C# 控件移动位置

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  实现控件下面方法即可，比如picDot控件

        private Point mouse_offset;

        private void picDot_MouseDown(object sender, MouseEventArgs e)
        {
            mouse_offset = new Point(-e.X, -e.Y);
        }
         
        private void picDot_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                Point mousePos = Control.MousePosition;
                mousePos.Offset(mouse_offset.X, mouse_offset.Y);
                ((Control)sender).Location = ((Control)sender).Parent.PointToClient(mousePos);
            }
        }