.netcore 获取请求客户端IP

　　

　　　　　　/// <summary>
        /// 获取客户Ip
        /// </summary>
        /// <param name="context"></param>
        /// <returns></returns>
        public static string GetClientUserIp(this HttpContext context)
        {
            var userHostAddress = context.Request.Headers["X-Forwarded-For"].FirstOrDefault();
            if (string.IsNullOrEmpty(userHostAddress))
            {
                userHostAddress = context.Connection.RemoteIpAddress.ToString();
            }

            //最后判断获取是否成功，并检查IP地址的格式（检查其格式非常重要）
            if (!string.IsNullOrEmpty(userHostAddress) && IsIP(userHostAddress))
            {
                return userHostAddress;
            }
            return "127.0.0.1";
        }
        
        /// <summary>
        /// 检查IP地址格式
        /// </summary>
        /// <param name="ip"></param>
        /// <returns></returns>
        public static bool IsIP(string ip)
        {
            return System.Text.RegularExpressions.Regex.IsMatch(ip, @"^((2[0-4]d|25[0-5]|[01]?dd?).){3}(2[0-4]d|25[0-5]|[01]?dd?)$");
        }

　　在startup.cs中Configure方法，添加如下：

　　　　　　 #region 解决Ubuntu Nginx 代理不能获取IP问题
            app.UseForwardedHeaders(new ForwardedHeadersOptions
            {
                ForwardedHeaders = ForwardedHeaders.XForwardedFor | ForwardedHeaders.XForwardedProto
            });
            #endregion

　　调用方法：

        [HttpPost("publish")]
        public WebApiResult TaskPublish(UserInfo request)
        {

            string ip =GetClientUserIp(HttpContext.Request.HttpContext);