public SortedDictionary<string, object> FromXml(string xml)

    {

        SortedDictionary<string, object> m_values = new SortedDictionary<string, object>();

        XmlDocument xmlDoc = new XmlDocument();

        xmlDoc.LoadXml(xml);

        XmlNode xmlNode = xmlDoc.FirstChild;//获取到根节点<xml>

        XmlNodeList nodes = xmlNode.ChildNodes;

        foreach (XmlNode xn in nodes)

        {

            XmlElement xe = (XmlElement)xn;

            m_values[xe.Name] = xe.InnerText;//获取xml的键值对到WxPayData内部的数据中

        }

        return m_values;

    }