public static class Comm
　{
    /// <summary>    /// 获得IP地址    /// </summary>    /// <param name="request"></param>    /// <returns></returns>    public static string GetIPstring(HttpRequest request)    {        // 穿过代理服务器取远程用户真实IP地址        string Ip = string.Empty;        if (request.ServerVariables["HTTP_VIA"] != null)        {            if (request.ServerVariables["HTTP_X_FORWARDED_FOR"] == null)            {                if (request.ServerVariables["HTTP_CLIENT_IP"] != null)                    Ip = request.ServerVariables["HTTP_CLIENT_IP"];                else                    if (request.ServerVariables["REMOTE_ADDR"] != null)                        Ip = request.ServerVariables["REMOTE_ADDR"];                    else                        Ip = "0.0.0.1";            }            else                Ip = request.ServerVariables["HTTP_X_FORWARDED_FOR"];        }        else if (request.ServerVariables["REMOTE_ADDR"] != null)        {            Ip = request.ServerVariables["REMOTE_ADDR"];        }        else        {            Ip = "0.0.0.1";        }        return Ip;    }
}

string str_ip=Comm.GetIPstring(Request);