C # to determine IP format to obtain current client IP

Visual C # IP related Operations class, to obtain the current client IP, to determine the IP format, that is, detect whether the IP address, some of the basic operation of IP, welcome C # Novice Reference:

01///

02///gets the IP of the current page client

03///

04///The current page client's IP

05public static string GetIP ()

269

Modified string result = String.Empty;

result = httpcontext.current.request.servervariables["http_x_forwarded_for"];

if (Null = result | | = = String.Empty)

10 {

One result = httpcontext.current.request.servervariables["REMOTE_ADDR"];

12}

if (Null = result | | = = String.Empty)

14 {

result = HttpContext.Current.Request.UserHostAddress;

16}

if (Null = result | |) result = = String.Empty | |! IsIP (Result))

18 {

return "0.0.0.0";

20}

return result;

22}

23///

Whether the 24///is IP

25///

26///

27///

28public static bool IsIP (string IP)

099

return Regex.IsMatch (IP, @ "^" (2[0-4]d|25[0-5]|[ 01]?dd?). {3} (2[0-4]d|25[0-5]| [01]?dd?] $");

31}