前端代码：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
???<title></title>
</head>
<body>
???<form id="form1" runat="server">
???<div id="div_chk"
???style = "width:1000px;border:3px outset #dd9900;margin:54px auto 0 auto;backgroup:red"
???runat="server">
???你学过的课程有：<br/>
???????<asp:CheckBox ID="C1" Text = "数据库原理" Width = "260px" runat="server" />
???????<asp:CheckBox ID="C3" Text = "操作系统" Width = "260px" runat="server" />
???????<asp:CheckBox ID="C5" Text = "c语言" Width = "260px" runat="server" />
???????<asp:CheckBox ID="C6" Text = "计算机网络" Width = "260px" runat="server" />
???????<asp:CheckBox ID="C7" Text = "管理学" Width = "260px" runat="server" />
???????<asp:CheckBox ID="C8" Text = "电子商务" Width = "260px" runat="server" />
???????<asp:CheckBox ID="C9" Text = "计算机基础" Width = "260px" runat="server" />
???????<br/>
???????<asp:Button ID="Button1" runat="server" Text="确定" onclick="Button1_Click" />
???????<br/>
???????<asp:TextBox ID="TextBox1" ?TextMode ="Multiline" Rows = "6" runat="server"></asp:TextBox>
????????<br/>
???<br/>
???<asp:TextBox ID="TextBox2" TextMode ="Multiline" Rows = "6" runat="server"></asp:TextBox>
???????<asp:Button ID="Button2" runat="server" Text="确定" ?onclick="Button2_Click" />
???<br/>
???<br/>
???<div id = "div_sun" runat = "server">
???<asp:Button ID="Button3" runat="server" Text="Button" />
???<asp:Button ID="Button4" runat="server" Text="Button" />
???<asp:Button ID="Button5" runat="server" Text="Button" />
???<asp:Button ID="Button6" runat="server" Text="Button" />
???<asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
???<asp:TextBox ID="TextBox4" runat="server"></asp:TextBox>
</div>
?<asp:Button ID="Button7" runat="server" Text="显示控件个数" onclick="Button7_Click" />
???</div>
???</form>
</body>
</html>
后端代码：
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) ???{ ???} ???protected void Button1_Click(object sender, EventArgs e) ???{ ???????TextBox1.Text = ""; ???????CheckBox ?chk; ???????foreach(Control _ctl in div_chk.Controls){ ???????????if(_ctl is CheckBox){ ???????????chk = (CheckBox)_ctl; ???????????????if(chk.Checked == true){ ???????????????TextBox1.Text +=chk.Text+","; ???????????????} ???????????} ???????} ?????} ???protected void Button2_Click(object sender, EventArgs e) ???{ ???????char[] str1 = "abcdefg!".ToCharArray(); ???????foreach (char ch in str1) ???????{ ???????????TextBox2.Text += ch.ToString() + Convert.ToChar(13); ???????} ???} ???protected void Button7_Click(object sender, EventArgs e) ???{ ????????????Button bu; ???????TextBox te; ???????int i=0; ???????int j=0; ???????foreach (Control bt in div_sun.Controls) ???????{ ???????????if (bt is Button) { ???????????????i++; ???????????} ???????????if (bt is TextBox) { ???????????????j++; ???????????} ???????} ???????Response.Write("按钮控件"+i.ToString() + "个" + "</br>"); ???????Response.Write("文本框控件" + j.ToString() + "个" + "</br>"); ???}}
web网页【2】
原文地址：https://www.cnblogs.com/sunyubin/p/9636147.html