C#获取本机外网ip

由于ip地址是变动的，所以我们需要自动获取到外网的ip，然后我就写了一段code来自动获取到外网的ip，就不需要每次手写了，就方便多了。

using System; using System.Net; using System.Text.RegularExpressions;  namespace ConsoleApplication1 {     class Program     {         static void Main(string[] args)         {             try             {                 WebClient client = new WebClient();                 client.Encoding = System.Text.Encoding.Default;                 string response = client.UploadString("http://iframe.ip138.com/ipcity.asp", "");                 Match mc = Regex.Match(response, @"location.href=""(.*)""");                 if (mc.Success && mc.Groups.Count > 1)                 {                     response = client.UploadString(mc.Groups[1].Value, "");                     string[] str1 = response.Split('[');                     response = str1[1];                     string [] str = response.Split(']');                     response = str[0];                     Console.Write(response);                 }             }             catch (System.Exception e)             {             }             Console.Read();         }     } } 

结果：