C# xml 转换为实体对象

//xml文件

<?xml version = "1.0" encoding="GB2312" ?>
<DOCUMENT>
    <RETURN_CODE>000000</RETURN_CODE>
        <RETURN_MSG></RETURN_MSG>  
    <QUERYORDER>
        <MERCHANTID>111</MERCHANTID>
        <BRANCHID>222</BRANCHID> 
     </QUERYORDER>
  <QUERYORDER>
        <MERCHANTID>22222</MERCHANTID>
        <BRANCHID>333333</BRANCHID> 
     </QUERYORDER>
</DOCUMENT>

　//实体类

 /// <summary>
    /// 订单查询
    /// </summary> 
    [Serializable]
    [XmlRoot("DOCUMENT")]
    public class ResQueryOrder
    {
        /// <summary>
        /// 交易返回码，成功时总为000000
        /// </summary>
        public string RETURN_CODE { get; set; }
        /// <summary>
        /// 交易返回提示信息，成功时为空
        /// </summary>
        public string RETURN_MSG { get; set; }

        /// <summary>
        /// 订单集合
        /// </summary>     
        [XmlElementAttribute(ElementName = "QUERYORDER")]
        public List<QUERYORDER> QUERYORDER { get; set; }
    }

    /// <summary>
    /// 订单集合
    /// </summary>  
    [Serializable]
    public class QUERYORDER
    {
        /// <summary>
        /// 商户代码
        /// </summary>
        public string MERCHANTID { get; set; }
        /// <summary>
        /// 商户所在分行
        /// </summary>
        public string BRANCHID { get; set; } 
    }

  //调用代码

string xml = System.IO.File.ReadAllText(@"E:\xx.xml");
  ResQueryOrder resQuery = XmlToModel<ResQueryOrder>(xml);

/// <summary>  
/// xml 转换为 model  
/// </summary>  
public static T XmlToModel<T>(string xml)
{
    xml = Regex.Replace(xml, @"<\?xml*.*?>", "", RegexOptions.IgnoreCase);
    XmlSerializer xmlSer = new XmlSerializer(typeof(T));
    using (StringReader xmlReader = new StringReader(xml))
    {
        return (T)xmlSer.Deserialize(xmlReader);
    }
}