单击按钮后缺少Gridview

在页面加载时,我将加载带有标题的空gridview。我不想离开。

 <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Portfolio.aspx.cs" Inherits="PortFolio.Portfolio" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" ShowHeaderWhenEmpty="true">
                <Columns>
                    <asp:BoundField DataField="Parent" HeaderText="Parent" HeaderStyle-Width="175px" />
                    <asp:BoundField DataField="Child" HeaderText="Child" HeaderStyle-Width="175px" />
                    <asp:TemplateField>
                    <HeaderTemplate>
                        <asp:CheckBox ID="CheckboxSelectAll" onclick="HeaderCheckBoxClick(this);" runat="server" />
                    </HeaderTemplate>
                    <ItemTemplate>
                            <asp:CheckBox ID="CheckBox1" runat="server" onclick="ChildCheckBoxClick(this);" />
                        </ItemTemplate>
                </asp:TemplateField>
                </Columns>
            </asp:GridView>
            <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
        </div>
    </form>
</body>
</html>

代码隐藏

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

namespace PortFolio
{
    public partial class Portfolio : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                GridView1.DataSource = new List<string>();
                GridView1.DataBind();
            }
        }

        protected void Button1_Click(object sender, EventArgs e)
        {

        }
    }
}

我在用 (!IsPostBack) 因为我不想总是在上面加载数据 Page_Load 因为我的gridview有一个复选框,如果我总是在页面加载时加载,它将丢失状态。我正在考虑使用viewstate,但我不知道如何使用。

奇怪的是,如果我在本地运行,gridview不会丢失,在发布到https之后,gridview会丢失。请帮忙