c# 中获取主机的DNS域名（练习单线程，多线程，线程池）

来源：互联网发布：sql exists 怎么用编辑：程序博客网时间：2024/06/08 14:45

1.项目结构图如下：

2.运行效果如下：

3.核心源代码：

Form1.cs中的源码（设计源码省略，由于单线程，多线程，线程池只有部分源码不同，将其合到一处）

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 System.Net;using System.Threading;namespace ScanComputer{    public partial class Form1 : Form    {        public string start;//记录当前IP字符串        public int n;//计数        public DateTime dt1;//当前时间        public Form1()        {            InitializeComponent();        }        private void button1_Click(object sender, EventArgs e)        {            groupBox1.Enabled = false;            button1.Enabled = false;            listBox1.Items.Clear();            int ipCount =n= (int)numericUpDown5.Value - (int)numericUpDown4.Value + 1;//计算总IP数量            // 多线程            //Thread[] scanthreads = new Thread[ipCount];            //for (int i = 0; i < ipCount; i++)            //{            //  start = numericUpDown1.Value + "." + numericUpDown2.Value + "." + numericUpDown3.Value + "." + (numericUpDown4.Value+i);            //  scan sc = new scan(this);            //  sc.ip = start;            //  scanthreads[i] = new Thread(sc.CheckComputer);            //  scanthreads[i].Name = i.ToString();            //  scanthreads[i].Start();            //}            //线成池            //scan[] sc = new scan[ipCount];            //dt1 = DateTime.Now;//记下当前时间            //for (int i = 0; i < ipCount; i++)            //{            //    start = numericUpDown1.Value + "." + numericUpDown2.Value + "." + numericUpDown3.Value + "." + (numericUpDown4.Value + i);            //    sc[i] = new scan(this);            //    sc[i].ip = start;            //    //ThreadPool.QueueUserWorkItem(new WaitCallback(sc[i].CheckComputer));            //}            //单线程            scan sc = new scan(this);            dt1 = DateTime.Now;//记下当前时间            for (int i = 0; i < ipCount; i++)            {                start = numericUpDown1.Value + "." + numericUpDown2.Value + "." + numericUpDown3.Value + "." + (numericUpDown4.Value + i);                sc.ip = start;                object o = null;                sc.CheckComputer(o);            }        }        public delegate void GetComputerDnsDelegate(string strIP, string strHostName);//在一个线程中访问另一个线程（此处为main线程）的控件要使用委托        public void addInfotoListbox(string strIP,string hostName)        {            if (listBox1.InvokeRequired)            {                GetComputerDnsDelegate get = addInfotoListbox;                listBox1.Invoke(get, strIP, hostName);            }            else            {                n--;                this.listBox1.Items.Add("IP地址----" + strIP + ",Dns域名---" + hostName+" ");                if (n == 0)//若n=0说明所有线程已经完成任务，输出总时间                {                    DateTime dt2 = DateTime.Now;                    TimeSpan ts = dt2 - dt1;                    string str=string.Format("总共用了{0:0.00}毫秒" , ts.TotalMilliseconds);//精确到0.00毫秒                    this.listBox1.Items.Add(str);                    this.groupBox1.Enabled = true;                    button1.Enabled = true;                }            }        }    }}

scan.cs源代码

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Net;using System.Windows.Forms;using System.Threading;namespace ScanComputer{    class scan    {        Form1 form;        public string ip;        IPAddress IP;        public scan(Form1 form)        {            this.form = form;        }        public void CheckComputer(object obj)        {            try            {                IP = IPAddress.Parse(ip);            }            catch            {                MessageBox.Show("不合法的IP地址！");            }            try            {                string hostname = Dns.GetHostEntry(IP).HostName;                form.addInfotoListbox(ip, hostname);            }            catch            {                return;            }        }    }}