C# 获取*IP地址

直接上代码：
public static string getLocalIP()
        {
            String direction = "";
            string url = "http://checkip.dyndns.org/";
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "PROPFIND";
            request.ContentType = "application/x-www-form-urlencoded;charset:utf-8";        
            using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
                {
                    Stream stream = response.GetResponseStream();
                    using (StreamReader streamReader = new StreamReader(stream, Encoding.UTF8))
                    {
                    direction = streamReader.ReadToEnd().ToString();
                    }
                }          
            //Search for the ip in the html
            int first = direction.IndexOf("Address: ") + 9;
            int last = direction.LastIndexOf("</body>");
            direction = direction.Substring(first, last - first);
            return direction;
        }