自定义一个picturebox然后给他注册一个事件

private void pictureBox1_Click(object sender, EventArgs e)
{
    int x = (sender as PictureBox).Location.X;
    int y = (sender as PictureBox).Location.Y;
    int width = (sender as PictureBox).Width;
    int height= (sender as PictureBox).Height;

    if (x < 0 || x > this.Width - width)
    {
        x = 0;
    }
    if (y < 0 || y > this.Height - height)
    {
        y = 0;
    }
    (sender as PictureBox).Location = new Point(x, y);
}