在复杂对象图上使用IXmlSerializable接口

Question

如果使用自定义XML Serialization(IXmlSerialiable),在包含不使用自定义IXmlSerializable接口的组成复杂对象的属性的复杂对象上,如何在IXmlSerializable.ReadXml(XmlReader reader)方法中指定希望反序列化器对这些子属性使用普通反序列化？

注意:类似于这个问题

Answer 1

该IXmlSerializable是有点乏味执行,因为这几乎是给定的,你不能选择子类型普通XML序列化的全有或全无的方式.但是,如果我理解正确,您可以通过手动创建XmlSerializer未实现的类型来实现所需IXmlSerializable.

例如,如果我们从两个类开始Default,那么没有实现IXmlSerializable,Custom哪个实现它.

public class Default // Uses default XML Serialization
{
    public int Count { get; set; }
}

public class Custom : IXmlSerializable
{
    public int Count { get; set; }

    public XmlSchema GetSchema() { throw new NotImplementedException(); }

    public void ReadXml(XmlReader reader)
    {
        reader.ReadToDescendant("Count");
        this.Count = reader.ReadElementContentAsInt();
    }

    public void WriteXml(XmlWriter writer)
    {
        writer.WriteStartElement("Custom");
        writer.WriteElementString("Count", this.Count.ToString());
        writer.WriteEndElement();
    }
}

然后我们创建一个第三个类Parent,它具有前面每个实例的子项,并IXmlSerializable以调用ReadXml/WriteXml支持它的子项的方法的方式实现,并为另一个子项创建默认的XML序列化程序.

public class Parent : IXmlSerializable
{
    public Parent()
    {
        this.Default = new Default { Count = 1 };
        this.Custom = new Custom { Count = 2 };
    }

    public Default Default { get; set; }
    public Custom Custom { get; set; }

    public XmlSchema GetSchema() { throw new NotImplementedException(); }

    public void ReadXml(XmlReader reader)
    {
        reader.ReadToFollowing("Custom");
        this.Custom = new Custom();
        this.Custom.ReadXml(reader);

        reader.ReadToFollowing("Default");
        var serializer = new XmlSerializer(typeof(Default));
        this.Default = (Default)serializer.Deserialize(reader);
    }

    public void WriteXml(XmlWriter writer)
    {
        this.Custom.WriteXml(writer);

        var ns = new XmlSerializerNamespaces();
        ns.Add("", "");
        new XmlSerializer(typeof(Default)).Serialize(writer, this.Default, ns);
    }
}

要使示例完整,请对序列化和反序列化Parent实例的示例程序:

static void Main()
{
    var sb = new StringBuilder();
    var serializer = new XmlSerializer(typeof(Parent));

    serializer.Serialize(new StringWriter(sb), new Parent());

    Console.WriteLine(sb);

    var parent = (Parent)serializer.Deserialize(new StringReader(sb.ToString()));

    Console.WriteLine("Parent.Custom.Count: {0}", parent.Custom.Count);
    Console.WriteLine("Parent.Default.Count: {0}", parent.Default.Count);
}