How to serialize/deserialize class-wrapper of IList collection?

[i-programmer]

I have base class Control, which contains a property public ControlCollection Controls:


public abstract class Control {
...
public virtual string Name { get: set; }
public ControlCollection Controls;
...
}


ControlCollection is my own class, which implements IList<Control>:

public sealed class ControlCollection : IList<Control>, IMySerializable {
public int Count => _controls.Count;
public bool IsReadOnly { get; } = false;
public Control Parent;

private List<Control> _controls = new List<Control>();

public ControlCollection(Control parent) {
Parent = parent ?? throw new ArgumentNullException("parent");
}

public Control this[int index] {
get => _controls[index];
set => _controls[index] = value;
}

public void Add(Control child) {
child.parent = Parent;
_controls.Add(child);
}

...
}


If I change a type of property Controls from ControlCollection to List<Control>, then code below will form a correct XML file

// temp data
Control rootObj = new Button(); rootObj.Name = "111";
Control obj2 = new Label(); obj2.Name = "222";
Control obj3 = new Button(); obj3.Name = "333";
rootObj.Controls.Add(obj2);
rootObj.Controls.Add(obj3);

List<Type> list = new List<Type>();
rootObj.Controls.ForEach(child => child.DoActionWithChildren(node => {
list.Add(node.GetType());
}));

list.Add(typeof(Button));
list = list.Distinct().ToList();

// trying to set xml attributes. 'Controls' property will be a root of collection
var attributes = new XmlAttributes();
list.ForEach(t => attributes.XmlArrayItems.Add(new XmlArrayItemAttribute(t)));
var attrOverride = new XmlAttributeOverrides();
attrOverride.Add(typeof(Control), "Controls", attributes);

// save data to file
using(StreamWriter sw = new StreamWriter("path/to/xml/file.xml", false, Encoding.UTF8)) {
XmlSerializer xs = new XmlSerializer(typeof(Control), attrOverride);
XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
ns.Add(string.Empty, string.Empty);
xs.Serialize(sw, rootObj, ns);
}

/* ---------------------- */
output:

<?xml version="1.0" encoding="utf-8"?>
<Control d1p1:type="Button" xmlns:d1p1="http://www.w3.org/2001/XMLSchema-instance">
<Controls>
<Control d1p1:type="Label">
<Controls />
<Name>22222</Name>
</Control>
<Control d1p1:type="Button">
<Controls />
<Name>32333</Name>
</Control>
</Controls>
<Name>1111</Name>
</Control>


But if a type of property Controls is ControlCollection, then XML will be cut off:

<?xml version="1.0" encoding="utf-8"?>
<Button>
<Controls>
<Control d3p1:type="Label" xmlns:d3p1="http://www.w3.org/2001/XMLSchema-instance">
<Controls />

I tried to change the type: attrOverride.Add(<g class="gr_ gr_24 gr-alert gr_spell gr_inline_cards gr_run_anim ContextualSpelling" data-gr-id="24" id="24">typeof</g>(ControlCollection), "Controls", attributes), but this doesn't work.

What should I do to serialize ControlCollection properly? And what should I know to properly deserialize it afterward?

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