WinForm中具有TreeNode公共属性的类如何进行XML序列化？

[Mr.Osc]

环境VS2005+.NET 2.0，代码调试出现“无效操作”异常
代码如下：

[Serializable]
public class TreeNodeSe
{
private TreeNodeSe()
{
this._rootNode = new System.Windows.Forms.TreeNode("Iamroot");
}

private static TreeNodeSe _se = null;
public static Instance()
{
if (_se == null)
{
_se = new TreeNodeSe();
}
return(_se);
}

private string _fileName = "FileName";

private System.Windows.Forms.TreeNode _rootNodeSe;
public System.Windows.Forms.TreeNode RootNode
{
get { return (this._rootNode); }
set { this._rootNode = value; }
}

public void SaveToFile()
{
XmlSerializer xmlS
= new XmlSerializer(typeof(TreeNodeSe));
XmlWriterSettings settings = new XmlWriterSettings();
settings.CheckCharacters = true;
settings.CloseOutput = true;
settings.Indent = true;
settings.NewLineChars = "\r\n";
XmlWriter writer = XmlWriter.Create(this._fileName, settings);

xmlS.Serialize(writer, _se);
writer.Close();
}
}

[Mr.Osc]

MSDN中TreeNode的声明：
[SerializableAttribute]
public class TreeNode : MarshalByRefObject, ICloneable, ISerializable
是否说明TreeNode是可以被序列化的？

[Mr.Osc]

TreeNode.Nodes实现了ICollection接口，但是没有Count属性，是否意味着不能被正确序列化？

[orswanic]

关注……

[Mr.Osc]

在执行到SaveToFile方法建立XmlSerializer时出现异常。。。

[Mr.Osc]

高手来看下哈，怎么连理都不理我啊？