我正在解决一个带有大量复选框的 Gridview 问题，该问题带有导出到 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他们的桌面，3) 文件需要相当长的时间来渲染基本单元格 (> 15秒），然后一旦基本的 excel 文件呈现 3）电子表格呈现复选框（呈现时间需要 3 到 10 分钟，具体取决于计算机的速度）并且似乎挂起，直到复选框出现在 GridView 中。
我还应该注意，这个示例文件大约是 800k，我几乎可以立即将其他较大的网格视图导出到 Excel，而无需复选框。
我知道从网页实际导出的文件不是真正的 Excel 文件，直到您将其保存为电子表格/工作簿。但是，带有复选框的网格视图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？有没有其他解决方案可以帮助加快复选框渲染时间？
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>
.cs 文件
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();
}
}