使用c#根据IP获取物理地址

格式是 

城市+网络接入商名称+IP地址

要根据IP获得物理地址 必须先获得留言用户的IP 这里不讨论

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.Web;
using System.Text.RegularExpressions;
using System.Collections;
using System.Net;
using System.Xml;



namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        /// 

        /// 点击了查询
        /// 

        /// 
        /// 
        private void button1_Click(object sender, EventArgs e)
        {
            // 获取用户输入的IP地址
            string ip = textBox1.Text;

            // 根据IP 显示出物理地址
            MessageBox.Show(GetstringIpAddress(ip));
        }

        /// 

        /// 根据IP 获取物理地址
        /// 

        /// 
        /// 
        public static string GetstringIpAddress(string strIP)//strIP为IP
        {
            string sURL = "http://www.youdao.com/smartresult-xml/search.s?type=ip&q=" + strIP + "";//youdao的URL
            string stringIpAddress = "";
            using (XmlReader read = XmlReader.Create(sURL))//获取youdao返回的xml格式文件内容
            {
                while (read.Read())
                {
                    switch (read.NodeType)
                    {
                        case XmlNodeType.Text://取xml格式文件当中的文本内容
                            if (string.Format("{0}", read.Value).ToString().Trim() != strIP)
                            {
                                stringIpAddress = string.Format("{0}", read.Value).ToString().Trim();//赋值
                            }
                            break;
                        //other
                    }
                }
            }
            return stringIpAddress;
        }
    }
}