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C# 中的复选框

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2024-09-03 15:27:36889浏览

CheckBox 是一个允许用户从选项列表中进行单个或多个选择的控件。在 C# 中,System.Windows.Forms 命名空间中的 CheckBox 类用于处理复选框控件。它是 Windows 窗体的一部分,用于获取用户的输入。它还可用于从 true/false 或 yes/no 等选项中进行选择。

用户可以单击复选框来选择关联的项目,并可以再次单击它来取消选择该项目。它可以与图像或文本或两者一起使用。

复选框的类型

我们可以通过两种不同的方式创建复选框:

  1. 在设计时使用表单设计器。
  2. 在运行时在代码中使用 CheckBox 类。

我们可以在设计时创建复选框,方法是从工具箱中拖动复选框控件,然后将其放在 Windows 窗体上。然后,我们就可以进入复选框控件的属性并进行修改。

要在运行时创建复选框,我们需要使用 CheckBox 类。

语法:

CheckBox check_box = new CheckBox();

之后,我们就可以根据自己的需求设置复选框的属性了。

//setting location of checkbox
check_box.Location = new Point(300,150);
//setting height and width for checkbox
check_box.Height = 50;
check_box.Width = 50;
//setting text for checkbox
check_box.Text = “Yes”;

最后,我们需要使用以下方法将此复选框添加到 Windows 窗体:

this.Controls.Add(check_box);

复选框属性

C# 为复选框提供了许多属性。

Property Description
AllowDrop It is used to get or set a value that determines whether the checkbox control can accept data that a user drags onto it.
Appearance It is used to get or set a value that determines the appearance of the checkbox control.
AutoCheck It is used to get or set a value that determines whether the values of the Checked or CheckState properties or the appearance of the checkbox are automatically changed when the checkbox is clicked.
AutoSize It is used to get or set a value that determines whether the checkbox control resizes based on its content.
BackColor It is used to get or set the background color of the checkbox control.
BackGroundImage It is used to get or set the background image displayed in the checkbox control.
CanFocus It is used to get a value that determines whether the checkbox control can receive focus.
Checked It is used to get or set a value that determines whether the checkbox control is in the checked state.
CheckState It is used to get or set the state of the checkbox.
DefaultSize It is used to get the default size of the checkbox control.
Enabled It is used to get or set a value that determines whether the checkbox control can respond to user interaction.
Focused It is used to get a value that determines whether the checkbox control has input focus.
Font It is used to get or set the font of text displayed by the checkbox control.
ForeColor It is used to get or set the foreground color of the checkbox control.
Height It is used to get or set the height of the checkbox control.
Image It is used to get or set the image which is displayed on the checkbox control.
Location It is used to get or set the coordinates of the upper left corner of the control relative to the upper left corner of its parent container.
Margin It is used to get or set the space between controls.
Name It is used to get or set the name of the checkbox control.
Size It is used to get or set the height and width of the checkbox control.
Text It is used to get or set the text associated with the checkbox control.
ThreeState It is used to get or set a value that determines whether the checkbox will allow three check states instead of two.
Width It is used to get or set the width of the checkbox control.

CheckBox Events

Let us see some important events for the CheckBox provided by C#:

Event Description
CheckedChanged This event occurs when the value of Checked property changes.
CheckStateChanged This event occurs when the value of CheckState property changes.
Click This event occurs when the checkbox is clicked.
GotFocus This event occurs when the checkbox receives focus.
Leave This event occurs when the input focus leaves the checkbox.
LostFocus This event occurs when the checkbox loses focus.
MouseClick This event occurs when the checkbox is clicked by the mouse.
MouseDoubleClick This event occurs when the checkbox is double-clicked by a mouse.
TextChanged This event occurs when the value of Text property changes.

Implementation of CheckBox in C#

Below is an example of how to implement the checkbox in c #

Example:

Code:

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 WindowsFormsApp1
{
public partial class CheckBoxDemo : Form
{
public CheckBoxDemo()
{
InitializeComponent();
}
private void CheckBoxDemo_Load(object sender, EventArgs e)
{
//Creating and setting properties of Label
Label label = new Label();
label.Text = "Select your technical skills";
label.AutoSize = true;
label.Location = new Point(192, 77);
label.Font = new Font("Microsoft Sans Serif", 11);
//Adding label to form
this.Controls.Add(label);
//Creating and setting properties of CheckBox
CheckBox checkbox1 = new CheckBox();
checkbox1.Location = new Point(195, 111);
checkbox1.Text = "C";
//Adding checkbox to form
this.Controls.Add(checkbox1);
CheckBox checkbox2 = new CheckBox();
checkbox2.Location = new Point(195, 156);
checkbox2.Text = "C++";
this.Controls.Add(checkbox2);
CheckBox checkbox3 = new CheckBox();
checkbox3.Location = new Point(195, 195);
checkbox3.Text = "C#";
this.Controls.Add(checkbox3);
CheckBox checkbox4 = new CheckBox();
checkbox4.Location = new Point(195, 235);
checkbox4.Text = "JAVA";
this.Controls.Add(checkbox4);
CheckBox checkbox5 = new CheckBox();
checkbox5.Location = new Point(195, 275);
checkbox5.Text = "HTML";
this.Controls.Add(checkbox5);
}
}
}

Output:

C# 中的复选框

Conclusion – Checkbox in C#

A checkbox in C# can also have an indeterminate state. This can be achieved by setting the CheckState property to ‘Indeterminate. It is a state between ‘Yes’ and ‘No’ in which the checkbox will neither be checked nor unchecked.

C# 中的复选框

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