做了一个简单的例子：在Form1 中放置一个 PictureBox 和 一个 Timer,

运行后会在 PictureBox 的中央画一个矩形，然后每秒旋转10度。 

   public partial class Form1 : Form
    {
        private float angle = 0;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            pictureBox1.BackColor = Color.White;
            pictureBox1.Dock = DockStyle.Fill;
            timer1.Interval = 1000;
            timer1.Enabled = true;

        }

        private void pictureBox1_Paint(object sender, PaintEventArgs e)
        {

            int width = 20;
            int height = 40;

            int x = (pictureBox1.Width - width) / 2;
            int y = (pictureBox1.Height - height) / 2;

            e.Graphics.TranslateTransform(x, y);
            e.Graphics.RotateTransform(angle);
            angle += 10;

            e.Graphics.DrawRectangle(new Pen(Color.Black, 1), new Rectangle(0 - width/2, 0 - height/2, width, height));
           
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            pictureBox1.Invalidate();
            pictureBox1.Update();
        }