winform拖动鼠标显示矩形选择区域

因为最近一个项目通过winform做一个仓库的2D俯视仿真图，其中客户要求能对存储箱做“柔性分区”。所以想通过鼠标拖动矩形框选择控件的方式来确定用户想要的分区。在网上搜寻了一下winform的鼠标拖动矩形框的代码，对他的代码(http://heisetoufa.iteye.com/blog/380977)整理了一下。兹只以博客为笔记本来加强记忆。

#region mouseRectanger
        void panel1_MouseUp(object sender, MouseEventArgs e)
        {
            //this.Capture = false;
            this.panel1.Capture = false;
            Cursor.Clip = Rectangle.Empty;
            MouseIsDown = false;
        }
      
        private void panel1_MouseDown(object sender, MouseEventArgs e)
        {            
            DrawRectangle();
            MouseIsDown = true;
            DrawStart(e.Location);    
        }
        private void panel1_MouseMove(object sender, MouseEventArgs e)
        {
            if (MouseIsDown)
                ResizeToRectangle(e.Location);
        }
        private void ResizeToRectangle(Point p)
        {
            DrawRectangle();
            MouseRect.Width = p.X - MouseRect.Left;
            MouseRect.Height = p.Y - MouseRect.Top;
            DrawRectangle();
        }  
        private void DrawRectangle()
        {
            Rectangle rect = this.RectangleToScreen(MouseRect);
            ControlPaint.DrawReversibleFrame(rect, Color.Green, FrameStyle.Dashed);
        }
        private void DrawStart(Point StartPoint)
        {
            //this.Capture = true;
            this.panel1.Capture = true;
            //这是设置鼠标筐选时鼠标的移动区域 和控件对鼠标的捕获
            //Cursor.Clip = this.RectangleToScreen(new Rectangle(0, 0, ClientSize.Width, ClientSize.Height));
            Cursor.Clip = this.RectangleToScreen(this.panel1.ClientRectangle); 
            MouseRect = new Rectangle(StartPoint.X, StartPoint.Y, 0, 0);
        }    

#endregion

绿线为鼠标拖出的矩形选择框，中间为PictureBox控件，表示储物箱

以下是获取选择区内的控件

Control interSectCtl = null;
            foreach (Control ctl in panel1.Controls)
            {
                if (ctl.Bounds.IntersectsWith(MouseRect))
                {
                    interSectCtl = ctl;
                    if (interSectCtl.GetType() == typeof(System.Windows.Forms.PictureBox))
                    {
                        PictureBox picBox = (PictureBox)ctl;
                    }
                    continue;
                }
            }