Form1.cs

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using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
// 下载于www.51aspx.com
namespace RuntimeAdjustControlApp
{
    public partial class Form1 : Form
    {

        private Point startPos;
        private Rectangle mouseRect = Rectangle.Empty;

        public Form1()
        {
            InitializeComponent();
        }

        private void DrawRectangle()
        {
            Rectangle rect = this.RectangleToScreen(mouseRect);
            ControlPaint.DrawReversibleFrame(rect, this.BackColor, FrameStyle.Dashed);
        }

        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            
            if (e.Button != MouseButtons.Left)
            {
                return;
            }

            startPos = new Point(e.X, e.Y);
            this.Capture = true;
            Cursor.Clip = this.RectangleToScreen(new Rectangle(0, 0, ClientSize.Width, ClientSize.Height));
            mouseRect = new Rectangle(startPos.X, startPos.Y, 0, 0);

            Queue<CRectControl> q = new Queue<CRectControl>();
            foreach (Control ctl in this.Controls)
            {
                if (ctl is CRectControl)
                {
                    q.Enqueue((CRectControl)ctl);
                }
            }

            while (q.Count > 0)
            {
                CRectControl item = q.Dequeue();
                item.Free();
                this.Controls.Remove(item);
            }

            q = null;

        }

        private void Form1_MouseMove(object sender, MouseEventArgs e)
        {