Csharp 在C#中反序列化序列化具有混合元素顺序的XML时出现问题

您的XML具有一个包含choice个元素的序列的架构.CHOICE元素表示一组固定的元素之一--<u>、<i>、<yes>、<no>、<unicode>等等--将出现在XML中.XmlSerializer支持Choice Element Binding Support中所述的 Select 元素:

如果单个CHOICE元素的类型与其名称不同，则Xsd.exe仅将XmlElementAttribute个属性应用于公共成员.如果它们只是在名称上不同，则Xsd.exe会应用XmlChoiceIdentifierAttribute，并为做出 Select 添加额外的逻辑.

因此，如第this answer至101节所述，您可以将其建模为一组多态类型，也可以将其建模为一对 Select 类型和值的array.就我个人而言，我认为第一个 Select 更容易，所以我们就这么做吧.

首先定义一些基本类型UientryItem，然后为<uientry>中可能出现的每个元素创建一个与该元素相对应的子类型，通过XmlTypeAttribute.TypeName属性属性来指示名称:

public abstract class UientryItem;

[XmlType("u"), XmlRoot("u")]
public class UientryId : UientryItem
{
    [XmlText] public string Value { get; set; }
}

[XmlType("s"), XmlRoot("s")]
public class UientryTitle : UientryItem
{
    [XmlText] public string Value { get; set; }
}

[XmlType("no"), XmlRoot("no")]
public class UientryNo : UientryItem;

[XmlType("yes"), XmlRoot("yes")]
public class UientryYes : UientryItem;

[XmlType("byte"), XmlRoot("byte")]
public class UientryByte : UientryItem
{
    [XmlText] public byte Value { get; set; }
}

[XmlType("unicode"), XmlRoot("unicode")]
public class UientryUnicode : UientryItem
{
    [XmlText] public string Value { get; set; }
}

[XmlType("i"), XmlRoot("i")]
public class UientryInt : UientryItem
{
    [XmlText] public int Value { get; set; }
}

[XmlType("images"), XmlRoot("images")]
public class UientryImages : UientryItem
{
    [XmlAttribute("count")]
    public int Count { get => Images?.Count?? 0; set { } }

    [XmlElement("image")]
    public List<UientryImage> Images { get; set; } = new();
}

[XmlType("image"), XmlRoot("image")]
public class UientryImage
{
    [XmlElement(typeof(UientryId)), 
     XmlElement(typeof(UientryTitle)),
     XmlElement(typeof(UientryNo)),
     XmlElement(typeof(UientryYes)),
     XmlElement(typeof(UientryByte)),
     XmlElement(typeof(UientryUnicode)),
     XmlElement(typeof(UientryInt)),
     XmlElement(typeof(UientryImages)),
     XmlElement(typeof(UientryStates)),
     XmlElement(typeof(UientryChildren)),
     XmlElement(typeof(UientryAdditionalData))]
    public List<UientryItem> Items { get; set; } = new();
}

[XmlType("states"), XmlRoot("states")]
public class UientryStates : UientryItem
{
    [XmlAttribute("count")] public int Count { get; set; }
    // TODO: fill in appropriate properties
}

[XmlType("children"), XmlRoot("children")]
public class UientryChildren : UientryItem
{
    [XmlAttribute("count")] public int Count { get; set; }
    // TODO: fill in appropriate properties
}

[XmlType("additional_data"), XmlRoot("additional_data")]
public class UientryAdditionalData : UientryItem
{
    [XmlAttribute("type")] public string Type { get; set; }
    // TODO: fill in appropriate properties
}

接下来，Uientry的定义如下:

[XmlType("uientry"), XmlRoot("uientry")]
public class Uientry
{
    [XmlElement(typeof(UientryId)), 
     XmlElement(typeof(UientryTitle)),
     XmlElement(typeof(UientryNo)),
     XmlElement(typeof(UientryYes)),
     XmlElement(typeof(UientryByte)),
     XmlElement(typeof(UientryUnicode)),
     XmlElement(typeof(UientryInt)),
     XmlElement(typeof(UientryImages)),
     XmlElement(typeof(UientryStates)),
     XmlElement(typeof(UientryChildren)),
     XmlElement(typeof(UientryAdditionalData))]
    public List<UientryItem> Items { get; set; } = new();
}

您将能够使用new XmlSerializer(typeof(Uientry))对您的<uientry>进行反序列化，例如:

using var textReader = new StringReader(xmlString);
var serializer = new XmlSerializer(typeof(Uientry));

var uiEntry = (Uientry)serializer.Deserialize(textReader);

并且元素顺序将通过public List<UientryItem> Items { get; set; }列表中的项的顺序来保留.

备注:

• 如果您确定某些元素出现在<uientry>元素的开头或结尾--例如，<additional_data>总是出现在最后--那么您可以使用一个单独的属性来捕获它，就像您在原始的Uientry类中所做的那样.

演示小提琴here.