8" />
        <asp:BoundField DataField="Field 9" HeaderText="Field 9" SortExpression="Field 9" />
      <asp:Panel ID="pnlClick" runat="server" CssClass="collapsiblepanelCSS">
          <div style="background-color:blue;height:30px; vertical-align: middle">
              <div style="float: left;color:white;padding: 5px 5px 0 0 ">
                  Server List Collapsable Panel
              </div>
              <div style="float: right; color: white; padding: 5px 5px 0 0" id="divshow">
                  <asp:Label ID="lblMessage" runat="server" Text="Label" />
                  </div>
              <div style="clear:both">
            </div>
                </div>
              </asp:Panel>
        <asp:Panel ID="pnlCollapsable" runat="server" Height="0" CssClass="collapsiblepanelCSS">
        <asp:CheckBoxField DataField="Check Box 1" HeaderText="Check Box 1" SortExpression="Check Box 1" />
        <asp:CheckBoxField DataField="Check Box 2" HeaderText="Check Box 2" SortExpression="Check Box 2" />
        <asp:CheckBoxField DataField="Check Box 3" HeaderText="Check Box 3" SortExpression="Check Box 3" />
        <asp:CheckBoxField DataField="Check Box 4" HeaderText="Check Box 4" SortExpression="Check Box 4" />
        <asp:CheckBoxField DataField="Check Box 5" HeaderText="Check Box 5" SortExpression="Check Box 5" />
        <asp:CheckBoxField DataField="Check Box 6" HeaderText="Check Box 6" SortExpression="Check Box 6" />
        <asp:CheckBoxField DataField="Check Box 7" HeaderText="Check Box 7" SortExpression="Check Box 7" />
        <asp:CheckBoxField DataField="Check Box 8" HeaderText="Check Box 8" SortExpression="Check Box 8" />
        <asp:CheckBoxField DataField="Check Box 9" HeaderText="Check Box 9" SortExpression="Check Box 9" />
        <asp:CheckBoxField DataField="Check Box 10" HeaderText="Check Box 10" SortExpression="Check Box 10" />
        <asp:CheckBoxField DataField="Check Box 11" HeaderText="Check Box 11" SortExpression="Check Box 11" />
        <asp:CheckBoxField DataField="Check Box 12" HeaderText="Check Box 12" SortExpression="Check Box 12" />
          </asp:Panel>
        <CC1:CollapsiblePanelExtender ID="CollapsiblePanelExtender1" Collapsed="true" ExpandControlID="pnlClick" TextLabelID="lblMessage" CollapsedText="Click To Show" ExpandedText="Click To Hide" ImageControlID="imgArrows" ExpandDirection="Vertical" TargetControlID="pnlCollapsable" ScrollContents="false" runat="server"></CC1:CollapsiblePanelExtender>

        <asp:BoundField DataField="Field 10" HeaderText="Field 10" SortExpression="Field 10" />
        <asp:BoundField DataField="Field 11" HeaderText="Field 11" SortExpression="Field 11" />
        <asp:BoundField DataField="Field 12" HeaderText="Field 12" SortExpression="Field 12" />
        <asp:CommandField ShowEditButton="True" />
    </Columns>
    <EditRowStyle BackColor="#2461BF" />
    <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
    <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
    <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
    <RowStyle BackColor="#EFF3FB" />
    <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
    <SortedAscendingCellStyle BackColor="#F5F7FB" />
    <SortedAscendingHeaderStyle BackColor="#6D95E1" />
    <SortedDescendingCellStyle BackColor="#E9EBEF" />
    <SortedDescendingHeaderStyle BackColor="#4870BE" />
</asp:GridView>

<sql connection strings, insert/update SQL code, update parameters, and closing ASP/HTML tags>

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经过一些研究，我确定从gridview导出到Excel的大量复选框（特别是当gridview相当大时）需要相当长的时间才能将所有复选框正确地呈现到最终产品

诚然，导出的Excel文档在专门保存为电子表格之前不是真正的电子表格。我只是想记录下，导出时复选框呈现过程需要相当长的时间。也许可以这样做，以使该过程在未来版本的产品中不会太长在标签中

   using System;
   using System.Configuration;
   using System.Data;
   using System.Collections.Generic;
   using System.Linq;
   using System.Web;
   using System.Web.UI;
   using System.Web.UI.WebControls;

   public partial class form2 : system.Web.UI.Page
   {

        protected void Page_Load(object sender, EventArgs e)
        {

        }

        public override void VerifyRenderingInServerForm(Control control)
        {

        }

        protected void Button1_Click(object sender, EventArgs e)
        {
              Response.Clear();
              Response.AddHeader("content-disposition", "attachement;filename=FileNAme.xls");
              Response.ContentType = "application/vnd.xlsx";
              System.IO.StringWriter stringWrite = new System.IO.StringWriter();
              System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
              GridView1.RenderControl(htmlWrite);
              Response.Write(stringWrite.ToString());
              Response.End();
        }


    }