ASP.NET AJAX

时间： 2023-08-28 admin IT培训

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ASP.NET AJAX

①.aspx文件

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" ".dtd"><html xmlns="">
<head id="Head1" runat="server"><title></title>
</head>
<body><form id="form1" runat="server"><div><asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager><asp:UpdatePanel ID="UpdatePanel1" runat="server" ChildrenAsTriggers="False" UpdateMode="Conditional"><ContentTemplate><asp:Label ID="Label1" runat="server" Text="Label"></asp:Label><asp:Button ID="Button1" runat="server" Text="按钮1" οnclick="Button1_Click" /><asp:Button ID="Button2" runat="server" Text="按钮2" οnclick="Button2_Click" /><br /><asp:UpdateProgress ID="UpdateProgress1" runat="server"><ProgressTemplate><asp:Image ID="Image1" runat="server" Height="538px" ImageUrl="~/images/CF7FDA912DE906E6E3719A15E1D99102.gif" Width="553px" /></ProgressTemplate></asp:UpdateProgress></ContentTemplate><Triggers><asp:AsyncPostBackTrigger ControlID="Button1" EventName="Click" /><asp:AsyncPostBackTrigger ControlID="Button2" EventName="Click" /></Triggers></asp:UpdatePanel>        </div></form>
</body>
</html>

②.aspx.cs文件(后台)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;public partial class _Default : System.Web.UI.Page
{protected void Page_Load(object sender, EventArgs e){if (!IsPostBack){Label1.Text = "页面加载时间：" + DateTime.Now.ToString();}}protected void Button1_Click(object sender, EventArgs e){Label1.Text = "页面加载时间：" + DateTime.Now.ToString();}protected void Button2_Click(object sender, EventArgs e){System.Threading.Thread.Sleep(3000);//睡眠3秒（显示图片三秒）}}

③效果图如图：

④说明：
Ⅰ.点击按钮1，只更新时间不刷新页面。
Ⅱ.点击按钮2，图片显示3秒。