C#如何获取真实IP地址

2020-12-13 13:42

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大家获取用户IP地址常用的方法是

 
C# 代码   复制
soscw.com,搜素材string IpAddress = "";
soscw.com,搜素材soscw.com,搜素材if((HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]!=null 
soscw.com,搜素材&& HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] !=String.Empty) )
soscw.com,搜素材soscw.com,搜素材{
soscw.com,搜素材soscw.com,搜素材        IpAddress=HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] ;
soscw.com,搜素材soscw.com,搜素材}
soscw.com,搜素材soscw.com,搜素材else
soscw.com,搜素材soscw.com,搜素材{ 
soscw.com,搜素材soscw.com,搜素材        HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"]; 
soscw.com,搜素材soscw.com,搜素材}
soscw.com,搜素材


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
soscw.com,搜素材using System;
soscw.com,搜素材using System.Data;
soscw.com,搜素材using System.Configuration;
soscw.com,搜素材using System.Web;
soscw.com,搜素材using System.Web.Security;
soscw.com,搜素材using System.Web.UI;
soscw.com,搜素材using System.Web.UI.WebControls;
soscw.com,搜素材using System.Web.UI.WebControls.WebParts;
soscw.com,搜素材using System.Web.UI.HtmlControls;
soscw.com,搜素材using System.Text.RegularExpressions;
soscw.com,搜素材namespace Common
soscw.com,搜素材{
soscw.com,搜素材/// 
soscw.com,搜素材/// IPAddress 的摘要说明
soscw.com,搜素材/// soscw.com,搜素材public class IPAddress : System.Web.UI.Page
soscw.com,搜素材{
soscw.com,搜素材soscw.com,搜素材public static Int64 toDenaryIp ( string ip )
soscw.com,搜素材{
soscw.com,搜素材        Int64 _Int64 = 0;
soscw.com,搜素材string _ip = ip;
soscw.com,搜素材if ( _ip.LastIndexOf ( "." ) > -1 )
soscw.com,搜素材{
soscw.com,搜素材string[] _iparray = _ip.Split ( . );
soscw.com,搜素材soscw.com,搜素材            _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;
soscw.com,搜素材        }
soscw.com,搜素材return _Int64;
soscw.com,搜素材    }
soscw.com,搜素材soscw.com,搜素材/// 
soscw.com,搜素材/// /ip十进制
soscw.com,搜素材/// soscw.com,搜素材    public static Int64 DenaryIp
soscw.com,搜素材{
soscw.com,搜素材get {
soscw.com,搜素材            Int64 _Int64 = 0;
soscw.com,搜素材soscw.com,搜素材string _ip = IP;
soscw.com,搜素材if ( _ip.LastIndexOf ( "." ) > -1 )
soscw.com,搜素材{
soscw.com,搜素材string[] _iparray= _ip.Split ( . );
soscw.com,搜素材soscw.com,搜素材                _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  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 );
    }


}
}

C#如何获取真实IP地址

标签:http   io   os   ar   使用   for   strong   sp   数据   

原文地址:http://www.cnblogs.com/rr163/p/4053054.html


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