获取客户端自己设置的本地IP地址

private string GetClientIP()
 {
    string 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;
  }
   return result;

 }