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在尝试组合弹出窗口和一些跨页发布时，我遇到了可怕的异常“无法取消注册 ID 为‘UpdatePanel’的 UpdatePanel，因为它没有在 ScriptManager 中注册”。我已经能够用一个小例子重现这个问题。

我已经看到处理 UpdatePanel 的 Unload 事件的其他问题，但这似乎不适用于添加跨页面发布。

我该如何解决这个问题？

使用以下代码复制问题：

  1. 启动设置页面
  2. 按查看弹出链接
  3. 关闭弹出窗口
  4. 按下一步按钮转移到目标页面
  5. 按返回按钮转到设置页面
  6. 按查看链接并关闭弹出窗口
  7. 按下一步按钮，看看失败

以下是亮点（请原谅长度，但它应该是可剪切和粘贴的）：

安装程序.aspx

<head runat="server">
    <title>Setup </title>
    <script type="text/javascript">
        function openCenteredWindow(url, height, width, name, parms) {
            //Snip setting up window location stuff
            var win = window.open(url, name, winParms);
            return win;
        }
    </script>
</head>
<body>    
    <h1>Setup Page</h1>
    <form id="aspnetForm" runat="server">
    <div>
        <asp:TextBox ID="txtData" runat="server" Width="80%" Text="<%# Information %>" />
        <br />

        <asp:LinkButton ID="lbViewData" runat="server" 
        OnClientClick="aspnetForm.target='ViewDataPopup';" 
        Text="View In Popup" /> <br />

        <asp:Button ID="btnNext" runat="server" Text="Next" OnClick="btnNext_Click" />
    </div>
    <div>
        <br />
        <asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>
    <asp:updatepanel ID="UpdatePanel" runat="server" OnUnload="UpdatePanel_Unload"></asp:updatepanel>
    </div>
    </form>
</body>

安装程序.aspx.cs

public partial class Setup : System.Web.UI.Page
{
    protected override void LoadViewState(object savedState)
    {
        base.LoadViewState(savedState);
        if (this.ViewState["Information"] != null)
            _Information = this.ViewState["Information"].ToString();
    }

    protected override object SaveViewState()
    {
        this.ViewState["Information"] = _Information;
        return base.SaveViewState();
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        if (PreviousPage != null && PreviousPage is TargetPage)
        {
            _Information = ((TargetPage)PreviousPage).SetupData;
        }
        else if (!Page.IsPostBack)
        {
            _Information = String.Format("This test started at {0}", DateTime.Now);
        }
        Page.DataBind();
        lbViewData.PostBackUrl = "ViewData.aspx?u=0";
        lbViewData.Attributes.Add("onclick", "JavaScript:openCenteredWindow(\"ViewData.aspx?u=0\", 400, 300, \"ViewDataPopup\", 'scrollbars=yes');");
    }

    private string _Information;
    public string Information
    {
        get { return _Information; }
    }

    protected void btnNext_Click(object sender, EventArgs e)
    {
        HttpContext.Current.Server.Transfer("~/TargetPage.aspx");
    }
}

视图数据.aspx

<%@ PreviousPageType VirtualPath="~/Setup.aspx" %> 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head runat="server">
    <title>View Data</title>
       <script type="text/javascript">
           function fixForm() {
               opener.document.getElementById("aspnetForm").target = "";
               opener.document.getElementById("aspnetForm").action = "";               
           }
    </script>
</head>
<body onload="fixForm()">
    <form id="aspnetForm" runat="server">
    <div>
        <h2 >View Data</h2>
    </div>
    <asp:Label ID="lblData" runat="server" Text="<%# SetupData %>" />
    </form>
</body>

ViewData.aspx.cs

protected void Page_Load(object sender, EventArgs e)
{
    if (PreviousPage != null)
    {
        Setup setup = (Setup)PreviousPage;
        this.SetupData = setup.Information ?? "Data not set in Setup Page";
    }
    Page.DataBind();
}

private string _setupData = "Did not get updated data";
protected string SetupData
{
    get { return _setupData; }
    set { _setupData = value; }
}

目标页面.aspx

<%@ PreviousPageType VirtualPath="~/Setup.aspx" %>
<body style="background-color: #9999BB">
    <h1>Target Page</h1>
    <form id="aspnetForm" runat="server">
    <div>
        <asp:Label ID="lblData" runat="server" Text="<%# SetupData %>" /><br />
        <asp:Button ID="btnBack" runat="server" Text="Back" OnClick="btnBack_Click" />
    </div>
    </form>
</body>

TargetPage.aspx.cs

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            if (this.PreviousPage == null)
                Response.Redirect("Setup.aspx");

            this.SetupData = PreviousPage.Information;
        }
        Page.DataBind();
    }

    public string SetupData
    {
        get { return ViewState["SetupData"].ToString(); }
        set { ViewState["SetupData"] = value; }
    }

    protected void btnBack_Click(object sender, EventArgs e)
    {
        HttpContext.Current.Server.Transfer("~/Setup.aspx");
    }

正如您所看到的，让 UpdatePanel 仅仅停留在页面上并且什么都不做就足以让这个错误发生。

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