UpdatePanel 不执行部分页面更新，并且 IsInAsyncPostBack 始终为 false

发布于 2024-08-20 16:35:18 字数 1653 浏览 7 评论 0原文

我正在尝试使用 UpdatePanel，但无法使部分页面更新生效。

当我查看 ScriptManager 的 IsInAsyncPostBack 属性时，它始终为 false。

这是重现该问题的页面。它有一个 ScriptManager、一个 UpdatePanel、更新面板中的 LinkButton 以及通过 Triggers 集合连接到 UpdatePanel 的 Button。

<%@ Page Language="C#" %>
<script runat="server">
    protected void Page_Load(object sender, EventArgs e)
    {

        Label1.Text = DateTime.Now.ToString();

        if (IsPostBack)
            Label1.Text += " - Postback!";
        if (ScriptManager1.IsInAsyncPostBack)
            Label1.Text += " - Async!";
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<body>
    <form id="form1" runat="server">
            <asp:ScriptManager ID="ScriptManager1" EnablePartialRendering="true" runat="server"  />

            <asp:UpdatePanel ID="UpdatePanel1" UpdateMode="Conditional" runat="server">
                <ContentTemplate>Panel 1:<asp:Label runat=server ID=Label1 /><br />
                <asp:LinkButton runat=server ID="LinkButton1" Text="Update!"></asp:LinkButton></ContentTemplate>
                <Triggers><asp:AsyncPostBackTrigger ControlID="Button1" EventName="Click" /></Triggers>
            </asp:UpdatePanel>
            <asp:Button ID="Button1" Text="Refresh Panel 1" runat="server" UseSubmitBehavior=false />

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

如果我运行此代码并单击任一按钮，我会看到“Panel 1:2/8/2010 3:38:41 PM - Postback!”

我预计单击任一按钮都会导致 UpdatePanel1 的部分页面更新，IsInAsyncPostBack 将为 true，并且“-异步！”将被附加到 Label1。

知道为什么 IsInAsyncPostBack 总是 false 吗？

原文

I'm attempting to use an UpdatePanel, but can't get partial-page updates to work.

When I look at the ScriptManager's IsInAsyncPostBack property, it's always false.

Here's a page that reproduces the issue. It has a ScriptManager, an UpdatePanel, a LinkButton within the update panel, and a Button wired up to the UpdatePanel via the Triggers collection.

<%@ Page Language="C#" %>
<script runat="server">
    protected void Page_Load(object sender, EventArgs e)
    {

        Label1.Text = DateTime.Now.ToString();

        if (IsPostBack)
            Label1.Text += " - Postback!";
        if (ScriptManager1.IsInAsyncPostBack)
            Label1.Text += " - Async!";
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<body>
    <form id="form1" runat="server">
            <asp:ScriptManager ID="ScriptManager1" EnablePartialRendering="true" runat="server"  />

            <asp:UpdatePanel ID="UpdatePanel1" UpdateMode="Conditional" runat="server">
                <ContentTemplate>Panel 1:<asp:Label runat=server ID=Label1 /><br />
                <asp:LinkButton runat=server ID="LinkButton1" Text="Update!"></asp:LinkButton></ContentTemplate>
                <Triggers><asp:AsyncPostBackTrigger ControlID="Button1" EventName="Click" /></Triggers>
            </asp:UpdatePanel>
            <asp:Button ID="Button1" Text="Refresh Panel 1" runat="server" UseSubmitBehavior=false />

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

If I run this code and click on either of the buttons, I see "Panel 1:2/8/2010 3:38:41 PM - Postback!"

I expected that clicking either button would cause a partial-page update for UpdatePanel1, that IsInAsyncPostBack would be true, and that " - Async!" would be appended to Label1.

Any idea why IsInAsyncPostBack is always false?

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