网络编程--System.Net

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net;

namespace dns类
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            label5.Text = string.Empty;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if(textBox1.Text == string.Empty)
            {
                MessageBox.Show("请输入IP地址");
            }
            else
            {
                textBox2.Text = string.Empty;
                textBox3.Text = string.Empty;
                textBox4.Text = string.Empty;
                
                IPAddress[] ips = Dns.GetHostAddresses(textBox1.Text);
                foreach(IPAddress ip in ips)
                {
                    textBox2.Text = ip.ToString();

                    label5.Text += "网际协议地址：" + ip.Address + "
Ip地址的地址族：" + ip.AddressFamily.ToString() + "
是否是IPv6连接本地地址：" + ip.IsIPv6LinkLocal;

                }
                textBox3.Text = Dns.GetHostName();
               // textBox4.Text = Dns.GetHostByName(Dns.GetHostName()).HostName;
            }
        }

        private void label4_Click(object sender, EventArgs e)
        {

        }


    }
}

　

WebRequest 和 WebResponse类的使用

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net;
using System.IO;

namespace dns类
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            richTextBox1.Text = string.Empty;
            //创建WebRequest对象
            WebRequest webreq = WebRequest.Create(textBox1.Text);
            //设置用于对Internet资源请求进行身份验证的网络凭证
            webreq.Credentials = CredentialCache.DefaultCredentials;
           
            //调用WebRequest对象的各种属性获取WebRequest请求的相关信息
            richTextBox1.Text += "请求数据内容长度：" + webreq.ContentLength;
            richTextBox1.Text += "
该请求的协议方法：" + webreq.Method;
            richTextBox1.Text += "
访问Internet的网络代理：" + webreq.Proxy;
            richTextBox1.Text += "
Internet URI：" + webreq.RequestUri;
            richTextBox1.Text += "
超时：" + webreq.Timeout;

            //创建WebResponse对象
            WebResponse webres = webreq.GetResponse();
            richTextBox1.Text += "
相应请求的URI" + webres.ResponseUri;
            //创建StreamReader流读取对象
            Stream stream = webres.GetResponseStream();
            StreamReader sreader = new StreamReader(stream);
            richTextBox1.Text += "
" + sreader.ReadToEnd();
            sreader.Close();
            stream.Close();
            webres.Close();

        }


    }
}