C# 获得客户端IP

Question

C# 获得客户端IP

Answer 1

   System.Web.HttpContext.Current.Request.UserHostAddress;

Answer 2

if(Context.Request.ServerVariables["HTTP_VIA"]!=null)
{ 
ip=Context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString(); 
}
else
{ 
ip=Context.Request.ServerVariables["REMOTE_ADDR"].ToString(); 
} 

Answer 3

  /// <summary>
        /// 获得当前页面客户端的IP
        /// </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_X_FORWARDED_FOR"];
            if (null == result || result == String.Empty)
            {
                result = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
            }            if (null == result || result == String.Empty)
            {
                result = HttpContext.Current.Request.UserHostAddress;
            }            if (null == result || result == String.Empty || !Utils.IsIP(result))
            {
                return "0.0.0.0";
            }            return result;        }