我想在C#的picturebox上选定一个区域，如何编程？

能说明白点不，类似选中控件？

选中一块很容易，关键是选中之后你要作什么？

选中后保存矩形的坐标，并将选中部分放大

我是新手不知道在那里发帖子，望大家给与指导谢谢!!!!!!!

保存在哪里？放大的部分放哪里

放大部分放在另一个图片框里

明白了，看源码：
using System;
using System.Collections.Generic;
using
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
 
namespace fangda
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void pictureBox1_Click(object sender, EventArgs e)
        {
 
        }
        int a, b, c, d;
        
        Rectangle r=new Rectangle();
        Graphics g;  
        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
           
            a = e.X;
            b = e.Y;
            this.pictureBox2.Image = null;
        }
 
        private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
        {
 
            Image i=this.pictureBox1.Image;
            c = e.X;
            d = e.Y;
           
            r.Location = new Point(a, b);
            r.Width = c - a;
            r.Height = d - b;
            Rectangle g1=new Rectangle();
            g1.Location = new Point(0,0);
            g1.Width = r.Height * 2;
            g1.Height = r.Height * 2;
            
            g.DrawImage(i, g1, r, GraphicsUnit.Pixel);
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
           g = this.pictureBox2.CreateGraphics();
        }
    }
}

我试了怎么没有反应啊？能不能鼠标选中的时候能明显的看出选的痕迹啊？

哦，试出来了，谢谢！