C#中做一个网段扫描该怎么写啊？

Question

程序功能如下：
1，我已知一个网段如：192.168.0.***这个网段
2，我要对这个网络内的所有机器扫描，返回每个IP对应的Aliases
问题如下：
1，我使用System.Net名称空间下的控件，但是不知道怎么给IPAddress赋值
2，我做的程序思路如下
for(i=0;i<256;i++)
{    //扫描并显示 每个IP对应的Aliases   }关键问题：我不知道如何给IPAddress赋值，程序很简单的，我看MSDN也没有找到如何给IPAddress进行赋值！所以问一下大家有哪些方法能实现这个功能！
很诚挚的求教！
谢谢每一位回帖的朋友了先！

Answer 1

这个很简单 但是必须使用多线程序 不然的话爆慢
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using System.Net.NetworkInformation;
using System.Drawing.Imaging;
using System.Net;namespace 多线程
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        Ping p = new Ping();
        int[] success = new int[256];
        int[] time_out = new int[256];
        int ss = 0;
        int tt = 0;
        int jj = 0;
        int y = 5;
        int stop;
        int start;
        int timeout;
        DateTime qs,zz;        public void scan(object s)
        {
            CheckForIllegalCrossThreadCalls = false;
            string[] ip;
            if (p.Send(s.ToString(), timeout).Status == IPStatus.Success)
            {
                ip = s.ToString().Split('.');
                success[ss] = int.Parse(ip[3]);
                ss++;
                jj++;
            }
            else
            {
                ip = s.ToString().Split('.');
                time_out[tt] = int.Parse(ip[3]);
                tt++;
                jj++;
            }
            if (jj == stop - start)
            {
                Thread.Sleep(1000);
                gdi();
                label7.Text = "响应:" + ss.ToString();
                ss = 0;
                tt = 0;
                jj = 0;
                y = 5;
                zz = DateTime.Now;
                label5.Text = "终止:" + zz.ToLongTimeString();
                TimeSpan ts;
                ts = zz.AddSeconds(1) - qs;
                label6.Text = "用时:" + ts.ToString().Substring(0, 8);
            }
        }        public void gdi()
        {
            Bitmap b = new Bitmap(320, 320);
            pictureBox1.Image = b;
            Graphics g = Graphics.FromImage(b);            Font f = new Font("宋体", 9F);
            SolidBrush text = new SolidBrush(SystemColors.ControlText);
            SolidBrush lime = new SolidBrush(Color.Lime);
            SolidBrush red = new SolidBrush(Color.Red);
            for (int i = 1; i < 17; i++)
            {
                g.DrawLine(new Pen(Color.Gainsboro), 0, i * 20, 320, i * 20);
                g.DrawLine(new Pen(Color.Gainsboro), i * 20, 0, i * 20, 320);
            }            for (int i = 3, j = start; (i < 320) & (j < stop); i = i + 20, j++)
            {
                foreach (int ii in success)
                {
                    if (j < 100)
                    {
                        if (ii == j)
                        {
                            g.DrawString(j.ToString(), f, lime, i, y);
                            if (i == 303)
                            {
                                i = -17;
                                y = y + 20;
                            }
                        }
                    }
                    else
                    {
                        if (ii == j)
                        {
                            g.DrawString(j.ToString(), f, lime, i - 3, y);
                            if (i == 303)
                            {
                                i = -17;
                                y = y + 20;
                            }
                        }
                    }
                }
                foreach (int ii in time_out)
                {
                    if (j < 100)
                    {
                        if (ii == j)
                        {
                            g.DrawString(j.ToString(), f, text, i, y);
                            if (i == 303)
                            {
                                i = -17;
                                y = y + 20;
                            }
                        }
                    }
                    else
                    {
                        if (ii == j)
                        {
                            g.DrawString(j.ToString(), f, text, i - 3, y);
                            if (i == 303)
                            {
                                i = -17;
                                y = y + 20;
                            }
                        }
                    }
                         
                }
            }
            pictureBox1.Refresh();
            g.Dispose();
        }        private void button1_Click(object sender, EventArgs e)
        {
            string[] ip = new string[stop];
            Thread[] t = new Thread[stop];
            for (int i = start; i < stop; i++)
            {
                ip[i] = textBox1.Text + "." + textBox2.Text + "." + textBox3.Text + "." + i.ToString();
                t[i] = new Thread(new ParameterizedThreadStart(scan));
                t[i].Start(ip[i]);
            }
            qs = DateTime.Now;
            label4.Text = "启始:" + qs.ToLongTimeString();
        }        private void button3_Click(object sender, EventArgs e)
        {
            this.Close();
        }        private void Form1_Load(object sender, EventArgs e)
        {
            IPHostEntry myHost = new IPHostEntry();
            myHost = Dns.GetHostByName(Dns.GetHostName());
            string ip = myHost.AddressList[0].ToString();
            string[] str = ip.Split('.');
            textBox1.Text = str[0];
            textBox2.Text = str[1];
            textBox3.Text = str[2];            start = int.Parse(textBox4.Text);
            stop = int.Parse(textBox5.Text) + 1;
            timeout = int.Parse(textBox6.Text);
        }        private void textBox5_Leave(object sender, EventArgs e)
        {
            stop = int.Parse(textBox5.Text) + 1;
        }        private void textBox4_Leave(object sender, EventArgs e)
        {
            start = int.Parse(textBox4.Text);
        }        private void textBox6_Leave(object sender, EventArgs e)
        {
            timeout = int.Parse(textBox6.Text);
        }
    }
}