如何使用XmlSerializer将字符串序列化为CDATA？

[XmlRoot("root")]public class Sample1Xml{    internal Sample1Xml()    {    }    [XmlElement("node")]    public NodeType Node { get; set; }    #region Nested type: NodeType    public class NodeType    {        [XmlAttribute("attr1")]        public string Attr1 { get; set; }        [XmlAttribute("attr2")]        public string Attr2 { get; set; }        [XmlIgnore]        public string Content { get; set; }        [XmlText]        public XmlNode[] CDataContent        { get {     var dummy = new Xmldocument();     return new XmlNode[] {dummy.CreateCDataSection(Content)}; } set {     if (value == null)     {         Content = null;         return;     }     if (value.Length != 1)     {         throw new InvalidOperationException(  String.Format(      "Invalid array length {0}", value.Length));     }     Content = value[0].Value; }        }    }    #endregion}