简单的访客IP获取类-IPHelper.cs

public class IPHelper
{
public static string GetVisitorsIPAddress()
{
string result = String.Empty; result = System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]; // 如果使用代理，获取真实IP
if (result != null && result.IndexOf(".") == -) //没有“.”肯定是非IPv4格式
result = null;
else if (result != null)
{
if (result.IndexOf(",") != -)
{
//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 = ; i < temparyip.Length; i++)
{
if (IsIPAddress(temparyip[i])
&& temparyip[i].Substring(, ) != "10."
&& temparyip[i].Substring(, ) != "192.168"
&& temparyip[i].Substring(, ) != "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
}
if (null == result || result == String.Empty)
result = System.Web.HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"]; if (result == null || result == String.Empty)
result = System.Web.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>
private static bool IsIPAddress(string str1)
{
if (str1 == null || str1 == string.Empty || str1.Length < || str1.Length > ) 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);
}
}