C# 根据ip获取城市等相关信息

/// <summary> 
/// 得到真实IP以及所在地详细信息（Porschev） 
/// </summary> 
/// <returns></returns> 
public string GetIpDetails() 
{ 
//设置获取IP地址和国家源码的网址 
string url = "http://www.ip138.com/ips8.asp"; 
string regStr = "(?<=<td\\s*align=\\\"center\\\">)[^<]*?(?=<br/><br/></td>)"; 
//IP正则 
string ipRegStr = "((2[0-4]\\d|25[0-5]|[01]?\\d\\d?)\\.){3}(2[0-4]\\d|25[0-5]|[01]?\\d\\d?)"; 
//IP地址 
string ip = string.Empty; 
//国家 
string country = string.Empty; 
//省市 
string adr = string.Empty; 
//得到网页源码 
string html = GetHtml(url); 
Regex reg = new Regex(regStr, RegexOptions.None); 
Match ma = reg.Match(html); html = ma.Value; 
Regex ipReg = new Regex(ipRegStr, RegexOptions.None); 
ma = ipReg.Match(html); 
//得到IP 
ip = ma.Value; 
int index = html.LastIndexOf("：") + 1; 
//得到国家 
country = html.Substring(index); 
adr = GetAdrByIp(ip); 
return "IP：" + ip + " 国家：" + country + " 省市：" + adr; 
} 
/// <summary> 
/// 通过IP得到IP所在地省市（Porschev） 
/// </summary> 
/// <param name="ip"></param> 
/// <returns></returns> 
public string GetAdrByIp(string ip) 
{ 
string url = "http://www.cz88.net/ip/?ip=" + ip; 
string regStr = "(?<=<span\\s*id=\\\"cz_addr\\\">).*?(?=</span>)"; 
//得到网页源码 
string html = GetHtml(url); 
Regex reg = new Regex(regStr, RegexOptions.None); 
Match ma = reg.Match(html); 
html = ma.Value; 
string[] arr = html.Split(' '); 
return arr[0]; 
}

/// <summary> 
/// 获取HTML源码信息(Porschev) 
/// </summary> 
/// <param name="url">获取地址</param> 
/// <returns>HTML源码</returns> 
public string GetHtml(string url) 
{ 
string str = ""; 
try 
{ 
Uri uri = new Uri(url); 
WebRequest wr = WebRequest.Create(uri); 
Stream s = wr.GetResponse().GetResponseStream(); 
StreamReader sr = new StreamReader(s, Encoding.Default); 
str = sr.ReadToEnd(); 
} 
catch (Exception e) 
{ 
} 
return str; 
}