C＃中的RadioButton

在Windows窗体中，RadioButton控件用于在选项组中选择一个选项。例如，从给定列表中选择您的性别，因此您将仅在“男”或“女”或“跨性别”之类的三个选项中选择一个。在C＃中，RadioButton是一个类，并且在System.Windows.Forms命名空间下定义。在RadioButton中，允许您显示文本，图像或同时显示这两者，并且当您选择一个组中的一个单选按钮时，其他单选按钮会自动清除。您可以通过两种不同的方式创建RadioButton：

1.设计时：这是创建RadioButton控件的最简单方法，如以下步骤所示：

• 第1步：创建一个Windows窗体，如下图所示：
  Visual Studio->文件->新建->项目-> WindowsFormApp
  
• 步骤2：从工具箱中拖动RadioButton控件，并将其放在Windows窗体上。您可以根据需要将RadioButton控件放置在Windows窗体上的任何位置。
  
• 步骤3：拖放之后，您将转到RadioButton控件的属性，以根据您的要求修改RadioButton控件。
  

  输出：
  

2.运行时：比上述方法有些棘手。在此方法中，您可以在RadioButton类的帮助下以编程方式创建RadioButton。以下步骤显示了如何动态创建RadioButton：

• 步骤1：使用RadioButton类提供的RadioButton()构造函数创建单选按钮。

  // Creating radio button
  RadioButton r1 = new RadioButton();
  

• 步骤2：创建RadioButton后，设置RadioButton类提供的RadioButton的属性。

  // Set the AutoSize property 
  r1.AutoSize = true;
  
  // Add text in RadioButton
  r1.Text = "Intern";
  
  // Set the location of the RadioButton
  r1.Location = new Point(286, 40);
  
  // Set Font property 
  r1.Font = new Font("Berlin Sans FB", 12);
  

• 步骤3：最后使用Add()方法将此RadioButton控件添加到表单中。

  // Add this radio button to the form
  this.Controls.Add(r1);
  

  例子：

  using System;
  using System.Collections.Generic;
  using System.ComponentModel;
  using System.Data;
  using System.Drawing;
  using System.Linq;
  using System.Text;
  using System.Threading.Tasks;
  using System.Windows.Forms;
    
  namespace WindowsFormsApp24 {
    
  public partial class Form1 : Form {
    
      public Form1()
      {
          InitializeComponent();
      }
    
      private void RadioButton2_CheckedChanged(object sender,
                                                 EventArgs e)
      {
      }
    
      private void Form1_Load(object sender, EventArgs e)
      {
          // Creating and setting label
          Label l = new Label();
          l.AutoSize = true;
          l.Location = new Point(176, 40);
          l.Text = "Select Post:";
          l.Font = new Font("Berlin Sans FB", 12);
    
          // Adding this label to the form
          this.Controls.Add(l);
    
          // Creating and setting the 
          // properties of the RadioButton
          RadioButton r1 = new RadioButton();
          r1.AutoSize = true;
          r1.Text = "Intern";
          r1.Location = new Point(286, 40);
          r1.Font = new Font("Berlin Sans FB", 12);
    
          // Adding this label to the form
          this.Controls.Add(r1);
    
          // Creating and setting the 
          // properties of the RadioButton
          RadioButton r2 = new RadioButton();
          r2.AutoSize = true;
          r2.Text = "Team Leader";
          r2.Location = new Point(356, 40);
          r2.Font = new Font("Berlin Sans FB", 12);
          // Adding this label to the form
          this.Controls.Add(r2);
    
          // Creating and setting the 
          // properties of the RadioButton
          RadioButton r3 = new RadioButton();
          r3.AutoSize = true;
          r3.Text = "Software Engineer";
          r3.Location = new Point(480, 40);
          r3.Font = new Font("Berlin Sans FB", 12);
    
          // Adding this label to the form
          this.Controls.Add(r3);
      }
  }
  }
  

  输出：
  

重要属性

Property	Description
Appearance	This property is used to set a value determining the appearance of the RadioButton.
AutoCheck	This property is used to set a value indicating whether the Checked value and the appearance of the RadioButton control automatically change when the RadioButton control is clicked.
AutoSize	This property is used to set a value that indicates whether the RadioButton control resizes based on its contents.
BackColor	This property is used to set the background color of the RadioButton control.
CheckAlign	This property is used to set the location of the check box portion of the RadioButton.
Checked	This property is used to set a value indicating whether the RadioButton control is checked.
Font	This property is used to set the font of the text displayed by the RadioButton control.
ForeColor	This property is used to set the foreground color of the RadioButton control.
Location	This property is used to sets the coordinates of the upper-left corner of the RadioButton control relative to the upper-left corner of its form.
Name	This property is used to sets the name of the RadioButton control.
Padding	This property is used to sets padding within the RadioButton control.
Text	This property is used to set the text associated with this RadioButton control.
TextAlign	This property is used to set the alignment of the text on the RadioButton control.
Visible	This property is used to set a value indicating whether the RadioButton control and all its child controls are displayed.

重要事件

Event	Description
Click	This event occurs when the RadioButton control is clicked.
CheckedChanged	This event occurs when the value of the Checked property changes.
AppearanceChanged	This event occurs when the Appearance property value changes.
DoubleClick	This event occurs when the user double-clicks the RadioButton control.
Leave	This event occurs when the input focus leaves the RadioButton control.
MouseClick	This event occurs when the RadioButton control is clicked by the mouse.
MouseDoubleClick	This event occurs when the user double-clicks the RadioButton control with the mouse.
MouseHover	This event occurs when the mouse pointer rests on the RadioButton control.
MouseLeave	This event occurs when the mouse pointer leaves the RadioButton control.