在DLL中获取客户端的IP和URL

using System;
using System.Collections.Generic;
using System.Net;
using System.Web;

namespace FreeShadow
{
    /// <summary>

    /// 功能说明：在DLL里面获取IP和URL
    /// </summary>
    public class IPAndUrlHelper
    {
        /// <summary>
        /// 获取主机IP
        /// </summary>
        /// <returns></returns>
        public static string GetHostIP()
        {
            string hostIp = string.Empty;

            try
            {
                System.Net.IPAddress[] addressList = Dns.GetHostEntry(Dns.GetHostName()).AddressList;
                foreach (IPAddress ip in addressList)
                {
                    if (ip.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
                    {
                        hostIp = ip.ToString();
                        break;
                    }
                }
                return hostIp;
            }
            catch (Exception)
            {
                return hostIp;
            }
        }

        /// <summary>
        /// 获取客户端IP
        /// </summary>
        /// <returns></returns>
        public static string GetClientIP()
        {
            try
            {
                string result = string.Empty;
                result = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
                if (string.IsNullOrEmpty(result))
                {
                    result = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
                }

                if (string.IsNullOrEmpty(result))
                {
                    result = HttpContext.Current.Request.UserHostAddress;
                }

                return result;
            }
            catch
            {
                return "无法解析IP";
            }
            
        }

        /// <summary>
        /// 获取服务器IP、Mac地址
        /// </summary>
        /// <returns></returns>
        public static List<string> GetHostIPAndMac()
        {
            try
            {
                List<string> list = new List<string>();
                System.Net.IPAddress[] addressList = Dns.GetHostEntry(Dns.GetHostName()).AddressList;
                if (addressList.Length > 1)
                {
                    list.Add(addressList[0].ToString());
                    list.Add(addressList[1].ToString());
                }
                else
                {
                    list.Add(addressList[0].ToString());
                    list.Add("没有可用的连接");
                }

                return list;
            }
            catch (Exception)
            {

                return null;
            }
        }

        /// <summary>
        /// 获取库户端请求的Url
        /// </summary>
        /// <returns></returns>
        public static string GetClientUrl()
        {
            if(HttpContext.Current == null)
            {
                return "无法获取,该日志不是来源于Web";
            }
            try
            {
                string result = HttpContext.Current.Request.Url.ToString();
                if (string.IsNullOrEmpty(result))
                {
                    result = HttpContext.Current.Request.ServerVariables["Path_Info"];
                }

                if (string.IsNullOrEmpty(result))
                {
                    result = HttpContext.Current.Request.UserHostAddress;
                }

                return result;
            }
            catch (Exception)
            {
                return "获取失败";
            }
        }
    }
}