asp.net代码练习 work018 panel和placeholder的使用-白红宇的个人博客

asp.net代码练习 work018 panel和placeholder的使用

发布日期：2021-05-06 21:17:45 浏览次数：14 分类：原创文章

本文共 2427 字，大约阅读时间需要 8 分钟。

webform1.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="work018.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>Panel和PlaceHolder</title></head><body>    <form id="form1" runat="server">    <div>        <div>            <h4>Panel</h4>            性别：<asp:RadioButton ID="RadioButton1" runat="server" AutoPostBack="true" Text="男" OnCheckedChanged="RadioButton1_CheckedChanged" GroupName="sex" />            <asp:RadioButton ID="RadioButton2" runat="server" AutoPostBack="true" Text="女" OnCheckedChanged="RadioButton2_CheckedChanged" GroupName="sex" />            <asp:Panel ID="Panel1" runat="server">                妻子姓名：<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>            </asp:Panel>            <asp:Panel ID="Panel2" runat="server">                丈夫姓名：<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>            </asp:Panel>        </div>        <div>            <h4>PlaceHolder</h4>            <asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>        </div>    </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 work018{    public partial class WebForm1 : System.Web.UI.Page    {        protected void Page_Load(object sender, EventArgs e)        {            //panel            if (!IsPostBack)            {                 Panel1.Visible = false;                Panel2.Visible = false;            }            //placeholder            Button btn1 = new Button();            btn1.Text = "动态添加控件";            btn1.Click += btn1_Click;            PlaceHolder1.Controls.Add(btn1);        }        void btn1_Click(object sender, EventArgs e)        {            Literal lit = new Literal();            lit.Text = "PlaceHolder1控件总共容纳了" + PlaceHolder1.Controls.Count + "个控件<br>";            PlaceHolder1.Controls.Add(lit);        }        protected void RadioButton1_CheckedChanged(object sender, EventArgs e)        {            Panel1.Visible = true;            Panel2.Visible = false;        }        protected void RadioButton2_CheckedChanged(object sender, EventArgs e)        {            Panel1.Visible = false;            Panel2.Visible = !Panel1.Visible;        }    }}

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