How to use the ColorDialog control in WinForms?

Using the ColorDialog control in WinForms allows users to select colors. Here is a simple example code demonstrating how to use the ColorDialog control in WinForms:

using System;
using System.Windows.Forms;

namespace ColorDialogExample
{
    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
        }

        private void btnSelectColor_Click(object sender, EventArgs e)
        {
            ColorDialog colorDialog = new ColorDialog();

            if (colorDialog.ShowDialog() == DialogResult.OK)
            {
                // 获取用户选择的颜色
                Color selectedColor = colorDialog.Color;

                // 在label中显示选择的颜色
                lblSelectedColor.BackColor = selectedColor;
                lblSelectedColor.Text = string.Format("RGB: ({0}, {1}, {2})", selectedColor.R, selectedColor.G, selectedColor.B);
            }
        }
    }
}

In the example above, we created a WinForms window that has a button and a label added to it. When the user clicks the button, a ColorDialog window pops up, allowing the user to choose a color. After selecting a color, the RGB value of the color chosen will be displayed in the label, and the label’s background color will be set to the color chosen by the user.

Please note that the ShowDialog method of the ColorDialog control returns a DialogResult enum value, which we can use to perform respective operations based on the user’s selection.