C # Get real IP Address implementation method

In general, the usual way to get a user's IP address is:

1 stringIpAddress ="";2 if((httpcontext.current.request.servervariables["http_x_forwarded_for"]!=NULL 3&& httpcontext.current.request.servervariables["http_x_forwarded_for"] !=String.Empty))4 {5ipaddress=httpcontext.current.request.servervariables["http_x_forwarded_for"] ;6 }7 Else8 { 9httpcontext.current.request.servervariables["REMOTE_ADDR"]; Ten}

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In fact, the above code only trial with the user only use 1 layer agent, if the user has 2 layers, 3 layer http_x_forwarded_for value is: "Native real ip,1 layer proxy ip,2 layer proxy IP,.....", If the length of the IP field in your data is very small (15 bytes), the database will get an error.

In practical applications, there are few such users because of the relatively small number of transparent proxies used.

How to get the real IP of the user:

1 usingSystem;2 usingSystem.Data;3 usingSystem.Configuration;4 usingsystem.web;5 usingSystem.Web.Security;6 usingSystem.Web.UI;7 usingSystem.Web.UI.WebControls;8 usingSystem.Web.UI.WebControls.WebParts;9 usingSystem.Web.UI.HtmlControls;Ten usingSystem.Text.RegularExpressions; One namespaceCommon A { -     /// <summary> -     ///Summary description of IPAddress the     /// </summary> -  Public classIPAddress:System.Web.UI.Page - { -      Public StaticInt64 Todenaryip (stringIP) +     { -Int64 _int64 =0; +         string_IP =IP; A         if(_ip. LastIndexOf (".") >-1 ) at         { -             string[] _iparray = _ip. Split ('.' ); -_int64 = Int64.parse (_iparray. GetValue (0). ToString ()) * the* the* the+ Int64.parse (_iparray. GetValue (1). ToString ()) * the* the+ Int64.parse (_iparray. GetValue (2). ToString ()) * the+ Int64.parse (_iparray. GetValue (3). ToString ())-1; -         } -         return_int64; -     } in     /// <summary> -     //// IP Decimal to     /// </summary> +      Public StaticInt64 Denaryip -     { the         Get { *Int64 _int64 =0; $             string_IP =IP;Panax Notoginseng             if(_ip. LastIndexOf (".") >-1 ) -             { the                 string[] _iparray= _ip. Split ('.' ); +_int64 = Int64.parse (_iparray. GetValue (0). ToString ()) * the* the* the+ Int64.parse (_iparray. GetValue (1). ToString ()) * the* the+ Int64.parse (_iparray. GetValue (2). ToString ()) * the+ Int64.parse (_iparray. GetValue (3). ToString ())-1; A             } the             return_int64; +         } -     } $      Public Static stringIP $     { -         Get -         { the             stringresult =String.Empty; -result = httpcontext.current.request.servervariables["http_x_forwarded_for"];Wuyi             if(Result! =NULL&& Result! =String.Empty) the             { -                //may have an agent Wu                 if(result.) IndexOf (".") == -1)//no "." Must be a non-IPv4 format -result =NULL; About                 Else $                 { -                     if(result.) IndexOf (",") != -1 ) -                     { -                          //there are ",", estimated multiple agents. Take the first IP that is not an intranet.  Aresult = result. Replace (" ",""). Replace ("","" ); +                         string[] Temparyip = result. Split (",;". ToCharArray ()); the                          for(inti =0; I < Temparyip. Length; i++ ) -                         { $                             if(Isipaddress (temparyip[i]) the&& Temparyip[i]. Substring (0,3) !="." the&& Temparyip[i]. Substring (0,7) !="192.168" the&& Temparyip[i]. Substring (0,7) !="172.16." ) the                             { -                                 returnTemparyip[i];//find an address that is not an intranet in                             } the                         } the                     } About                     Else if(isipaddress (Result))//Proxy is the IP format the                         returnresult; the                     Else theresult =NULL;//content in Agent non-IP, take IP +                 } -             } the             stringIpAddress = (httpcontext.current.request.servervariables["http_x_forwarded_for"] !=NULL&& httpcontext.current.request.servervariables["http_x_forwarded_for"]! = String.Empty) httpcontext.current.request.servervariables["http_x_forwarded_for"]: httpcontext.current.request.servervariables["REMOTE_ADDR"];Bayi             the             if(NULL= = Result | | result = =String.Empty) theresult = httpcontext.current.request.servervariables["REMOTE_ADDR"]; -             if(Result = =NULL|| result = =String.Empty) -result =HttpContext.Current.Request.UserHostAddress; the             returnresult; the         } the     } the      //whether the IP format -      Public Static BOOLIsipaddress (stringstr1) the     { the         if(str1 = =NULL|| STR1 = =string. Empty | | Str1. Length <7|| Str1. Length > the)return false; the         stringRegformat =@"^\\d{1,3}[\\.] \\d{1,3}[\\.] \\d{1,3}[\\.] \\d{1,3}$";94Regex regex =NewRegex (Regformat, regexoptions.ignorecase); the         returnregex. IsMatch (STR1); the     } the }98}

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C # Get real IP Address implementation method