//多個代理背后的ip地址文件名：IPAddress.csusing System; using System.Data; using System.Configuration; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.Text.RegularExpressions; namespace Common {/// <summary>/// IPAddress 的摘要說明/// </summary> public class IPAddress : System.Web.UI.Page {public static Int64 toDenaryIp ( string ip ){Int64 _Int64 = 0;string _ip = ip;if ( _ip.LastIndexOf ( "." ) > -1 ){string[] _iparray = _ip.Split ( '.' );_Int64 = Int64.Parse ( _iparray.GetValue ( 0 ).ToString() ) * 256 * 256 * 256 + Int64.Parse ( _iparray.GetValue ( 1 ).ToString() ) * 256 * 256 + Int64.Parse ( _iparray.GetValue ( 2 ).ToString() ) * 256 + Int64.Parse ( _iparray.GetValue ( 3 ).ToString() ) - 1;}return _Int64;}/// <summary>/// /ip十進制/// </summary>public static Int64 DenaryIp{get {Int64 _Int64 = 0;string _ip = IP;if ( _ip.LastIndexOf ( "." ) > -1 ){string[] _iparray= _ip.Split ( '.' );_Int64 = Int64.Parse ( _iparray.GetValue ( 0 ).ToString() ) * 256 * 256 * 256 + Int64.Parse ( _iparray.GetValue ( 1 ).ToString() ) * 256 * 256 + Int64.Parse ( _iparray.GetValue ( 2 ).ToString() ) * 256 + Int64.Parse ( _iparray.GetValue ( 3 ).ToString() )-1;}return _Int64;}}public static string IP{get{string result = String.Empty;result = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];if ( result != null && result != String.Empty ){//可能有代理if ( result.IndexOf ( "." ) == -1 ) //沒有"."肯定是非IPv4格式result = null;else{if ( result.IndexOf ( "," ) != -1 ){//有","，估計多個代理。取第一個不是內網的IP。result = result.Replace ( " ", "" ).Replace ( "", "" );string[] temparyip = result.Split ( ",;".ToCharArray() );for ( int i = 0; i < temparyip.Length; i++ ){if ( IsIPAddress ( temparyip[i] )&& temparyip[i].Substring ( 0, 3 ) != "10."&& temparyip[i].Substring ( 0, 7 ) != "192.168"&& temparyip[i].Substring ( 0, 7 ) != "172.16." ){return temparyip[i]; //找到不是內網的地址}}}else if ( IsIPAddress ( result ) ) //代理即是IP格式return result;elseresult = null; //代理中的內容 非IP，取IP}}string IpAddress = ( 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"];if ( null == result || result == String.Empty )result = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];if ( result == null || result == String.Empty )result = HttpContext.Current.Request.UserHostAddress;return result;}}//是否ip格式public static bool IsIPAddress ( string str1 ){if ( str1 == null || str1 == string.Empty || str1.Length < 7 || str1.Length > 15 ) return false;string regformat = @"^\d{1,3}[\.]\d{1,3}[\.]\d{1,3}[\.]\d{1,3}$";Regex regex = new Regex ( regformat, RegexOptions.IgnoreCase );return regex.IsMatch ( str1 );}} }

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