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CheckBox和控件Foreach循环

2024-08-08 11:11:38   219人阅读

.aspx代码如下：

<%@ 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=http://www.mamicode.com/"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"  />   
        &nbsp;   
        <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" onclick="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示例" 
            onclick="Button1_Click" />
    </div>
    
    </div>
    </form>
</body>
</html>

.aspx.cs代码如下：

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 ：？的用法
        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；所以要引入另一个变量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);

        }

        
    }
}


CheckBox和控件Foreach循环


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