ASP.NET AJAX：在多个UpdatePanle中使用Timer控件 (2)
9．设置第二个Label控件的Text属性值为“UpdatePanel2 not refreshed yet”。
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11．双击Timer控件添加Tick事件处理，在事件处理中设置Label1和Label2的Text属性值，代码如下。．在UpdatePanel1和UpdatePanel2中添加Timer控件作为AsyncPostBackTrigger，代码如下：
public partial class _Default : System.Web.UI.Page{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Timer1_Tick(object sender, EventArgs e)
{
Label1.Text = "UpdatePanel1 refreshed at: " +
DateTime.Now.ToLongTimeString();
Label2.Text = "UpdatePanel2 refreshed at: " +
DateTime.Now.ToLongTimeString();
}
}
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<Triggers> <asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" /></Triggers>全部完成后ASPX页面代码如下：
．保存并按Ctrl + F5运行。
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<div>
<asp:Timer ID="Timer1" OnTick="Timer1_Tick" runat="server" Interval="10000">
</asp:Timer>
</div>
<asp:UpdatePanel ID="UpdatePanel1" UpdateMode="Conditional" runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
</Triggers>
<ContentTemplate>
<asp:Label ID="Label1" runat="server" Text="UpdatePanel1 not refreshed yet."></asp:Label>
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdatePanel ID="UpdatePanel2" UpdateMode="Conditional" runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
</Triggers>
<ContentTemplate>
<asp:Label ID="Label2" runat="server" Text="UpdatePanel2 not refreshed yet."></asp:Label>
</ContentTemplate>
</asp:UpdatePanel>
</form>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head id="Head1" runat="server"> <title>Untitled Page</title></head><body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server" /> <div> <asp:Timer ID="Timer1" OnTick="Timer1_Tick" runat="server" Interval="10000"> </asp:Timer> </div> <asp:UpdatePanel ID="UpdatePanel1" UpdateMode="Conditional" runat="server"> <Triggers> <asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" /> </Triggers> <ContentTemplate> <asp:Label ID="Label1" runat="server" Text="UpdatePanel1 not refreshed yet."></asp:Label> </ContentTemplate> </asp:UpdatePanel> <asp:UpdatePanel ID="UpdatePanel2" UpdateMode="Conditional" runat="server"> <Triggers> <asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" /> </Triggers> <ContentTemplate> <asp:Label ID="Label2" runat="server" Text="UpdatePanel2 not refreshed yet."></asp:Label> </ContentTemplate> </asp:UpdatePanel> </form></body></html>
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14．等待10秒钟后两个UpdatePanel都刷新后，Label中的文本都变成了当前时间。
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