获取客户端真实IP

罗分明网络博客 C#类库与方法 4102
首次发布：2017-05-26
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///  <summary>
///  取得客户端真实IP。如果有代理则取第一个非内网地址
///  </summary>
public static string GetIPAddress
{
    get
    {
        var result = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
        if (!string.IsNullOrEmpty(result))
        {
            //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["HTTP_X_REAL_IP"];
 
        if (string.IsNullOrEmpty(result))
            result = HttpContext.Current.Request.ServerVariables["HTTP_X_REAL_IP"];
 
        if (string.IsNullOrEmpty(result))
            result = HttpContext.Current.Request.UserHostAddress;
 
        return result;
    }
}
 
 
///  <summary>
///  判断是否是IP地址格式  0.0.0.0
///  </summary>
///  <param  name="str1">待判断的IP地址</param>
///  <returns>true  or  false</returns>
public static bool IsIPAddress(string str1)
{
    if (string.IsNullOrEmpty(str1) || str1.Length < 7 || str1.Length > 15) return false;
 
    const string regFormat = @"^d{1,3}[.]d{1,3}[.]d{1,3}[.]d{1,3}$";
 
    var regex = new Regex(regFormat, RegexOptions.IgnoreCase);
    return regex.IsMatch(str1);
}