ASP.NET获取用户端的真实IP在各种场景都能用到，但是用户网端变幻莫测情况众多，获取真实IP还真是不容易啊。
下面分享个比较好一点的方法:
获取IP初始版本
/// <summary>
/// 获得当前页面客户端的IP
/// Author:codeo.cn
/// </summary>
/// <returns>当前页面客户端的IP</returns>
public static string GetIP()
{
string result = String.Empty;
result = HttpContext.Current.Request.ServerVariables["HTTP_CDN_SRC_IP"];
if (string.IsNullOrEmpty(result))
result = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"]; if (string.IsNullOrEmpty(result))
result = HttpContext.Current.Request.UserHostAddress; if (string.IsNullOrEmpty(result) || !Utils.IsIP(result))
return "127.0.0.1"; return result;
}
/// <summary>
/// 是否为ip
/// Author:codeo.cn
/// </summary>
/// <param name="ip"></param>
/// <returns></returns>
public static bool IsIP(string ip)
{
return Regex.IsMatch(ip, @"^((2[0-4]\d|25[0-5]|[01]?\d\d?)\.){3}(2[0-4]\d|25[0-5]|[01]?\d\d?)$");
}
改进版获取用户真实IP
/// <summary>
/// 取得客户端真实IP。如果有代理则取第一个非内网地址
/// Author:codeo.cn
/// </summary>
/// <returns></returns>
public static string GetIPAddress()
{
string strresult = string.Empty;
strresult = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
if (strresult != null && strresult != string.Empty)
{
//可能有代理
if (strresult.IndexOf(".") == -) //没有“.”肯定是非IPv4格式
{
strresult = null;
}
else
{
if (strresult.IndexOf(".") != -)
{
//有“,”，估计多个代理。取第一个不是内网的IP。
strresult = strresult.Replace(" ", "").Replace("'", "");
string[] strarrtemparyip = strresult.Split(",;".ToCharArray()); for (int i = ; i < strarrtemparyip.Length; i++)
{
if (IsIPAddress(strarrtemparyip[i]) && strarrtemparyip[i].Substring(, ) != "10." && strarrtemparyip[i].Substring(, ) != "192.168" && strarrtemparyip[i].Substring(, ) != "172.16.")
{
return strarrtemparyip[i]; //找到不是内网的地址
}
}
}
else if (IsIPAddress(strresult)) //代理即是IP格式
{
return strresult;
}
else
{
strresult = null; //代理中的内容 非IP，取IP
}
}
}
string strIpAddress = (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 == strresult || strresult == string.Empty)
{
strresult = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
}
if (strresult == null || strresult == string.Empty)
{
strresult = HttpContext.Current.Request.UserHostAddress;
} return strresult;
}
/// <summary>
/// 判断是否是IP地址格式 0.0.0.0
/// Author:codeo.cn
/// </summary>
/// <param name="strIp">待判断的IP地址</param>
/// <returns>true or false</returns>
private static bool IsIPAddress(string strIp)
{
if (strIp == null || strIp == string.Empty || strIp.Length < || strIp.Length > )
{
return false;
} string strRegformat = @"^d{1,3}[.]d{1,3}[.]d{1,3}[.]d{1,3}___FCKpd___0quot"; Regex regex = new Regex(strRegformat, RegexOptions.IgnoreCase); return regex.IsMatch(strIp);
}