C# 屏幕保护程序设计：简单示例代码

下面是一个使用 C# 设计的简单屏幕保护程序的示例代码：

using System;
using System.Drawing;
using System.Windows.Forms;

namespace ScreenSaver
{
    public class ScreenSaverForm : Form
    {
        private Timer timer;
        private Random random;
        private Point position;
        private Brush brush;

        public ScreenSaverForm()
        {
            InitializeComponent();
        }

        private void InitializeComponent()
        {
            this.timer = new Timer();
            this.random = new Random();
            this.position = new Point();
            this.brush = new SolidBrush(Color.White);

            this.timer.Interval = 1000;
            this.timer.Tick += new EventHandler(this.timer_Tick);

            this.FormBorderStyle = FormBorderStyle.None;
            this.BackColor = Color.Black;
            this.TopMost = true;
            this.StartPosition = FormStartPosition.Manual;
            this.Bounds = Screen.PrimaryScreen.Bounds;
        }

        private void timer_Tick(object sender, EventArgs e)
        {
            this.position.X = this.random.Next(this.Bounds.Width);
            this.position.Y = this.random.Next(this.Bounds.Height);

            this.Invalidate();
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);

            Graphics graphics = e.Graphics;
            graphics.FillEllipse(this.brush, this.position.X, this.position.Y, 50, 50);
        }

        protected override void OnKeyDown(KeyEventArgs e)
        {
            base.OnKeyDown(e);

            // 退出屏幕保护程序
            Application.Exit();
        }

        protected override void OnMouseMove(MouseEventArgs e)
        {
            base.OnMouseMove(e);

            // 退出屏幕保护程序
            Application.Exit();
        }

        protected override void OnMouseClick(MouseEventArgs e)
        {
            base.OnMouseClick(e);

            // 退出屏幕保护程序
            Application.Exit();
        }

        [STAThread]
        public static void Main()
        {
            Application.Run(new ScreenSaverForm());
        }
    }
}

这个屏幕保护程序会在屏幕上随机绘制一个白色的圆形。当鼠标移动或点击时，程序会退出。按任意键也可以退出程序。你可以根据需要自定义屏幕保护程序的绘制内容和行为。