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   string ip =System.Web.HttpContext.Current.Request.UserHostAddress;
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private static string getIp()
 {
     if (System.Web.HttpContext.Current.Request.ServerVariables["HTTP_VIA"] != null)  
      return System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].Split(new char[] { ',' })[0];     
    else 
      return System.Web.HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
 }
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      HTTP_VIA = ûÊýÖµ»ò²»ÏÔʾ
      HTTP_X_FORWARDED_FOR = ûÊýÖµ»ò²»ÏÔʾ
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