获取访问IP,程序池访问，非局域网IP地址

 通过WebRequest类访问得到IP：

 System.Net.WebRequest wReq = System.Net.WebRequest.Create("http://ip.chinaz.com/getip.aspx");//站长工具提供Ip地址
 System.Net.WebResponse wResp = wReq.GetResponse();
 System.IO.Stream respStream = wResp.GetResponseStream();
 using (System.IO.StreamReader reader = new System.IO.StreamReader(respStream, Encoding.GetEncoding("utf-8")))
 {
 　　var json = new JavaScriptSerializer().Deserialize<ipModel>(reader.ReadToEnd());
 　　return json.ip;
 }

 反序列化时用到的类：

        /// <summary>
        /// IP访问返回类
        /// </summary>
        public class ipModel
        {
            public string ip { get; set; }
            public string address { get; set; }
        }

 注意：得到是外网IP，并非局域网IP