c# 鼠标移动带边框的pictureBox

Point orignalPoint = new Point();//记录鼠标按下时的坐标
Rectangle orignalPosition;//记录边框

private void pictureBox_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button != MouseButtons.Left) return;
//记录鼠标按下时的坐标
orignalPoint =e.Location;
//生成边框
orignalPosition = new Rectangle(0, 0, ((Control)sender).Width, ((Control)sender).Height);
//设置边框起始位置
orignalPosition.Offset(this.PointToScreen(((Control)sender).Location));
//画边框
ControlPaint.DrawReversibleFrame(orignalPosition, Color.Blue, FrameStyle.Thick);

}

private void pictureBox_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button != MouseButtons.Left) return;
//移动边框
orignalPosition.Offset(e.X - orignalPoint.X, e.Y - orignalPoint.Y);
ControlPaint.DrawReversibleFrame(orignalPosition, Color.Blue, FrameStyle.Thick);
//移动图片
//当前点的横坐标减鼠标按下时的横坐标
this.Left+=e.X-orignalPoint.X;
//当前点的纵坐标减鼠标按下时的纵坐标
this.Top += e.Y - orignalPoint.Y;

}

private void pictureBox_MouseUp(object sender, MouseEventArgs e)
{
ControlPaint.DrawReversibleFrame(orignalPosition, Color.Blue, FrameStyle.Thick);
}