B/S模式获取客户端IP地址

using System.Web;

namespace Common
{
    public class IPUtil
    {
        /// <summary>
        /// 获取IP地址
        /// </summary>
        /// <returns></returns>
        public string GetClientIP()
        {
            string 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;
        }
    }
}