使用了timer 和UpdatePanel结果总是整个页面刷新

<asp:UpdatePanel ID=”UpdatePanel” runat=”server” UpdateMode=”Conditional”>
<ContentTemplate>
<asp:Timer ID=”Timer1″ runat=”server” Interval=”1000″ OnTick=”Timer1_Tick”></asp:Timer>
<asp:Label ID=”Label1″ runat=”server” Text=”Label”></asp:Label>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID=”Timer1″ EventName=”Tick” />
</Triggers>
</asp:UpdatePanel>
protected void Page_Load(object sender, EventArgs e)
{
Label1.Text = DateTime.Now.ToString(“yyyy/MM/dd HH:mm:ss”);
}
protected void Timer1_Tick(object sender, EventArgs e)
{
Label1.Text = DateTime.Now.ToString(“yyyy/MM/dd HH:mm:ss”);
}

解决方案

你可以测试（例如）这样的代码

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
        <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
        <asp:UpdatePanel ID="UpdatePanel" runat="server" UpdateMode="Conditional">
            <ContentTemplate>
                <asp:Timer ID="Timer1" runat="server" Interval="1000" OnTick="Timer1_Tick"></asp:Timer>
                <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
            </ContentTemplate>
        </asp:UpdatePanel>
    <asp:Label ID="Label2" runat="server" Text="Label"></asp:Label>
    </form>
    <asp:Label ID="Label3" runat="server" Text="Label"></asp:Label>
</body>
</html>

using System;
public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Label1.Text = DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss");
        Label2.Text = DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss");
        Label3.Text = DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss");
    }
    protected void Timer1_Tick(object sender, EventArgs e)
    {
        Label1.Text = DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss");
    }
}