asp.net IPÏÞÖƵǽ

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 public string getip(string ip)
    {
       String[] arr=ip.Split(new char[] {'.'});
       string str = "";
       for (int i = 0; i < arr.Length; i++)
       {
           if (str == "")
           {
               string str1="000" + arr[0].ToString();
               str = str1.Substring(str1.Length - 3);
           }
           else
           {
               string str1 = "000" + arr[i].ToString();
               str = str + str1.Substring(str1.Length - 3);
           }
       }
       return str;
    }