.aspx代码例如以下：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Sample 3-06.aspx.cs" Inherits="Sample_3_6" %> <!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> <link href="StyleSheet.css" rel="stylesheet" type="text/css" /> </head> <body> <form id="form1" runat="server"> <div id="mydiv"> <h2>CheckBox应用</h2> <%--程序1--%> <div> <asp:CheckBox ID="CheckBox1" runat="server" Text ="我是AutoPostBack" AutoPostBack="true" oncheckedchanged="CheckBox1_CheckedChanged" /> <asp:TextBox ID="txt_1" runat="server"></asp:TextBox> </div> <hr /> <%--程序2--%> <div id="div_chklist" runat="server" > <p>请选择你的爱好：</p> <asp:CheckBox ID="CheckBox2" runat="server" Text ="逛街" Width="100px" /> <asp:CheckBox ID="CheckBox3" runat="server" Text ="喝茶" Width="100px" /> <asp:CheckBox ID="CheckBox4" runat="server" Text ="唱歌" Width="100px" /> <asp:CheckBox ID="CheckBox5" runat="server" Text ="购物" Width="100px" /> <asp:CheckBox ID="CheckBox6" runat="server" Text ="看电影" Width="100px" /> <asp:CheckBox ID="CheckBox7" runat="server" Text ="看书" Width="100px" /> <asp:CheckBox ID="CheckBox8" runat="server" Text ="旅游" Width="100px" /> <asp:CheckBox ID="CheckBox9" runat="server" Text ="听音乐" Width="100px" /> <asp:CheckBox ID="CheckBox10" runat="server" Text ="爬山" Width="100px" /> <asp:CheckBox ID="CheckBox11" runat="server" Text ="玩游戏" Width="100px" /> <asp:CheckBox ID="CheckBox12" runat="server" Text ="看综艺节目" Width="100px" /> <asp:CheckBox ID="CheckBox13" runat="server" Text ="学ASP.NET" Width="100px" /> <br /><br /> <asp:Button ID="btn_submit" runat="server" Text="提交" Height="29px" Width="78px" οnclick="btn_submit_Click" /> <br /><br /> 您选择的是：<asp:TextBox ID="TextBox1" runat="server" Height="56px" Width="310px" TextMode="MultiLine"></asp:TextBox> </div> <hr /> <div style="text-align:center; padding:10px; "> <asp:Button ID="Button1" runat="server" Text="foreach循环语句应用于数组代码演示样例" οnclick="Button1_Click" /> </div> </div> </form> </body> </html>
.aspx.cs代码例如以下：
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; public partial class Sample_3_6 : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void CheckBox1_CheckedChanged(object sender, EventArgs e) { //C#中的3元运算符 ：？的使用方法 txt_1.Text = (CheckBox1.Checked) ? "选中状态" : "非选中状态"; } protected void btn_submit_Click(object sender, EventArgs e) { //首先要清空TEXTBOX的内容；以免受上一次操作的影响 TextBox1.Text = ""; CheckBox chk; //foreach语句 ctl是循环的自变量不可被更改；所以要引入还有一个变量chk（控件类型） foreach (Control ctl in div_chklist.Controls) { if (ctl is CheckBox) { chk = (CheckBox)ctl; if (chk.Checked) { TextBox1.Text += chk.Text + ","; } } } } protected void Button1_Click(object sender, EventArgs e) { TextBox1.Text = ""; char[] cA = "ABCDEFGHIJKLMNOPQRSTUVWXYZ".ToCharArray(); foreach (char _ca in cA) { TextBox1.Text += _ca.ToString() + Convert.ToChar(13); } } }转载于:https://www.cnblogs.com/bhlsheji/p/4342835.html
