c# winform 获得局域网内在线IP和计算机名，获取IP，多线程网络编程

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using System.Collections;//ArrayList用
using System.Threading;
using System.Net;

namespace AllTest
{
	public partial class Form7 : Form
	{
		public Form7(string ipPrefix, int startIP, int endIP)
		//public Form7()
		{
			InitializeComponent();

			this.startIP = startIP; 
            this.endIP = endIP; 
            this.ipPrefix = ipPrefix; 
            computerList = new ArrayList();
		}

		private int startIP = 0;
		private int endIP = 0;
		private string ipPrefix = "";
		private ArrayList computerList = null;	

        public void ScanComputers() 
        { 
            for(int i=startIP;i<=endIP;i++) 
            { 
                string scanIP = ipPrefix +"."+i.ToString(); 

                IPAddress myScanIP = IPAddress.Parse(scanIP); 

                IPHostEntry myScanHost = null; 

                string[] arr = new string[2]; 

                try 
                { 
                    myScanHost = Dns.GetHostByAddress(myScanIP); 
                } 

                catch 
                {
                    continue;
                }

                if (myScanHost != null) 
                {
                    arr[0] = myScanHost.HostName; 

                    arr[1] = scanIP; 

                    computerList.Add(arr);
        MessageBox.Show(myScanHost.HostName.ToString());
					MessageBox.Show(scanIP.ToString());
                }
            }
        }

		private void button1_Click(object sender, EventArgs e)
		{
			Form7 cai = new Form7("192.168.1", 134, 135);

			Thread thScan = new Thread(new ThreadStart(cai.ScanComputers));

			thScan.Start();
		} 

	}
}

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