CheckBox和控件Foreach循环

时间：2021-08-14 14:44:24

CheckBox和控件Foreach循环CheckBox和控件Foreach循环CheckBox和控件Foreach循环CheckBox和控件Foreach循环

.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"  />   

        &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演示样例" 

            onclick="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);

        }

    }

}

CheckBox和控件Foreach循环

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