Question

考虑以下类结构

[XmlInclude(typeof(DerivedClass))]
public class BaseClass
{
    public string mem1;
    public string mem2;
}

public class DerivedClass : List<BaseClass>
{
    public string mem3;
    public string mem4;
}

class Program
{
    static void Main(string[] args)
    {
        DerivedClass obj = new DerivedClass();
        obj.mem3 = "test3";
        obj.mem4 = "test4";
        BaseClass base11 = new BaseClass();
        base11.mem1 = "test1";
        base11.mem2 = "test2";
        obj.Add(base11);
        XElement
           .Parse(XMLSerializerUtil.GetXMLFromObject(obj))
           .Save(@"C:\new_settings1.xml");
    }
}

给出的GetXMLFromObject代码在

之下

public static string GetXMLFromObject(object instance)
{
        string retVal = string.Empty;
        if (instance != null)
        {
            XmlSerializer xmlSerializer = new XmlSerializer(instance.GetType());
            using (MemoryStream memoryStream = new MemoryStream())
            {
                xmlSerializer.Serialize(memoryStream, instance);
                memoryStream.Position = 0;
                retVal = new StreamReader(memoryStream).ReadToEnd();
            }
        }
        return retVal;
    }

即使在生成的XML文件中添加XmlInclude属性后，派生的类成员也不存在。

<?xml version="1.0" encoding="utf-8"?>
<ArrayOfBaseClass xmlns:xsd="http://www.w3.org/2001/XMLSchema"   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <BaseClass>
        <mem1>test1</mem1>
        <mem2>test2</mem2>
    </BaseClass>
</ArrayOfBaseClass>

请告诉我，在生成的XML文件中包含派生类成员所缺少的内容。

Answer 1

问题在于：

DerivedClass : List<BaseClass>

对于XmlSerializer，项目列表 exclusive-or 一个实体。如果它看起来像一个列表，那么仅列表项被序列化; “list”本身的成员未序列化。基本上，不要这样做。封装列表而不是从列表中派生：

另请注意，[XmlInclude(...)]会期望DerivedClass : BaseClass。所以，像：

public class SomeType // note DOES NOT INHERIT
{
    private readonly List<SomeOtherType> items = new List<SomeOtherType>();
    public List<SomeOtherType> Items { get { return items; } }
    [XmlElement("mem3")] public string Mem3 {get;set;}
    [XmlElement("mem4")] public string Mem4 {get;set;}
}

public class SomeOtherType
{
    [XmlElement("mem1")] public string Mem1 {get;set;}
    [XmlElement("mem2")] public string Mem2 {get;set;}
}

xml序列化基类列表

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