在winform窗体中如何实现框选多个项目？

Question

请教各位：
winform窗体Form1 中有多个按钮按钮，如何实现和“在资源管理器中用鼠标框选多个项目”的操作？
我有俩点不清楚：
1、怎样实现让鼠标在窗体上面框选时出现一个矩形选择框？
2、有了矩形选择框后，如何才能确定在矩形框之内的按钮控件？

Answer 1

ListView与TreeView实现的文件列表，用C#拉出虚线框也是多条记录选择的方式

Answer 2

http://blog.csdn.net/wzuomin/archive/2006/12/13/1441007.aspx

Answer 3

1.处理鼠标消息，MouseDown的时候开始画，MouseMove的时候变化，MouseUp的时候计算。
2.使用Rectangle的IntersectWith方法，逐一判断各控件的Bounds是否与此矩形相交。

Answer 4

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using MapDemoControlLibrary;namespace MapDemoTest
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
            pen = new Pen(Color.Red);            UCPoint but;
            for (int i = 0; i < 5; i++)
            {
                but = new UCPoint() { LabelText = "bt" + i, Image = global::MapDemoTest.Properties.Resource1.point1,UCPointArea = UCPointArea.BaseMapFrom };
                this.pictureBox1.Controls.Add(but);
            }
            
        }
        
        Pen pen = null;
        Point PTStart;
        Rectangle GraphicsRectangle;
        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                PTStart = new Point(e.X, e.Y);
            }
        }        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                int x = PTStart.X ;
                int y = PTStart.Y;
                int width = e.X - PTStart.X;
                int height = e.Y - PTStart.Y;                if (width < 0)
                {
                    x = e.X;
                    width = Math.Abs(width);
                }
                if (height < 0)
                {
                    y = e.Y;
                    height = Math.Abs(height);
                }
                //绘制矩形的范围
                if (e.X > this.pictureBox1.Size.Width - 2 || e.X < 1 || e.Y > this.pictureBox1.Size.Height - 2 || e.Y < 1) return;
                GraphicsRectangle = new Rectangle(this.pictureBox1.PointToScreen(new Point(x, y)), new Size(width, height));
                this.PictureBoxRefresh();
                ControlPaint.DrawReversibleFrame(GraphicsRectangle , Color.Yellow, FrameStyle.Dashed);                this.toolStripStatusLabel1.Text = "sX:" + x;
                this.toolStripStatusLabel2.Text = " sY:" + y;
                this.toolStripStatusLabel3.Text = " width:" + width;
                this.toolStripStatusLabel4.Text = " height:" + height;
                this.toolStripStatusLabel5.Text = " eX:" + e.X.ToString();
                this.toolStripStatusLabel6.Text = " eY:" + e.Y.ToString();
               
            }
        }        private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                foreach (UCPoint p in this.pictureBox1.Controls)
                {
                    if (GraphicsRectangle.IntersectsWith(new Rectangle(this.pictureBox1.PointToScreen(p.Location), p.Size)))
                        if (p.Selected)
                            p.Selected = false;
                        else
                            p.Selected = true;
                    else
                        p.Selected = false;
                }
                GraphicsRectangle = new Rectangle();
               this.PictureBoxRefresh();
            }
        }        /// <summary>
        /// 重绘控件
        /// </summary>
        private void PictureBoxRefresh()
        {
            foreach (Control c in this.pictureBox1.Controls)
            {
                c.Refresh();
            }
            this.pictureBox1.Refresh();
        }
    }
}