• c#真实IP


    C#如何获取真实IP地址
    大家获取用户IP地址常用的方法是
    
     
    C# 代码   复制
    
      string IpAddress = "";
    
    if((HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]!=null 
    && HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] !=String.Empty) )
    
    {
    
            IpAddress=HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] ;
    
    }
    
    else
    
    { 
    
            HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"]; 
    
    }
    
    
    事实上,上面的代码只试用与用户只使用了1层代理,如果用户有2层,3层HTTP_X_FORWARDED_FOR 的值是:"本机真实IP,1层代理IP,2层代理IP,....." ,如果这个时候你的数据中保存IP字段的长度很小(15个字节),数据库就报错了。 
    
    实际应用中,因为使用多层透明代理的情况比较少,所以这种用户并不多。 
    
     
    
     
    
    获取用户真实IP的方法
    
     
    
     
    C# 代码   复制
    using 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 的摘要说明
        /// </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十进制
        /// </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 ) //没有"."肯定是非IPv4格式
                        result = null;
                    else
                    {
                        if ( result.IndexOf ( "," ) != -1 )
                        {
                             //有",",估计多个代理。取第一个不是内网的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]; //找到不是内网的地址
                                }
                            }
                        }
                        else if ( IsIPAddress ( result ) ) //代理即是IP格式
                            return result;
                        else
                            result = null; //代理中的内容 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 );
        }
    
    
    }
    }

    转载:http://www.cnblogs.com/rr163/archive/2014/10/27/4053054.html

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  • 原文地址:https://www.cnblogs.com/taidi/p/4053550.html
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