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The author:(作者)qqpublished in(发表于) 2014/7/11 9:15:57 C#中CheckBox控件应用实例
C#中CheckBox控件应用实例
CheckBox控件1．功能CheckBox控件指定某个特定条件是处于打开状态还是处于关闭状态，它常用于为用户提供“是/否”或“真/假”选项。图1为CheckBox控件。图1 CheckBox控件2．属性CheckBox控件常用属性及说明如表1所示。表1 CheckBox控件常用属性及说明下面详细介绍Checked属性，该属性用于指定复选框是否处于选中状态。语法：public bool Checked { get; set; }属性值：如果CheckBox处于选定状态，则为True；否则为False。默认值为False。注意：如果将ThreeState属性设置为True，则Checked属性将为Checked或Indeterminate CheckState返回True。示例使用Checked属性判断复选框是否选中本示例使用Checked属性判断复选框是否选中，并给出提示信息。示例运行结果如图2所示。图2 使用Checked属性判断复选框是否选中程序主要代码如下：if (this.checkBox1.Checked == False && this.checkBox2.Checked ==False && checkBox3.Checked == False){MessageBox.Show("至少选一项爱好");return;}if (radioButton1.Checked == False && radioButton2.Checked == False){MessageBox.Show("请选择性别");return;}完整程序代码如下：★★★★★主程序文件完整程序代码★★★★★using System;using System.Collections.Generic;using System.Windows.Forms;namespace _8_10{static class Program{/// /// 应用程序的主入口点。/// [STAThread]static void Main(){Application.EnableVisualStyles();Application.SetCompatibleTextRenderingDefault(false);Application.Run(new frmCheckBox());}}}★★★★★frmCheckBox窗体设计文件完整程序代码★★★★★using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;namespace _8_10{public partial class frmCheckBox : Form{public frmCheckBox(){InitializeComponent();}private void button1_Click(object sender, EventArgs e){if (this.checkBox1.Checked == false && this.checkBox2.Checked ==false && checkBox3.Checked == false){MessageBox.Show("至少选一项爱好");return;}if (radioButton1.Checked == false && radioButton2.Checked == false){MessageBox.Show("请选择性别");return;}}private void button2_Click(object sender, EventArgs e){Application.Exit();}private void checkBox1_CheckedChanged(object sender, EventArgs e){}private void checkBox2_CheckedChanged(object sender, EventArgs e){}private void checkBox3_CheckedChanged(object sender, EventArgs e){}private void button3_Click(object sender, EventArgs e){}private void button4_Click(object sender, EventArgs e){}private void checkedListBox1_Click(object sender, EventArgs e){}private void frmCheckBox_Load(object sender, EventArgs e){}}}★★★★★frmCheckBox窗体代码文件完整程序代码★★★★★namespace _8_10{partial class frmCheckBox{/// /// 必需的设计器变量。/// private System.ComponentModel.IContainer components = null;/// /// 清理所有正在使用的资源。/// /// 如果应释放托管资源，为 true；否则为 false。protected override void Dispose(bool disposing){if (disposing && (components != null)){components.Dispose();}base.Dispose(disposing);
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