[英]How to serialize/deserialize class-wrapper of IList collection?
I have base class Control
, which contains a property public ControlCollection Controls;
我有
Control
基类,它包含一个public ControlCollection Controls;
的属性public ControlCollection Controls;
: :
public abstract class Control {
...
public virtual string Name { get: set; }
public ControlCollection Controls;
public Control parent = null;
...
}
ControlCollection
is my own class, which implemets IList<Control>
: ControlCollection
是我自己的类,实现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 如果我将
Controls
的属性类型从ControlCollection
更改为List<Control>
,则下面的代码将形成正确的XML文件
// 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: 但是,如果
Controls
的属性类型为ControlCollection
,则XML将被截断:
<?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(typeof(ControlCollection), "Controls", attributes);
我试图更改类型:
attrOverride.Add(typeof(ControlCollection), "Controls", attributes);
, but this doesn't work. ,但这不起作用。
What should I do to serialize ControlCollection
properly? 如何正确序列化
ControlCollection
? And what should I know to properly deserialize it afterwards? 然后我应该知道如何适当地反序列化呢?
Well, I fixed it. 好吧,我修好了。 It turned out that I had a circular reference because of a property
public Control parent = null;
原来我有一个循环引用,因为有一个属性
public Control parent = null;
in my base class. 在我的基础课上。 I wrote an attribute
[XmlIgnore]
and it worked, even with attrOverride.Add(typeof(ControlCollection), "Controls", attributes);
我写了一个属性
[XmlIgnore]
,即使使用attrOverride.Add(typeof(ControlCollection), "Controls", attributes);
,它也可以正常工作attrOverride.Add(typeof(ControlCollection), "Controls", attributes);
The reason why I didn't see this error is that my original project is a Unity project. 我没有看到此错误的原因是我的原始项目是Unity项目。 And Unity didn't show me that error.
而且Unity没有向我显示该错误。 When I made a simple C# Console application - it showed me that error.
当我制作一个简单的C#控制台应用程序时-它向我显示了该错误。 It's sad but true.
这是可悲但真实的。
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