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我有以下经过测试的代码，它运行良好：

Default2.aspx.cs

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

public partial class Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

        for (int i = 1; i < 5; i++)
        {
            var temp = i;
            DataTable table = GetTable();
            HttpContext.Current.Session[i.ToString()] = table;
            GridView gv = new GridView();
            gv.ID = "GridView-" + i.ToString();
            gv.DataSource = HttpContext.Current.Session[i.ToString()];
            gv.DataBind();

            Button btn = new Button();
            btn.ID = "button-" + i.ToString();
            btn.Click += (senders, es) => CreateModalPop(temp,PlaceHolder1, btn.ID);

            PlaceHolder1.Controls.Add(gv);
            PlaceHolder1.Controls.Add(btn);


        }
    }


    static DataTable GetTable()
    {
        //
        // Here we create a DataTable with four columns.
        //
        DataTable table = new DataTable();
        table.Columns.Add("Dosage", typeof(int));
        table.Columns.Add("Drug", typeof(string));
        table.Columns.Add("Patient", typeof(string));
        table.Columns.Add("Date", typeof(DateTime));

        //
        // Here we add five DataRows.
        //
        table.Rows.Add(25, "Indocin", "David", DateTime.Now);
        table.Rows.Add(50, "Enebrel", "Sam", DateTime.Now);
        table.Rows.Add(10, "Hydralazine", "Christoff", DateTime.Now);
        table.Rows.Add(21, "Combivent", "Janet", DateTime.Now);
        table.Rows.Add(100, "Dilantin", "Melanie", DateTime.Now);
        return table;
    }


    protected void CreateModalPop(int num, PlaceHolder ph, string btnID)
    {

        GridView gv = new GridView();
        gv.ID = "GridViewNew-" + num.ToString();
        gv.AutoGenerateColumns = true;
        gv.DataSource = HttpContext.Current.Session[num.ToString()];
        gv.DataBind();

        Panel pn = new Panel();
        pn.ID = "Panel-" + num.ToString();
        pn.CssClass = "modalPopup";
        pn.Controls.Add(gv);



        AjaxControlToolkit.ModalPopupExtender modalPop = new AjaxControlToolkit.ModalPopupExtender();
        modalPop.ID = "ModalPopup-1";
        modalPop.PopupControlID = pn.ID;
        modalPop.TargetControlID = btnID;
        modalPop.BackgroundCssClass = "modalBackground";

        // Adding modalpop to panel
        pn.Controls.Add(modalPop);

        // Adding Panel to placeholder
        ph.Controls.Add(pn);

        modalPop.Show();

 }
}

默认2.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <style type="text/css">
        .modalBackground { background-color: Gray; filter: alpha(opacity=70); opacity: 0.7; cursor:not-allowed; position: absolute; top: 0%; left: 0%; width: 100%; height: 140%; overflow:hidden;}

        .modalPopup { background-color: #ffffdd; border-width: 3px; border-style: solid; border-color: Gray; padding: 3px; width: 350px; }

    </style>
</head>
<body>
    <form id="form1" runat="server">
        <ajaxToolkit:ToolkitScriptManager CombineScripts="false" ScriptMode="Release" ID="ToolkitScriptManager1" runat="server"></ajaxToolkit:ToolkitScriptManager>
    <div>
        <asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>

    </div>
    </form>
</body>
</html>

现在我拿了这段代码并试图把它放在一个类中并使用这个类。这样做之后，表格首先在页面加载时加载，但是当您单击其中一个按钮时，它只会将您带到一个空白页面。为什么这样做？或者我该如何解决？

默认3.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default3.aspx.cs" Inherits="Default3" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <style type="text/css">
        .modalBackground { background-color: Gray; filter: alpha(opacity=70); opacity: 0.7; cursor:not-allowed; position: absolute; top: 0%; left: 0%; width: 100%; height: 140%; overflow:hidden;}
        .modalPopup { background-color: #ffffdd; border-width: 3px; border-style: solid; border-color: Gray; padding: 3px; width: 350px; }
    </style>
</head>
<body>
    <form id="form1" runat="server">
         <ajaxToolkit:ToolkitScriptManager CombineScripts="false" ScriptMode="Release" ID="ToolkitScriptManager1" runat="server"></ajaxToolkit:ToolkitScriptManager>
    <div>
        <asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
    </div>
    </form>
</body>
</html>

Default3.aspx.cs

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

public partial class Default3 : System.Web.UI.Page
{
    // Global Object initializer
    Class1 inv = new Class1();

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            inv.SetInitialRow(PlaceHolder1);
        }

    }


}

Class1.cs

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

/// <summary>
/// Summary description for Class1
/// </summary>
public class Class1
{
    public Class1()
    {
        //
        // TODO: Add constructor logic here
        //
    }

    public void SetInitialRow(PlaceHolder ph)
    {
        for (int i = 1; i < 5; i++)
        {
            var temp = i;
            DataTable table = GetTable();
            HttpContext.Current.Session[i.ToString()] = table;
            GridView gv = new GridView();
            gv.ID = "GridView-" + i.ToString();
            gv.DataSource = HttpContext.Current.Session[i.ToString()];
            gv.DataBind();

            Button btn = new Button();
            btn.ID = "button-" + i.ToString();
            btn.Click += (senders, es) => CreateModalPop(temp, ph, btn.ID);

            ph.Controls.Add(gv);
            ph.Controls.Add(btn);


        }
    }


    static DataTable GetTable()
    {
        //
        // Here we create a DataTable with four columns.
        //
        DataTable table = new DataTable();
        table.Columns.Add("Dosage", typeof(int));
        table.Columns.Add("Drug", typeof(string));
        table.Columns.Add("Patient", typeof(string));
        table.Columns.Add("Date", typeof(DateTime));

        //
        // Here we add five DataRows.
        //
        table.Rows.Add(25, "Indocin", "David", DateTime.Now);
        table.Rows.Add(50, "Enebrel", "Sam", DateTime.Now);
        table.Rows.Add(10, "Hydralazine", "Christoff", DateTime.Now);
        table.Rows.Add(21, "Combivent", "Janet", DateTime.Now);
        table.Rows.Add(100, "Dilantin", "Melanie", DateTime.Now);
        return table;
    }

    protected void CreateModalPop(int num, PlaceHolder ph, string btnID)
    {

        GridView gv = new GridView();
        gv.ID = "GridViewNew-" + num.ToString();
        gv.AutoGenerateColumns = true;
        gv.DataSource = HttpContext.Current.Session[num.ToString()];
        gv.DataBind();

        Panel pn = new Panel();
        pn.ID = "Panel-" + num.ToString();
        pn.CssClass = "modalPopup";
        pn.Controls.Add(gv);


        AjaxControlToolkit.ModalPopupExtender modalPop = new AjaxControlToolkit.ModalPopupExtender();
        modalPop.ID = "ModalPopup-1";
        modalPop.PopupControlID = pn.ID;
        modalPop.TargetControlID = btnID;
        modalPop.BackgroundCssClass = "modalBackground";

        // Adding modalpop to panel
        pn.Controls.Add(modalPop);

        // Adding Panel to placeholder
        ph.Controls.Add(pn);
        modalPop.Show();

    }
}
4

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