程序代码：

        Thread thread1, thread2;
        Message m;
        Keys k;
        int x1 = 0, y1 = 0, x2, y2;
        Bitmap pic1 = new Bitmap("C:\\Users\\llq664301573\\Desktop\\res\\己方1上.gif");
        Bitmap pic2 = new Bitmap("C:\\Users\\llq664301573\\Desktop\\res\\己方1下.gif");
        Bitmap pic3 = new Bitmap("C:\\Users\\llq664301573\\Desktop\\res\\己方1左.gif");
        Bitmap pic4 = new Bitmap("C:\\Users\\llq664301573\\Desktop\\res\\己方1右.gif");
        public void func1()
        {
            switch (k)
            {
                case Keys.Up:
                    y1 -= 8;
                    pictureBox1.Top = y1;
                    pictureBox1.Image = pic1;
                    pictureBox1.Width = pic1.Width;
                    pictureBox1.Height = pic1.Height;
                    break;
                case Keys.Down:
                    y1 += 8;
                    pictureBox1.Top = y1;
                    pictureBox1.Image = pic2;
                    pictureBox1.Width = pic2.Width;
                    pictureBox1.Height = pic2.Height;
                    break;
                case Keys.Left:
                    x1 -= 8;
                    pictureBox1.Left = x1;
                    pictureBox1.Image = pic3;
                    pictureBox1.Width = pic3.Width;
                    pictureBox1.Height = pic3.Height;
                    break;
                case Keys.Right:
                    x1 += 8;
                    pictureBox1.Left = x1;
                    pictureBox1.Image = pic4;
                    pictureBox1.Width = pic4.Width;
                    pictureBox1.Height = pic4.Height;
                    break;
                default:
                    break;
            }
            Thread.Sleep(10);
        }
        public void func2()
        {
            switch (k)
            {
                case Keys.W:
                    y2 -= 8;
                    pictureBox2.Top = y2;
                    pictureBox2.Image = pic1;
                    pictureBox2.Width = pic1.Width;
                    pictureBox2.Height = pic1.Height;
                    break;
                case Keys.S:
                    y2 += 8;
                    pictureBox2.Top = y2;
                    pictureBox2.Image = pic2;
                    pictureBox2.Width = pic2.Width;
                    pictureBox2.Height = pic2.Height;
                    break;
                case Keys.A:
                    x2 -= 8;
                    pictureBox2.Left = x2;
                    pictureBox2.Image = pic3;
                    pictureBox2.Width = pic3.Width;
                    pictureBox2.Height = pic3.Height;
                    break;
                case Keys.D:
                    x2 += 8;
                    pictureBox2.Left = x2;
                    pictureBox2.Image = pic4;
                    pictureBox2.Width = pic4.Width;
                    pictureBox2.Height = pic4.Height;
                    break;
                default:
                    break;
            }
            Thread.Sleep(10);
        }
        protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
        {
            m = msg;
            k = keyData;
            thread1 = new Thread(new ThreadStart(func1));//生成线程类对象
            thread1.Start();
            thread2 = new Thread(new ThreadStart(func2));//生成线程类对象
            thread2.Start();
           
            return base.ProcessCmdKey(ref msg, keyData);
        }