asp.net 4.5演習〜test6-1

webform1.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="test6_1.WebForm1" %>

<!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">
    <div>
        <strong>请选择你的爱好？</strong><br />
        <select id="Interest" runat="server">
        </select>
        <p>向列表中添加爱好</p>
        <input id="Text1" type="text" runat="server" />
        <input id="Button1" type="button" value="添加"  runat="server" onserverclick="Button1_ServerClick"/>
    </div>
    </form>
</body>
</html>

webform1.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace test6_1
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            Interest.Items.Add("Page_load");
            //解决办法就是使用IsPostBack
            if (!IsPostBack)
            {
                Interest.Items.Add("PostBack");
            }
        }
        //Page_Init只执行一遍
        protected void Page_Init(object sender, EventArgs e)
        {
            Interest.Items.Add("宅男");
            Interest.Items.Add("健身");
            Interest.Items.Add("打电动");
            Interest.Items.Add("看动漫");
        }

        protected void Button1_ServerClick(object sender, EventArgs e)
        {
            if (Text1.Value == string.Empty)
            {
                return;
            }
            Interest.Items.Add(Text1.Value);
        }
    }
}

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